date:20091104


 App Engine's DataNucleus plugin doesn't support the setCandidates method

Jason/Max, DataNucleus can do all of that for you, I'm sure I've
mentioned this before.
Here I'll even donate you some code that you can plug into your
JDOQLQuery.performExecute() method

code
if (candidateCollection != null)
{
// Supplied collection of instances, so evaluate in-memory
if (candidateCollection.isEmpty())
{
return Collections.EMPTY_LIST;
}
else
{
ClassLoaderResolver clr = om.getClassLoaderResolver();
List candidates = new ArrayList(candidateCollection);
JavaQueryEvaluator resultMapper = new JDOQLEvaluator
(this, candidates, compilation,
parameters, clr);
return resultMapper.execute(true, true, true, true,
true);
}
}
/code

So the query will be executed in memory using the user-supplied
instances.

No excuses now ;-)

--Andy (DataNucleus)
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[appengine-java] Jdo: detaching objects vs. merging transient objects

2009-11-04 Thread a.maza


I've used the merging of transient objects approach for a while as
described in 
http://timepedia.blogspot.com/2009/04/google-appengine-and-gwt-now-marriage.html
and it works quite fine. I only subsituted the proposed implementation
of copying fields by dozer.

However, I am still thinking to move to the detaching objects
approach and played around with it a bit. So far, the detaching
objects approachs seems more cumbersome to me...

I would be happy to hear some thoughts...

regards,
andr
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[appengine-java] Re: thanking uuuuuuuuu

2009-11-04 Thread Ashen


here u can find Netbeans plugin for App Engine
http://kenai.com/projects/nbappengine/pages/NBInstall

On Nov 3, 5:52 pm, raju k alias (billa) oxfordr...@gmail.com
wrote:
 Thank for the java version

 Is there any plugin for netbeans IDE
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[appengine-java] App engine layout - servers around the world?

2009-11-04 Thread barak


I was wondering - say a user from South Africa and a user from the U.S
hits a webapp deployed on GAE. Do those users expirience the same
speed of loading the site, downloaing images, etc., or GAE servers
located in one data center (for example, California), and the
nearest users will enjoy from faster download?

Thanks.
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[appengine-java] Re: UnsupportedDatastoreFeatureException

2009-11-04 Thread IlyaE


If i change my authenticate filter to
query.setFilter(ContactInfo.email == emailParam  password ==
passwordParam);

I now get this error.
javax.jdo.JDOUserException: Identifier ContactInfo.email is unresolved
(not a static field)




On Nov 3, 9:32 pm, Max Ross (Google) maxr+appeng...@google.com
wrote:
 Andy has pinpointed the issue.  You most likely don't have a field on your
 MyUser class named email but the error isn't being triggered on the first
 query because your second call to setFilter() is overwriting the reference
 to the nonexistent field.  You'll need to pass the entire filter to
 setfilter() and you most likely want 'contactInfo.email' instead of 'email'

 Hope this helps,
 Max
 On Tue, Nov 3, 2009 at 12:00 PM, datanucleus andy_jeffer...@yahoo.comwrote:





  Multiple calls to setFilter will overwrite the previous value. Do you
  really want to do that?
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[appengine-java] Re: Master/Detail relations and redundant data handling


Why is BookFK trying to use Datastore Identity ? (as the message says)

identityType=IdentityType.APPLICATION would be recommended
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[appengine-java] Re: UnsupportedDatastoreFeatureException

2009-11-04 Thread IlyaE


Ok i figured it out now. I was trying to refer to the classname
ContactInfo in my filter rather than the object name in my User class
contactInfo. The difference in case for the leading 'C' was the
culprit.

On Nov 4, 10:19 am, IlyaE ilyaelk...@gmail.com wrote:
 If i change my authenticate filter to
                 query.setFilter(ContactInfo.email == emailParam  password 
 ==
 passwordParam);

 I now get this error.
 javax.jdo.JDOUserException: Identifier ContactInfo.email is unresolved
 (not a static field)

 On Nov 3, 9:32 pm, Max Ross (Google) maxr+appeng...@google.com
 wrote:



  Andy has pinpointed the issue.  You most likely don't have a field on your
  MyUser class named email but the error isn't being triggered on the first
  query because your second call to setFilter() is overwriting the reference
  to the nonexistent field.  You'll need to pass the entire filter to
  setfilter() and you most likely want 'contactInfo.email' instead of 'email'

  Hope this helps,
  Max
  On Tue, Nov 3, 2009 at 12:00 PM, datanucleus 
  andy_jeffer...@yahoo.comwrote:

   Multiple calls to setFilter will overwrite the previous value. Do you
   really want to do that?
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[appengine-java] Re: Java namespace for entity in bulkloader?


Maybe I didn't word my problem very well.

Let me describe it again:

Data push:
1. I am bulkloading data to an app using python appcfg and custom
bulkloaders.
2. The custom bulk loaders are pushing data from a CSV.
3. The models of the data being pushed have simple names in python (no
package namespace)
4. The entities all get successfully uploaded.

Data query:
1. The application that uses the data pushed via bulk loading is in
Java
2. Because it's in Java, there is a package namespace for where my
entity classes exist
3. App Engine is supposed to ignore the long package namespace and
just pick up the simple name (ie, the name of the class)
4. These simple names are supposed to match the simple names of the
data that was pushed via bulk loading.

The problem:
1. Queries for the simple name via the admin interface return data as
expected
2. Queries for the simple name via Java code do NOT return data as
expected. Instead I get a JDO error about the class not being found
(sorry, don't have my code in front of me to list the trace).
Basically, it seems that a query for a simple name throws an error
when that simple class name exists in a fully named package.

I am using JDO annotations in my classes as per the tutorials. Is
there some magic that I am missing? Perhaps I am doing something wrong
with my annotations?

I would rather post details, but wanted to get a handle on the general
problem before I bog down the list with a stack trace and entity code.

Stuart

On Nov 3, 5:06 pm, Stuart Moffatt stuartmoff...@gmail.com wrote:
 I am using Nick's excellent tutorials on bulk loading, and was able to
 push a huge pile of entities up to production. Problem is, they looked
 like this:

 MySpecialEntity

 in my custom python bulkloader class and in production.

 The gotcha is my application is Java, and queries for:

 SELECT FROM org.domain.app.MySpecialEntity

 fail because the Javanamespacewas not part of the python bulkloader.

 Anyone know a workaround?

 Stuart
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[appengine-java] Re: Master/Detail relations and redundant data handling

2009-11-04 Thread James H


BookFk is an embedded class intended to be used by entities like
Chapter and others.  It is NOT intended to be a standalone entity or
have a Primary Key.  So, when I try your fix I get the following
compile error:

SEVERE: Class struts2.example4.BookFk has application-identity and no
objectid-class specified yet has 0 primary key fields. Unable to use
SingleFieldIdentity.

This pattern was submitted by Bryce as a way of better handling
redundant data related to FK fields such as Chapter.book in this case.

On Nov 4, 10:59 am, datanucleus andy_jeffer...@yahoo.com wrote:
 Why is BookFK trying to use Datastore Identity ? (as the message says)

 identityType=IdentityType.APPLICATION would be recommended
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[appengine-java] Re: Problem deploying app - Version not ready

2009-11-04 Thread JedIrv


Thanks, Jason.  Indeed it did work when I tried it yesterday, though
my recollection is that I tried it a few times over a couple of days
last week, so it gave the impression of something less transient going
on.  But, indeed it works now!

Thanks,

Jed

On Nov 2, 3:10 pm, Jason (Google) apija...@google.com wrote:
 Hi Jed. There was some deployment latency late last week, but this didn't
 last very long, and everything should be up and running smoothly. Please let
 me know if you continue to see this error and make sure to provide your
 application ID in future posts.

 - Jason

 On Thu, Oct 29, 2009 at 4:04 PM, JedIrv jed...@gmail.com wrote:

  Hello,

  I'm in my first days of experimenting with Google App Engine and am
  getting an error when I try to deploy using the eclipse plugin.  My
  initial deploy went smoothly a couple of days ago, and several updates
  as well, but trying to redeploy now, I see the console output indicate
  some sort of connection issue develops:

  .
  .
  .
  Deploying new version.
  Will check again in 1 seconds.
  Will check again in 2 seconds.
  ...(falls back to waiting twice as long until it gets to 128)...
  Will check again in 128 seconds.
  Rolling back the update.
  javaj.lang.RuntimeException:  Version not ready.

  the stack trace in the log has this:

  Unable to update:
  java.lang.RuntimeException: Version not ready.
     at com.google.appengine.tools.admin.AppVersionUpload.commit
  (AppVersionUpload.java:361)
     at com.google.appengine.tools.admin.AppVersionUpload.doUpload
  (AppVersionUpload.java:114)
     at com.google.appengine.tools.admin.AppAdminImpl.update
  (AppAdminImpl.java:56)
     at
  com.google.appengine.eclipse.core.proxy.AppEngineBridgeImpl.deploy
  (AppEngineBridgeImpl.java:271)
     at
  com.google.appengine.eclipse.core.deploy.DeployProjectJob.runInWorkspace
  (DeployProjectJob.java:148)
     at org.eclipse.core.internal.resources.InternalWorkspaceJob.run
  (InternalWorkspaceJob.java:38)
     at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

  yet, my admin console log page indicates the update went ok (or at
  least no problem is indicated).  Checking the url reveals the update
  did not succeed.

  Any help would be greatly appreciated!

  Jed
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[appengine-java] Re: Master/Detail relations and redundant data handling


 BookFk is an embedded class intended to be used by entities like
 Chapter and others.

Needs a PK either way. Pick a field, any field.
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[appengine-java] Re: Master/Detail relations and redundant data handling


 Needs a PK either way. Pick a field, any field.

Or just set embeddedOnly as true ... if you really never want to
persist one of those in its own right
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[appengine-java] Re: JSF 1.2 - Session-scoped managed Bean not Behaving as Expected

2009-11-04 Thread 软件梦工厂


I have the same problem with JSF 2.0,and I am looking for some
solutions ,too.

On Sep 5, 11:52 am, Traveler1980 jshar...@gmail.com wrote:
 Hi All,

 I recently upgraded an app that I'm working on from MyFaces 1.1.6 to
 JSF (Mojarra) 1.2_13 with Facelets.  I used the jars (el and jsf) from
 this example --http://code.google.com/p/jsfongap/

 Everything is working fine when running my app locally; however, when
 I deploy,session-scoped managed beans are being recreated on every
 page turn - almost as if they are request-scoped.

 To give a simple example, let 's say I have this bean defined in faces-
 config:
 managed-bean
                 managed-bean-nameuser/managed-bean-name
                 managed-bean-classfoo.bar.User/managed-bean-class
                 managed-bean-scopesession/managed-bean-scope
 /managed-bean

 And the bean is used on page 1 of an application as follows:
 h:inputText id=firstName value=#{user.firstName} style= /

 And the value is then output on a second page like:  h:outputText
 value=#{user.firstName}/

 Regardless of what I type on the first page, the value is not retained
 and displayed on the second page.  I did a simple test where I logged
 user.toString().  I expected the output from toString() to be the same
 for the entiresession.  My expectation was met on my development
 server, but when deployed I saw this:

 First Page submit -
 09-04 08:44PM 37.206
 foo.bar.actions.impl.UserAction execute: foo.bar.u...@1515d5c

 Second Page Submit -
 09-04 08:44PM 46.579
 foo.bar.actions.impl.UserAction execute: foo.bar.u...@60999e

 Big surprise.  Different objects!!  In fact, a new instance of User is
 created for every page turn.

 Has anyone else noticed this odd behavior?  Is it possible that I've
 missed something?  I will probably end up going back to MyFaces 1.1.

 Thanks in advance for the help.
 Jamie

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[appengine-java] problem with using session.getAttribute()

2009-11-04 Thread gaurav


in my application a servlet stores the user's details when she starts
with the application as follows

User user=new User();
HttpSession session=req.getSession();
user.setUser(userName);
user.setRole(user);
session.setAttribute(user, user);
RequestDispatcher rd=req.getRequestDispatcher(/HomePage.jsp);
rd.forward(req, resp);

After this servlet stored the User object in session, every jsp in the
application receives the User object from session using a helper class

public class UserIdentifier
{
public static String getUser(HttpServletRequest req)
{
HttpSession session=req.getSession(false);
User userObj=(User)session.getAttribute(user);
String role=userObj.getRole(); // HERE IS THE ERROR
String user=null;
if(role.equals(admin))
{
user=(String)session.getAttribute(user2);
if(user==null)
{
return null;
}
}
if(role.equals(user))
{
user=userObj.getUser();
}
return user;
}
}

The User class is serializable and sessions-enabledtrue/sessions-
enabled is present in appengine-web.xml

it works fine on my local machine but when i deployed to app engine,
it throws a nullpointer exception on the line where i called
userObj.getRole();
it indicates that userObj is null,  i dont understand why it is not
able to pick the User object from the session


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[appengine-java] Cron job fired up twice

2009-11-04 Thread Stefan Roman


Hi All,

My crontab is defined in the following way:

?xml version=1.0 encoding=UTF-8?
cronentries
  cron
url/cron/sendnotifs/url
descriptionSend notification at 9 every Mon, Tue, Wed, Thu, Fri/
description
scheduleevery mon,tue,wed,thu,fri 09:00/schedule
timezoneEurope/Sarajevo/timezone
  /cron
  cron
url/cron/sendnotifs/url
descriptionSend notification at 10 every Sat, Sun/description
scheduleevery sat,sun 10:00/schedule
timezoneEurope/Sarajevo/timezone
  /cron
/cronentries

The problem is that it is fired up twice. Unfortunately I don't know
how big is the problem because I don't receive notifications every
time when cron hits the /cron/sendnotifs URL, but if the conditions
for notification in my app are met, I receive two notifications. That
leads me to the conclusion that cron was started twice.

Today, cron was executed at 9 as it suppouse to, and at 09:05:09.

Where is the problem? Am I missing something?

Thanks in advance for any help.

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[appengine-java] How to use JSON on server-side?

2009-11-04 Thread Nguyễn Kim Kha


I'm newbie...

I want to use JSON on server-side to do something... But I can't...

Please help me!

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[appengine-java] Recommended scope for DatastoreService

2009-11-04 Thread Roy


Should I be creating a DatastoreService for each session, or are
they inexpensive enough that I can have one for each Kind? I realise
that for transactions, the latter doesn't work.

A related question is how threadsafe is an instance of
DatastoreService?


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[appengine-java] Cannot retrieve value of the newly created attribute in a JDO

2009-11-04 Thread delightwjk


Hi All,

I created a JDO class, which had some attributes, and I created some
CRUD operations, all of them worked correctly.

Then I added a new attribute in the JDO class, and then set value to
it and persisted it as usual when I executed CRUD operations. The
problem is that I cannot retrieve the value of the new attribute in
program, the value is always null. But when I check the value in
Datastore - Data Viewer, the value is correct. So i'm wondering
why it cannot be retrieved in application. Is there some cache
mechanism?

Thanks in advance!
Jiakuan

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[appengine-java] Re: does usage of buffered writer in servlet make sense

If you're calling print or println many times in your servlet, then it makes
sense, although the resource savings you net may not be significant.

In general, it's acceptable to use the default PrintWriter.

- Jason

On Mon, Nov 2, 2009 at 7:18 AM, Raphael André Bauer 
raphael.andre.ba...@gmail.com wrote:


 hey,


 i am wondering if it makes sense to wrap the printwriter of a servlet
 into a bufferedwriter. depending on the underlaying implementation
 that can make sense imho, but i am not sure about the google app
 engine... any recommendations?


 thanks!


 raphael

 


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[appengine-java] Re: PDF Generator Library

Great news, Eugene! Can you please submit it to the open source projects
page by following the instructions at the bottom of
http://groups.google.com/group/google-appengine/web/google-app-engine-open-source-projects
?

- Jason

On Sun, Nov 1, 2009 at 8:55 PM, edragoev drag...@gmail.com wrote:

Hello Jason,

I took Francois tweaks and also added support for PNG files that
doesn't depend on the AWT classes.

We have new GAE compatible Open Source version now:

http://pdfjet.com/os/download.html

Best Regards,

Eugene

P.S. The PNG decoder I wrote currently supports Truecolor PNG files
with Bit Depth 8 and paletted PNG files with Bit Depth 4 and 8.
Currently there is no support for grayscale images. If there is
interest we may add support for more types of PNG files and possibly
GIF support.

On Oct 7, 4:14 pm, Jason (Google) apija...@google.com wrote:
Hi mably. Can you describe the tweaks you need to make in more detail?
I'd
like to add this to the Will it play in App Engine page.

Thanks,
- Jason

On Tue, Oct 6, 2009 at 6:44 AM, mably fm2...@mably.com wrote:

The PDFJet library seems to works fine on GAE after a few tweaks to
replace files by streams.

It's a quite low-level library but should be ok for simple tasks.

http://www.pdfjet.com/os/edition.html

On 28 sep, 19:09, Jason (Google) apija...@google.com wrote:
You're correct. As far as I know, no one has been able to use
JasperReports
within App Engine because of the reliance on iText which in turn
requires
several AWT classes that aren't currently on the JRE class white
list.

- Jason

On Thu, Sep 24, 2009 at 10:12 AM, mably fm2...@mably.com wrote:

Are you sure that JasperReports works fine on GAE ?

I thought it was using iText which doesn't seem to run on GAE (it
needs an unsupported patch).

Mian Rashid a écrit :
Use can use Jasper Report and there is also designer tool
available
for that is IReport.

On Sep 23, 6:57 pm, mably fm2...@mably.com wrote:
Does anybody know of a java PDF generator library working with
Google
App Engine ? Even a low-level one.

Any help would be greatly appreciated.

Thanx in advance.

Francois
Bordeaux, FRANCE

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[appengine-java] Re: Problem with using Federated Login (OpenID + OAuth)

Hi Pradheep. The library that you are using is attempting to spawn a new
thread which is not permitted by App Engine's sandbox. You will have to
either disable multithreading via configuration, if the library exposes
this, or use another library.

The Google Accounts API that is referenced in the paragraph that you
quoted from our documentation is referring to the Google Accounts service
that App Engine exposes:

http://code.google.com/appengine/docs/java/users/

This App Engine API only returns the user's nickname and email address,
however, so you'll need to use a different mechanism if other profile
information is necessary.

- Jason

On Sun, Nov 1, 2009 at 8:24 PM, Pradheep A R pradheep@gmail.com wrote:



  Hello everyone,

  I am sure i am asking something that some one here knows the answer.

  I am trying to implement the OpenID client to authenticate my users
 in
  the Google App Engine website and then use Google Accounts API to
  access their profile (All i want is to show their profile pics, show
  their contacts when they want to notify some information to their
  friends when they use my websitewww.letsvoteonline.com)
  I am using OpenID for Java library for this purpose. The problem here
  is i am getting the following exception.

  java.security.AccessControlException: access denied
  (java.lang.RuntimePermission modifyThreadGroup)
 at java.security.AccessControlContext.checkPermission(Unknown
 Source)
 at java.security.AccessController.checkPermission(Unknown
 Source)
 at java.lang.SecurityManager.checkPermission(Unknown Source)
 at com.google.appengine.tools.development.DevAppServerFactory
  $CustomSecurityManager.checkPermission(DevAppServerFactory.java:151)
 at com.google.appengine.tools.development.DevAppServerFactory
  $CustomSecurityManager.checkAccess(DevAppServerFactory.java:176)
 at java.lang.ThreadGroup.checkAccess(Unknown Source)
 at java.lang.Thread.init(Unknown Source)
 at java.lang.Thread.(Unknown Source)
 at
 org.apache.commons.httpclient.MultiThreadedHttpConnectionManager
  $ReferenceQueueThread.(MultiThreadedHttpConnectionManager.java:1039)
 at

 org.apache.commons.httpclient.MultiThreadedHttpConnectionManager.storeRefer
 enceToConnection
  (MultiThreadedHttpConnectionManager.java:164)
 at

 org.apache.commons.httpclient.MultiThreadedHttpConnectionManager.access
  $900(MultiThreadedHttpConnectionManager.java:64)
 at
 org.apache.commons.httpclient.MultiThreadedHttpConnectionManager
  $ConnectionPool.createConnection
  (MultiThreadedHttpConnectionManager.java:750)
 at

 org.apache.commons.httpclient.MultiThreadedHttpConnectionManager.doGetConne
 ction
  (MultiThreadedHttpConnectionManager.java:469)
 at

 org.apache.commons.httpclient.MultiThreadedHttpConnectionManager.getConnect
 ionWithTimeout
  (MultiThreadedHttpConnectionManager.java:394)
 at
 org.apache.commons.httpclient.HttpMethodDirector.executeMethod
  (HttpMethodDirector.java:152)
 at org.apache.commons.httpclient.HttpClient.executeMethod
  (HttpClient.java:396)
 at org.apache.commons.httpclient.HttpClient.executeMethod
  (HttpClient.java:324)
 at org.openid4java.util.HttpCache.head(HttpCache.java:296)
 at
 org.openid4java.discovery.yadis.YadisResolver.retrieveXrdsLocation
  (YadisResolver.java:360)
 at org.openid4java.discovery.yadis.YadisResolver.discover
  (YadisResolver.java:229)
 at org.openid4java.discovery.yadis.YadisResolver.discover
  (YadisResolver.java:221)
 at org.openid4java.discovery.yadis.YadisResolver.discover
  (YadisResolver.java:179)
 at org.openid4java.discovery.Discovery.discover
 (Discovery.java:134)
 at org.openid4java.discovery.Discovery.discover
 (Discovery.java:114)
 at org.openid4java.consumer.ConsumerManager.discover
  (ConsumerManager.java:527)
 at letsvote.webapps.Letsvote_test1Servlet.authRequest
  (Letsvote_test1Servlet.java:170)
 at letsvote.webapps.Letsvote_test1Servlet.doGet
  (Letsvote_test1Servlet.java:93)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:
 693)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:
 806)
 at org.mortbay.jetty.servlet.ServletHolder.handle
 (ServletHolder.java:
  487)
 at org.mortbay.jetty.servlet.ServletHandler
 $CachedChain.doFilter
  (ServletHandler.java:1093)
 at
  com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter
  (TransactionCleanupFilter.java:43)
 at org.mortbay.jetty.servlet.ServletHandler
 $CachedChain.doFilter
  (ServletHandler.java:1084)
 at
 com.google.appengine.tools.development.StaticFileFilter.doFilter
  (StaticFileFilter.java:121)
 at org.mortbay.jetty.servlet.ServletHandler
 $CachedChain.doFilter
  (ServletHandler.java:1084)
 at org.mortbay.jetty.servlet.ServletHandler.handle
  (ServletHandler.java:360)

[appengine-java] Re: error 500 from server when starting the guestbook demo app

It looks like your system may not have Java configured correctly or
otherwise can't invoke the javac compiler needed to compile your
application.

java.io.IOException: Cannot run program javac.exe: CreateProcess error=2

You may want to search the web for similar error messages, which might help
you determine the source of the issue. Are you using the Eclipse plugin or
the command line to start your app?

- Jason

On Mon, Nov 2, 2009 at 11:18 AM, Tomas tomasep...@gmail.com wrote:


 Hi I'm Tomas  - a newbe.

 I get error 500 from server when trying a demo application to
 according to instructions:
 http://code.google.com/appengine/docs/java/gettingstarted/installing.html
 Response from localserver:8080 look here:

 http://docs.google.com/Doc?docid=0Afhb3u6SCF24ZGN2cjN2cTNfM2ZwODkyN2Yyhl=en

 what' wrong?

 


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[appengine-java] Re: Master/Detail relations and redundant data handling

2009-11-04 Thread James H


Datanucleus, both suggestions worked but I like the embeddedOnly
best in order to avoid a dummy key on every FK class!

Bryce, I no longer get the error above...I just added
embeddedOnly=true to the PersistanceCapable tag in BookFk class.
You're right, I could use the collection technique on the FKs but I
wonder the pros/cons of such collections on what could be very large
collections.  For example, say Baylor with 25,000 members?  Guess its
a matter of using owned for small Sets versus unowned for large
Sets of data.  Regardless, your FK pattern will save a whole lot of
code management!!!

Any further feedback welcome...I'll continue testing!

On Nov 4, 12:12 pm, datanucleus andy_jeffer...@yahoo.com wrote:
  Needs a PK either way. Pick a field, any field.

 Or just set embeddedOnly as true ... if you really never want to
 persist one of those in its own right
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[appengine-java] Re: App Engine Refactoring / Adaptable Design

Unfortunately, the solution I proposed does not allow for adding additional
filters when querying for all Campaigns with FundingOganization ABC. If
this is a requirement, you'll have to consider several options -- either
doing the filtering in memory, which is reasonable if you only expect a
handful of matched Campaigns, or including the criterion field in the table
so you can query on it directly, which may muddle your schema.

Since App Engine's datastore doesn't support joins, most data models won't
be completely normalized, which probably feels strange if you're coming from
the RDBMS mindset. But storage is cheap and you can usually ignore the added
redundancy if the data fields in question are not expected to change often.

- Jason

On Mon, Nov 2, 2009 at 3:27 PM, Hans gcbo...@gmail.com wrote:


 thanks Jason - I'll need to think more about how this would work in my
 case.

 It sounds like I'll be able to query that new kind (return all the
 Campaign keys for a FundingOrganization of ABC) to get a collection
 of keys. But then if I wanted to extract only the entities from that
 result that meet certain criteria (Campaign.Duration  30) , I'll need
 to do that outside of the query language.

 I'm sure my questions reflect a newness to OOD. I do appreciate your
 response.

 Hans

 On Nov 2, 3:27 pm, Jason (Google) apija...@google.com wrote:
  Hi Hans. Aside from the article on modeling entity relationships and the
 JDO

 ...

 
  It sounds like you want to add a new kind (as opposed to a new property
 for
  an existing kind) and establish a relationship with this new kind
  (FundingOrganization) and an existing kind (Campaign). For many-to-many
  relationships such as this, one approach you can take is similar to what
 you
  might do for an RDBMS schema: introduce a new table (kind) to model the
  relationship between FundingOrganization and Campaign entities. This
 third
  kind would have only two properties, one storing a FundingOrganization
 Key
  and the other a Campaign Key, then you can use it to query for all
  FundingOrganization entities associated with a given Campaign and vice
  versa. This approach doesn't require you to modify your Campaign kind at
  all, so you don't necessarily need to make it aware of the
  FundingOrganization kind, which was one of your requirements.
 
  Let me know if this answers your question or if you have any other
  questions.
 
  - Jason
 
  On Thu, Oct 29, 2009 at 1:55 PM, Hans gcbo...@gmail.com wrote:
 
   Hoping someone might help me with a somewhat OT question.
 
   I developed an object model for a GAE/J application that worked fairly

 ...

   Can someone point this rookie to intro material/URLs for building and
   refactoring designs that lend themselves to these type of changes? I'm
   looking for info on adaptable design, especially when you're using a
   datastore and not using a RDBMS, junction tables, etc.
 
   thanks,
   Hans
 
 
 


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[appengine-java] Re: Error while uploading app to GAE

Did your path always include the one \ delimiter with all of the other
separators being /?

- Jason

On Mon, Nov 2, 2009 at 7:45 PM, Vik vik@gmail.com wrote:

 Hie

 Today all of a sudden when i tried to deploy my app to GAE throws errors:
 An internal error occurred during: Deploying SakshumWebProduction to
 Google.
 Received IOException parsing the input stream for
 D:/eclipse/vskumar/workspace/SakshumWebProduction/war\WEB-INF/web.xml

 The contents of web.xml are just fine. here it is:
 ?xml version=1.0 encoding=utf-8?
 !DOCTYPE web-app PUBLIC
 -//Sun Microsystems, Inc.//DTD Web Application 2.3//EN
 http://java.sun.com/dtd/web-app_2_3.dtd;

 web-app xmlns=http://java.sun.com/xml/ns/javaee; version=2.5
 servlet
 servlet-namesakshumweb/servlet-name
 servlet-classvik.sakshum.sakshumweb.SakshumWebServlet/servlet-class
 /servlet
 servlet-mapping
 servlet-namesakshumweb/servlet-name
 url-pattern/sakshumweb/ui/page/url-pattern
 /servlet-mapping
 welcome-file-list
 welcome-fileindex.html/welcome-file
 /welcome-file-list
 /web-app

 Thankx and Regards

 Vik
 Founder
 www.sakshum.com
 www.sakshum.blogspot.com


 


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[appengine-java] Re: Master/Detail relations and redundant data handling

2009-11-04 Thread James H


Rusty, Thanks for the code sample!  How do you decide when to use key
type of Key vs String?

On Nov 4, 1:45 pm, James H james.hollier...@gmail.com wrote:
 Datanucleus, both suggestions worked but I like the embeddedOnly
 best in order to avoid a dummy key on every FK class!

 Bryce, I no longer get the error above...I just added
 embeddedOnly=true to the PersistanceCapable tag in BookFk class.
 You're right, I could use the collection technique on the FKs but I
 wonder the pros/cons of such collections on what could be very large
 collections.  For example, say Baylor with 25,000 members?  Guess its
 a matter of using owned for small Sets versus unowned for large
 Sets of data.  Regardless, your FK pattern will save a whole lot of
 code management!!!

 Any further feedback welcome...I'll continue testing!

 On Nov 4, 12:12 pm, datanucleus andy_jeffer...@yahoo.com wrote:



   Needs a PK either way. Pick a field, any field.

  Or just set embeddedOnly as true ... if you really never want to
  persist one of those in its own right- Hide quoted text -

 - Show quoted text -
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[appengine-java] Re: Java namespace for entity in bulkloader?

Typo (I think):

   - Query q = new Query(package.MyClass) // manually pass full package
   name

should be:

   - Query q = new Query(SELECT * FROM package.MyClass) // manually pass
   full package name


Stuart

On Wed, Nov 4, 2009 at 4:43 PM, Stuart Moffatt stuartmoff...@gmail.comwrote:

 Nick,

 I've used a java loader in hosted mode (to spare the expense of doing it in
 production) for all of my entities. When I load them locally, /_ah/admin
 reports the simple name of the entity, with the right data. But my java code
 needs to query with the full package name.

 For instance, these work in hosted mode after entities loaded via Java
 loader

- Query q = new Query(MyClass.class) // automatically passes full
package name
- Query q = new Query(package.MyClass) // manually pass full package
name

 But these do not work in hosted mode after entities loaded via Java loader

- Query q = new Query(SELECT * FROM MyClass) // simple name fails to
map to package name
- Query q = new Query(MyClass.class.getSimpleName()) // simple name
fails to map to package name

 I am hoping I have explained this correctly. I got so confused yesterday
 trying to distinguish between:

- working / not working (ie JDO error)
- combined with hosted/production
- combined with python/java loaders

 In your example at
 http://blog.notdot.net/2009/9/Advanced-Bulk-Loading-Part-5-Bulk-Loading-for-Java
  what
 is the corresponding java package name for the python model Film? Do
 Films pushed via the bulk loader get returned when your Java code queries
 for Film.class or SELECT * FROM Film?

 I guess I am looking for validation (ie, working code) that entities pushed
 with a python bulkloader can be queried properly using Java. Like I said, I
 have probably got either the Query syntax wrong in the servlet or the
 annotations wrong in the class.

 If you add some Java code to the Film example, it would help immensely.

 Stuart


 On Wed, Nov 4, 2009 at 4:24 PM, Nick Johnson (Google) 
 nick.john...@google.com wrote:

 Hi Stuart,

 I'm not sure why this would be happening. Your best option might be to
 insert a record using Java, then check how it shows up in the admin console,
 and make sure to use the exact same name for the kind you use in the Java
 loader.

 -Nick Johnson


 On Wed, Nov 4, 2009 at 6:25 PM, Stuart Moffatt 
 stuartmoff...@gmail.comwrote:

 Maybe I didn't word my problem very well.

 Let me describe it again:

 Data push:
 1. I am bulkloading data to an app using python appcfg and custom
 bulkloaders.
 2. The custom bulk loaders are pushing data from a CSV.
 3. The models of the data being pushed have simple names in python (no
 package namespace)
 4. The entities all get successfully uploaded.

 Data query:
 1. The application that uses the data pushed via bulk loading is in
 Java
 2. Because it's in Java, there is a package namespace for where my
 entity classes exist
 3. App Engine is supposed to ignore the long package namespace and
 just pick up the simple name (ie, the name of the class)
 4. These simple names are supposed to match the simple names of the
 data that was pushed via bulk loading.

 The problem:
 1. Queries for the simple name via the admin interface return data as
 expected
 2. Queries for the simple name via Java code do NOT return data as
 expected. Instead I get a JDO error about the class not being found
 (sorry, don't have my code in front of me to list the trace).
 Basically, it seems that a query for a simple name throws an error
 when that simple class name exists in a fully named package.

 I am using JDO annotations in my classes as per the tutorials. Is
 there some magic that I am missing? Perhaps I am doing something wrong
 with my annotations?

 I would rather post details, but wanted to get a handle on the general
 problem before I bog down the list with a stack trace and entity code.

 Stuart

 On Nov 3, 5:06 pm, Stuart Moffatt stuartmoff...@gmail.com wrote:
  I am using Nick's excellent tutorials on bulk loading, and was able to
  push a huge pile of entities up to production. Problem is, they looked
  like this:
 
  MySpecialEntity
 
  in my custom python bulkloader class and in production.
 
  The gotcha is my application is Java, and queries for:
 
  SELECT FROM org.domain.app.MySpecialEntity
 
  fail because the Javanamespacewas not part of the python bulkloader.
 
  Anyone know a workaround?
 
  Stuart




 --
 Nick Johnson, Developer Programs Engineer, App Engine
 Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number:
 368047




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[appengine-java] Re: Java namespace for entity in bulkloader?

Nick,

 Can you clarify what you mean by 'java loader' and 'hosted mode'?

My java loader is a servlet which loads a CSV from disk, processes it and
persists entities to the datastore. The CSV has the values for the
properties I want my entity to have. The CSV and the data it points to is in
WEB-INF, so I can get away with loading large sets in hosted mode and
smaller sets in production (because  of the static file limit and request
timeout it is not possible to load all of my data in production using this
method). The Kind is created when I persist that first entity. This is
functionally similar to a python bulk loader, except it is a one-off
servlet, and does not come with all of the configuration and transport
mechanism options that provided by the python SDK.

 In the Python SDK, entities are named after the unqualified name of the
class, by default - so a 'Film' gets loaded with an entity name of 'Film'.
You can specify a custom entity type name with the kind() method. I'm still
not hugely familiar with Java, so I'm not sure under which conditions it
will use qualified and unqualified names - basically, you need to match
those with your Python loaders.

At one point I tried to convince bulkloader.py (using
--kind=package.MyClass) and my custom bulk loader
(bulkloader.Loader.__init__(self, 'package.MyClass')) to accept the full
java package name, but even when I used namespaces in the python model, this
did not work.

Perhaps a python example for the kind() method you mention? Am I correct in
assuming that I should provide a  kind() method in my custom bulk loader
which overrides the default in much the same way as handle_entity() or
generate_key() gives you a hook into those functions?

In other words, should I try this?


class MyClass(db.Model):
  name = db.StringProperty()
  other_property = db.StringProperty()

class MyClass(bulkloader.Loader):
 def __init__(self):
  bulkloader.Loader.__init__(self, 'MyClass',
[('name', str),
('other_property', str)
])

 def kind(self, entity):
  return 'package.MyClass'



I understand if you can't provide a Java example, no worries. In lieu of
that, could you provide a full example of customizing the python model's
namespace using the kind() method in a custom bulkloader, along with the
command line syntax to push it (with appcfg.py using the custom loader). And
if that's not enough grin it would be good to see the query syntax in the
runtime application (e.g. SELECT * from package.MyName with the right
python import statements).

Thanks for your help on this.

Stuart

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[appengine-java] Re: Java namespace for entity in bulkloader?

On Wed, Nov 4, 2009 at 11:31 PM, Stuart Moffatt stuartmoff...@gmail.comwrote:

 Nick,


  Can you clarify what you mean by 'java loader' and 'hosted mode'?

 My java loader is a servlet which loads a CSV from disk, processes it and
 persists entities to the datastore. The CSV has the values for the
 properties I want my entity to have. The CSV and the data it points to is in
 WEB-INF, so I can get away with loading large sets in hosted mode and
 smaller sets in production (because  of the static file limit and request
 timeout it is not possible to load all of my data in production using this
 method). The Kind is created when I persist that first entity. This is
 functionally similar to a python bulk loader, except it is a one-off
 servlet, and does not come with all of the configuration and transport
 mechanism options that provided by the python SDK.


  In the Python SDK, entities are named after the unqualified name of the
 class, by default - so a 'Film' gets loaded with an entity name of 'Film'.
 You can specify a custom entity type name with the kind() method. I'm still
 not hugely familiar with Java, so I'm not sure under which conditions it
 will use qualified and unqualified names - basically, you need to match
 those with your Python loaders.

 At one point I tried to convince bulkloader.py (using
 --kind=package.MyClass) and my custom bulk loader
 (bulkloader.Loader.__init__(self, 'package.MyClass')) to accept the full
 java package name, but even when I used namespaces in the python model, this
 did not work.


 Perhaps a python example for the kind() method you mention? Am I correct in
 assuming that I should provide a  kind() method in my custom bulk loader
 which overrides the default in much the same way as handle_entity() or
 generate_key() gives you a hook into those functions?


Pretty much, except kind() is a method for Model classes, not loaders. Like
this:

class Foo(db.Model):
  @classmethod
  def kind(self):
return 'my.Foo'



 In other words, should I try this?

 
 class MyClass(db.Model):
   name = db.StringProperty()
   other_property = db.StringProperty()

 class MyClass(bulkloader.Loader):
  def __init__(self):
   bulkloader.Loader.__init__(self, 'MyClass',
 [('name', str),
 ('other_property', str)
 ])

  def kind(self, entity):
   return 'package.MyClass'
 


 I understand if you can't provide a Java example, no worries. In lieu of
 that, could you provide a full example of customizing the python model's
 namespace using the kind() method in a custom bulkloader, along with the
 command line syntax to push it (with appcfg.py using the custom loader).


As above, and specify the kind you declared in the Python module on the
command line and in the loader.



 And if that's not enough grin it would be good to see the query syntax in
 the runtime application (e.g. SELECT * from package.MyName with the right
 python import statements).


If you're using GQL, you need to use the kind name, not the class name (so
in this example it would be SELECT * FROM my.Foo).

-Nick



 Thanks for your help on this.

 Stuart




-- 
Nick Johnson, Developer Programs Engineer, App Engine
Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number:
368047

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[appengine-java] Re: Java namespace for entity in bulkloader?

Nick,


 Pretty much, except kind() is a method for Model classes, not loaders. Like
 this:

 class Foo(db.Model):
   @classmethod
   def kind(self):
 return 'my.Foo'



The above kind() method makes more sense (in the model instead of the
loader). Was not aware of it as the docs don't give much of a hint (
http://code.google.com/appengine/docs/python/datastore/modelclass.html#Model_kind)
as to other uses. Thanks for pointing it out.

As above, and specify the kind you declared in the Python module on the
 command line and in the loader.


Just to clarify, my loader will look like this:


class Foo(db.Model):
  name = db.StringProperty()
  data = db.IntegerProperty()

  @classname
  def kind(self, entity):
return 'my.Foo'

class FooLoader(bulkloader.Loader):
 def __init__(self):
  bulkloader.Loader.__init__(self, 'my.Foo',
[('name', str),
('data', int)
])


and my command line will have --kind=my.Foo

Correct?




 And if that's not enough grin it would be good to see the query syntax
 in the runtime application (e.g. SELECT * from package.MyName with the
 right python import statements).


 If you're using GQL, you need to use the kind name, not the class name (so
 in this example it would be SELECT * FROM my.Foo).


Yes, GQL is how I will access, so I will use the full Kind name. It also
seems that in Java if I use:

  Query q = new Query(Foo.class)

that the resulting query will be generate a statement with SELECT * FROM
my.Foo

I will give this a shot (later tonight) and post my results to the list.

Unfortunately, I pushed all of my data without the kind() method in the
model exposing the full name of my corresponding Java class. I don't think
there is any way fix the data in the store, except to delete it all and
start again with the updated model and bulk loader. Correct?

Stuart

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[appengine-java] JDO/JPA Snippets That Work - Unindexed Properties

2009-11-04 Thread Max Ross (Google)

http://gae-java-persistence.blogspot.com/2009/11/unindexed-properties.html

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[appengine-java] Re: Recommended scope for DatastoreService

2009-11-04 Thread Roy Smith

Hi Max

Thx for the answer, especially the correction on the transaction
implementation.

The solution I'd arrived at is to use Guice to instantiate my DsS with a
scope of @RequestScoped. Do you see any problems with that approach?

best
Roy


On Wed, Nov 4, 2009 at 7:02 PM, Max Ross (Google)
maxr+appeng...@google.commaxr%2bappeng...@google.com
 wrote:

 A DatastoreService instance is extremely lightweight so feel free to create
 them as-needed.  In addition, transactions are not tied to a specific
 DatastoreService instance but rather to the thread that started the
 transaction.  Finally, assume that all classes in the api are _not_
 threadsafe unless explicitly documented otherwise.

 Hope this helps,
 Max


 On Wed, Nov 4, 2009 at 4:35 AM, Roy roy.sm...@cleverthinking.co.ukwrote:


 Should I be creating a DatastoreService for each session, or are
 they inexpensive enough that I can have one for each Kind? I realise
 that for transactions, the latter doesn't work.

 A related question is how threadsafe is an instance of
 DatastoreService?





 


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[appengine-java] Re: Master/Detail relations and redundant data handling

2009-11-04 Thread Rusty Wright


Thinking out loud here:

When you use that encoded string format you can use it wherever you'd use Key.  
The apparent advantage of using the encoded string format is that your dto 
isn't exposing GAE's Key.  With the encoded string your service layer can be 
oblivious about GAE's Key, without any extra code in your dao; otherwise, to 
hide the Key from the service layer it seems to me that you'd need to convert 
the Key to String via the KeyFactory methods.  Even then it seems a bit dodgy; 
if you're using your persistence layer's dtos in your view layer, which seems 
to be fashionable these days, then your jsp is probably going to want to use 
the primary key, for the value in the selects, check boxes, etc.

So one way to answer your question would be to say that you should (could) use 
String whenever your service layer, or above, uses a dto's primary key.

My question is, what's the down side to using the encoded string in all of your 
dtos?  My inclination is to just forget about Key and use the encoded string 
everywhere.

My other question is, do other databases support String for a primary key?  
I've always used something that's autoincremented, for example, a sequence, and 
those are always longs and their ilk.


James H wrote:
 Rusty, Thanks for the code sample!  How do you decide when to use key
 type of Key vs String?
 
 On Nov 4, 1:45 pm, James H james.hollier...@gmail.com wrote:
 Datanucleus, both suggestions worked but I like the embeddedOnly
 best in order to avoid a dummy key on every FK class!

 Bryce, I no longer get the error above...I just added
 embeddedOnly=true to the PersistanceCapable tag in BookFk class.
 You're right, I could use the collection technique on the FKs but I
 wonder the pros/cons of such collections on what could be very large
 collections.  For example, say Baylor with 25,000 members?  Guess its
 a matter of using owned for small Sets versus unowned for large
 Sets of data.  Regardless, your FK pattern will save a whole lot of
 code management!!!

 Any further feedback welcome...I'll continue testing!

 On Nov 4, 12:12 pm, datanucleus andy_jeffer...@yahoo.com wrote:



 Needs a PK either way. Pick a field, any field.
 Or just set embeddedOnly as true ... if you really never want to
 persist one of those in its own right- Hide quoted text -
 - Show quoted text -
  

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[google-appengine] Re: frame/object control with login

Hi,

Framing the login page is strongly discouraged, and may in fact be contrary
to the TOS. The only way for the user to determine that a login page for a
Google account is legitimate is to check if it's being served off the
google.com domain, and this is not possible inside a frame.

-Nick Johnson

On Mon, Nov 2, 2009 at 10:36 PM, reyelts reye...@gmail.com wrote:


 I apologize if I'm posting to the wrong place, I don't know if this is
 a basic HTML question, a Python question, a GAE question, or some
 combination of the set...

 Since we can't have much impact on the use login window for Google App
 Engine (ie to change the language or add an image), I'm looking at
 embedding the login page, like so:

 from google.appengine.extimport webapp
 from google.appengine.apiimport users

 class main(webapp.RequestHandler):
   def get(self):
   user = users.get_current_user()

  if user == None:
 self.response.out.write('html\nbody\n')
 self.response.out.write('pMy intro text/p\n')
 self.response.out.write('hr\n')
 self.response.out.write('object\n')
 self.response.out.write('  data=' + users.create_login_url
 (self.request.uri) + '\n')
 self.response.out.write('  type=text/html\n')
 self.response.out.write('  width=100% height=50%\n')
 self.response.out.write('/object')
 self.response.out.write('hr\n')
 self.response.out.write('/body\n/html\n')
  else:
 self.response.out.write('html\nbody\n')
 self.response.out.write('p' + user.nickname() + 'is logged
 in!/p\n')
 self.response.out.write('/body\n/html\n')

 This works fine: I get My intro text at the top of the window
 followed by a pane with the login. However, when I login, the result
 (user is logged in) is written to the pane where the login occurred,
 vs. replacing the whole window. I tried this with the older iframe,
 and get the same result.

 Is there a way to re-take over the complete window (ie make the frame
 I created go away) on the redirect?


 



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368047

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[google-appengine] Re: Permission to view, which way is more efficient?

Hi Lynge,

Storing a List of keys of users who may view a profile on the profile's
entity is probably the best way to do this.

-Nick Johnson


On Tue, Nov 3, 2009 at 12:54 AM, Lynge como...@gmail.com wrote:


 Hi
 The app I am about to build is going to have some kind of profile page
 for each user. The user will then be able to select other users that
 is able to view his/her profile. (Like facebook, I guess)

 My question is, how should I store these permissions?
 Each user will most likely be giving permission to under 20 other
 users.


 Solution #1:
 Have one model looking something like this:
viewer =user.id
can_view = user.id

 And then simply look there to see if one user can view the other users
 profile.

 Solution #2:
 Since it is most likely be less than 20 users per user, then maybe one
 could just store it as CSV or a tuple, or something along with the
 users profile.
 I am thinking this wont be good for the (freakish) users that will
 have 200 users with permission, but would it be faster that solution
 #1? As that first model would eventually be huge, but does that matter
 on GAE?
 This is my first app, so I am still thinking like I am developing for
 en RDBM backend so that is why I am asking here.

 So to recap. 1st solution is more elegant in term of scaling
 permissions per user, but creates a huge datapile.
 The other solution solves this, but creates problems for the few users
 that will have more than normal amount of permitted friends

 Of course if you have an even better solution, then by all means,
 share it :)

 Many thanks in advance.

 



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368047

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[google-appengine] Re: Data Size Differs in Stats and Quota Details

Hi Pavel,

The stats don't include indexes - the difference in size is the overhead
from your (automatic and composite) indexes.

-Nick Johnson

On Sun, Nov 1, 2009 at 11:14 AM, Pavel Kaplin pavel.kap...@gmail.comwrote:


 Datastore statistics says that Size of all entities is 18 Mbytes,
 however Quota Details shows 0.20 GBytes, which is ten times bigger.

 Where's the truth and why these values differ from each other?

 



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368047

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[google-appengine] Re: Data Size Differs in Stats and Quota Details

2009-11-04 Thread mably


Hi Nick,

We have exactly the same problem with our GAE application
(webwinewatch), but the ratio is even higher around 15.

It's probably related to the way we try to manage full-text indexes
via multi-value properties.

Will the future native full-text indexes (http://code.google.com/p/
googleappengine/issues/detail?id=217 is started) take as much space as
our current multi-value property solution ?

Thanx for you help.

François

On 4 nov, 10:03, Nick Johnson (Google) nick.john...@google.com
wrote:
 Hi Pavel,

 The stats don't include indexes - the difference in size is the overhead
 from your (automatic and composite) indexes.

 -Nick Johnson

 On Sun, Nov 1, 2009 at 11:14 AM, Pavel Kaplin pavel.kap...@gmail.comwrote:



  Datastore statistics says that Size of all entities is 18 Mbytes,
  however Quota Details shows 0.20 GBytes, which is ten times bigger.

  Where's the truth and why these values differ from each other?

 --
 Nick Johnson, Developer Programs Engineer, App Engine
 Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number:
 368047
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[google-appengine] Re: Can't verify App Engine Account as my Phone number is already verified

Hi,

If you are having trouble with SMS verification, or want an additional
account activated, please fill out the following form:

http://appengine.google.com/waitlist/sms_issues

(This is from the following FAQ http://code.google.com/appengine/kb/sms
.html#error )

Once you fill out this form, you should receive access within a day or two.

Happy coding,

Nick Johnson



On Fri, Oct 30, 2009 at 10:04 PM, Damien dam...@echwa.com wrote:


 Is there a way around this please as I would like to use App Engine
 but can not get past the verification check  and the message that I
 get on-screen says that it can not verify my mobile number as it has
 already done so.

 Damien
 



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[google-appengine] Re: XMPP Requests

Hi Kevin,

At the moment, App Engine XMPP bots can only receive XMPP messages of types
'normal' and 'chat'.

-Nick Johnson


On Fri, Oct 30, 2009 at 3:23 PM, kevinalle kevina...@gmail.com wrote:


 Hi.
 I am developing an app that uses the XMPP handler to make a chat bot..
 my question is:
 is it possible to write an iqHandler to handle other type of requests?
 i want my bot to have a profile. and to do that i need to answer to an
 xmpp request that looks like:

 iq type='get'
from='b...@shakespeare.lit/globe'
to='ham...@denmark.lit'
id='disco1'
  query xmlns='http://jabber.org/protocol/disco#info'/
 /iq

 can i write a handler for this type of request?
 thanks!
 Kevin

 



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[google-appengine] Re: Seeking any Good Opinions / Design Pattern Input




On Nov 3, 9:06 pm, nolybab thardin...@gmail.com wrote:
  For the most part, I don't need/want to be able to query
 within the data, but i do need to query by date to
 get entries. For instance, assume I am showing a google
 visualization for Fights Won plotted over the last 30 days.
 Therefore, all I would need to be able to do is to query all mwProfile
 objects for the past 30 days and return ALL the data.


A query can only return 1000 entities.

You could pre-calculate the fights won/lost data every time a new
profile is uploaded. i.e. save the profile, then retrieve a
WinLoss30Day entity, snip the 31st days data from the json (or
whatever) if the day has rolled over, append the new win/loss data to
the end, save it back. Return the json blob on query.

If there's likely to be = 1 upload a second (everyone updates at 12
after a hard day's fragging) you may run into the limit on concurrent
updates to a single entity. You could try pushing the win/loss
calculation into a task queue with concurrency 1.


 class mwProfile(db.Model):
     title=db.StringProperty()
     name=db.StringProperty()
     charclass=db.StringProperty()
     level=db.IntegerProperty()
     fb_sig_id=db.StringProperty()
     date=db.DateTimeProperty(auto_now_add=True)
     page=db.TextProperty();


7 propertires, 6 indexes (x2, ascending and descending). If you are
never going to query by eg. fb_sig_id, then you can add indexed=False
to the property. This will make saving the entity faster, it will use
less api_cpu time, and use less  db space.


         try:
             thisProfile=self
 ...
             retcode=1
         except:
             logging.error('...')


Don't use a bare 'except'. See here:

  http://code.google.com/p/googleappengine/issues/detail?id=1409#c8


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[google-appengine] AppEngine Appears to be Down, Hard

2009-11-04 Thread pdub


My app started returning 500 errors a few minutes ago.  I checked my
logs and saw tons of datastore timeout errors.  Now, I can't even get
into the web console anymore.
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[google-appengine] Re: AppEngine Appears to be Down, Hard

2009-11-04 Thread pdub


Okay, it's working again.  What was that all about?

On Nov 4, 7:13 am, pdub pwj...@gmail.com wrote:
 My app started returning 500 errors a few minutes ago.  I checked my
 logs and saw tons of datastore timeout errors.  Now, I can't even get
 into the web console anymore.
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[google-appengine] Re: Expando and Index partitioning




On Nov 3, 11:35 pm, Eli eli.jo...@gmail.com wrote:

 (This is just the first usage example that comes to mind.  This row
 naming method could be used for all sorts of set intersection stuff,
 and would cut down on insert times due to the fact that it should
 partition out the indexes when dealing with humongous datasets).


I don't think what your proposing is a physical optimisation because
indexes are not discrete objects as they are in a traditional
relational database:

http://code.google.com/appengine/articles/index_building.html#Index%20Layout


Forgetting about physical optimisation and thinking only about
querying slices of the data, how about something like this:

class Stats(db.Model):
number = db.IntegerProperty()
date = db.DateTimeProperty()
dimensions = db.StringListProperty()

e = Stats(number=42,
date=datetime.datetime('1605-11-05'),
dimensions=['1600', 'November', 'Q4', 'd5', 'Saturday'])

Then you could query by date, as in your example, by simply querying
against the date property. But you could also query for all numbers
for any Saturday in the 4th quarter of any year:

q4Saturdays = Stats.all().filter('dimensions =', 'Q4').filter
('dimensions =', 'Saturday')


 Anyway, this was just a side thought I had while wondering what the
 point of Expando was.. since it's so unstructured.. I couldn't imagine
 why someone would want such an undependable datasource..


http://steve-yegge.blogspot.com/2008/10/universal-design-pattern.html


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[google-appengine] Re: I am unable to update my cron.yaml

2009-11-04 Thread Wooble


the command is update_cron, not update-cron, although a normal
appcfg.py update should work too.

On Nov 3, 3:57 pm, SK shanmu...@gmail.com wrote:
 Hi,
 I wrote the following cron.yaml file, but it is not being updated to
 the server. I have updated the folder with appcfg.py update
 foldername. I have also tried appcfg.py update-cron, but it has failed
 by saying 'unknown action'.
 Could some one please help me with this.

 cron.yaml:

 cron:
 - description: update the datastrore
   url: /newPuddle
   schedule: every 1 min

 app.yaml:

 application: appid
 version: 1
 runtime: python
 api_version: 1

 handlers:
 - url: /favicon.ico
   static_files: favicon.ico
   upload: favicon.ico

 - url: /.*
   script: pu.py
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[google-appengine] Possible saving of metadata space by having short model class name?

2009-11-04 Thread Anh Hai Trinh


Since every full entity key includes the name of its model class (and
its parents'), is the following scheme preferable in term of metadata
space usage?

Instead of

  class MyModelClassWithLongName(db.Model):
  ...

I'd use:

  class MWLN(db.Model):
  ...

  MyModelWithLongName = MWLN


aht
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[google-appengine] Re: AppEngine Appears to be Down, Hard

2009-11-04 Thread Michał Klich


Mine is down right now.
I thought that i messed up something when rolling back update.

On Nov 4, 2:17 pm, pdub pwj...@gmail.com wrote:
 Okay, it's working again.  What was that all about?

 On Nov 4, 7:13 am, pdub pwj...@gmail.com wrote:



  My app started returning 500 errors a few minutes ago.  I checked my
  logs and saw tons of datastore timeout errors.  Now, I can't even get
  into the web console anymore.
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[google-appengine] Re: Possible saving of metadata space by having short model class name?


Yes, that helps.  Mainly, you want to make sure the keys for your most
frequently used entities are the shortest (see Huffman Encoding) if
you will have a large datastore (though, this may be good practice in
general).

It is discussed in the Building Scalable Web Apps IO talk from this
year:

Building Scalable, Complex Apps on App Engine
http://www.youtube.com/watch?v=AgaL6NGpkB8

Anyway, I highly recommend everyone developing apps on Appengine watch
any IO talks from 2008 or 2009 having to do with GAE or Bigtable or
other stuff.  Google has gone out of its way to explain to people how
to make their applications radical.. or fast or scalable or whatever
word pleases you.


On Nov 4, 9:55 am, Anh Hai Trinh anh.hai.tr...@gmail.com wrote:
 Since every full entity key includes the name of its model class (and
 its parents'), is the following scheme preferable in term of metadata
 space usage?

 Instead of

   class MyModelClassWithLongName(db.Model):
       ...

 I'd use:

   class MWLN(db.Model):
       ...

   MyModelWithLongName = MWLN

 aht
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[google-appengine] HTTP Basic authentication

2009-11-04 Thread bsb


I think I read in some thread on this forum that HTTP Basic
Authentication is possible somehow with GAE. Is this correct? If yes,
how to do that? I have a very simple webservice backend for an iPhone
app which I would like to protect from unintended access, so HTTP
Basic Authentication would be by far the easiest solution...

Thanks in advance for any pointers,
Benjamin
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[google-appengine] Re: Possible saving of metadata space by having short model class name?

2009-11-04 Thread Rafe


  And alternative would be to override 'kind'.  Just make sure you
remember when doing GQL queries in the console:

  class MyModelClassWithLongName(db.Model):

def kind(self):
  return 'MWLN'

On Nov 4, 6:55 am, Anh Hai Trinh anh.hai.tr...@gmail.com wrote:
 Since every full entity key includes the name of its model class (and
 its parents'), is the following scheme preferable in term of metadata
 space usage?

 Instead of

   class MyModelClassWithLongName(db.Model):
       ...

 I'd use:

   class MWLN(db.Model):
       ...

   MyModelWithLongName = MWLN

 aht
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[google-appengine] My app died

2009-11-04 Thread Michał Klich


After some minor problems that happened with GAE my app throws error

Traceback (most recent call last):
  File /base/python_lib/versions/1/google/appengine/ext/webapp/
__init__.py, line 507, in __call__
handler.get(*groups)
  File /base/data/home/apps/contacts-exporter/1-01a.
337517615887767102/contacts-list.py, line 197, in get
self.response.out.write(template.render(path, template_values))
  File /base/python_lib/versions/1/google/appengine/ext/webapp/
template.py, line 80, in render
t = load(template_path, debug)
  File /base/python_lib/versions/1/google/appengine/ext/webapp/
template.py, line 108, in load
template = django.template.loader.get_template(file_name)
  File /base/python_lib/versions/third_party/django-0.96/django/
template/loader.py, line 80, in get_template
template = get_template_from_string(source, origin, template_name)
  File /base/python_lib/versions/third_party/django-0.96/django/
template/loader.py, line 88, in get_template_from_string
return Template(source, origin, name)
  File /base/python_lib/versions/third_party/django-0.96/django/
template/__init__.py, line 158, in __init__
self.nodelist = compile_string(template_string, origin)
  File /base/python_lib/versions/third_party/django-0.96/django/
template/__init__.py, line 174, in compile_string
return parser.parse()
  File /base/python_lib/versions/third_party/django-0.96/django/
template/__init__.py, line 273, in parse
compiled_result = compile_func(self, token)
  File /base/python_lib/versions/third_party/django-0.96/django/
template/defaulttags.py, line 660, in do_if
boolvars.append((False, parser.compile_filter(boolpair)))
  File /base/python_lib/versions/third_party/django-0.96/django/
template/__init__.py, line 338, in compile_filter
return FilterExpression(token, self)
  File /base/python_lib/versions/third_party/django-0.96/django/
template/__init__.py, line 558, in __init__
raise TemplateSyntaxError, Could not parse the remainder: %s %
token[upto:]
TemplateSyntaxError: Could not parse the remainder: ()


Code is same, what could be a problem?
This is my MainPage class.

class MainPage(webapp.RequestHandler):
def get(self):
user = users.get_current_user()
if user:
text = 'Hello, ' + user.nickname()

SyncPrivateEntity(user.email())
## Loading lists from datastore
listc = getContacts(user, prvEmailsList)
sharedlist = getContacts()

template_values = {'text' : text,
   'listc' : listc,
   'sharedlist' : sharedlist}
else:
self.redirect(users.create_login_url(self.request.uri))
path = os.path.join(os.path.dirname(__file__),
'index.html')
self.response.out.write(template.render(path, template_values))
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[google-appengine] Re: My app died

2009-11-04 Thread Michał Klich


Nevermind, my fault.
Disregard this post please.


On Nov 4, 5:15 pm, Michał Klich klich.mic...@gmail.com wrote:
 After some minor problems that happened with GAE my app throws error

 Traceback (most recent call last):
   File /base/python_lib/versions/1/google/appengine/ext/webapp/
 __init__.py, line 507, in __call__
     handler.get(*groups)
   File /base/data/home/apps/contacts-exporter/1-01a.
 337517615887767102/contacts-list.py, line 197, in get
     self.response.out.write(template.render(path, template_values))
   File /base/python_lib/versions/1/google/appengine/ext/webapp/
 template.py, line 80, in render
     t = load(template_path, debug)
   File /base/python_lib/versions/1/google/appengine/ext/webapp/
 template.py, line 108, in load
     template = django.template.loader.get_template(file_name)
   File /base/python_lib/versions/third_party/django-0.96/django/
 template/loader.py, line 80, in get_template
     template = get_template_from_string(source, origin, template_name)
   File /base/python_lib/versions/third_party/django-0.96/django/
 template/loader.py, line 88, in get_template_from_string
     return Template(source, origin, name)
   File /base/python_lib/versions/third_party/django-0.96/django/
 template/__init__.py, line 158, in __init__
     self.nodelist = compile_string(template_string, origin)
   File /base/python_lib/versions/third_party/django-0.96/django/
 template/__init__.py, line 174, in compile_string
     return parser.parse()
   File /base/python_lib/versions/third_party/django-0.96/django/
 template/__init__.py, line 273, in parse
     compiled_result = compile_func(self, token)
   File /base/python_lib/versions/third_party/django-0.96/django/
 template/defaulttags.py, line 660, in do_if
     boolvars.append((False, parser.compile_filter(boolpair)))
   File /base/python_lib/versions/third_party/django-0.96/django/
 template/__init__.py, line 338, in compile_filter
     return FilterExpression(token, self)
   File /base/python_lib/versions/third_party/django-0.96/django/
 template/__init__.py, line 558, in __init__
     raise TemplateSyntaxError, Could not parse the remainder: %s %
 token[upto:]
 TemplateSyntaxError: Could not parse the remainder: ()

 Code is same, what could be a problem?
 This is my MainPage class.

 class MainPage(webapp.RequestHandler):
     def get(self):
         user = users.get_current_user()
         if user:
             text = 'Hello, ' + user.nickname()

             SyncPrivateEntity(user.email())
             ## Loading lists from datastore
             listc = getContacts(user, prvEmailsList)
             sharedlist = getContacts()

             template_values = {'text' : text,
                                'listc' : listc,
                                'sharedlist' : sharedlist}
         else:
             self.redirect(users.create_login_url(self.request.uri))
         path = os.path.join(os.path.dirname(__file__),
 'index.html')
         self.response.out.write(template.render(path, template_values))
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[google-appengine] How can i query the system time?

2009-11-04 Thread Tito George


How can i query like this JDO select sysdate from dual ?

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[google-appengine] Re: frame/object control with login

2009-11-04 Thread ryan baldwin

Nick,

I think you're overestimating the proverbial average user. In fact, in
user testing our own application, users are almost unanimously tripped up
when they are redirected to Google to login. We frequently *heard* the user
say this:

Okay, now I click here to login and... oh... why am I asked to login to
Google?

I'm just pointing this out so that we don't all get stuck in a belief set
that may not be accurate. Personally, I think Google needs to come up with
an API (whether it be javascript or otherwise) for AppEngine apps to
authenticate users more naturally. It's very jarring and, dare I say, short
sited to force all users of all apps away from an application to an
unbranded login screen.

- ryan.


On Wed, Nov 4, 2009 at 2:40 AM, Nick Johnson (Google) 
nick.john...@google.com wrote:

 Hi,

 Framing the login page is strongly discouraged, and may in fact be contrary
 to the TOS. The only way for the user to determine that a login page for a
 Google account is legitimate is to check if it's being served off the
 google.com domain, and this is not possible inside a frame.

 -Nick Johnson


 On Mon, Nov 2, 2009 at 10:36 PM, reyelts reye...@gmail.com wrote:


 I apologize if I'm posting to the wrong place, I don't know if this is
 a basic HTML question, a Python question, a GAE question, or some
 combination of the set...

 Since we can't have much impact on the use login window for Google App
 Engine (ie to change the language or add an image), I'm looking at
 embedding the login page, like so:

 from google.appengine.extimport webapp
 from google.appengine.apiimport users

 class main(webapp.RequestHandler):
   def get(self):
   user = users.get_current_user()

  if user == None:
 self.response.out.write('html\nbody\n')
 self.response.out.write('pMy intro text/p\n')
 self.response.out.write('hr\n')
 self.response.out.write('object\n')
 self.response.out.write('  data=' + users.create_login_url
 (self.request.uri) + '\n')
 self.response.out.write('  type=text/html\n')
 self.response.out.write('  width=100% height=50%\n')
 self.response.out.write('/object')
 self.response.out.write('hr\n')
 self.response.out.write('/body\n/html\n')
  else:
 self.response.out.write('html\nbody\n')
 self.response.out.write('p' + user.nickname() + 'is logged
 in!/p\n')
 self.response.out.write('/body\n/html\n')

 This works fine: I get My intro text at the top of the window
 followed by a pane with the login. However, when I login, the result
 (user is logged in) is written to the pane where the login occurred,
 vs. replacing the whole window. I tried this with the older iframe,
 and get the same result.

 Is there a way to re-take over the complete window (ie make the frame
 I created go away) on the redirect?






 --
 Nick Johnson, Developer Programs Engineer, App Engine
 Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number:
 368047

 


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[google-appengine] Snow Leopard

2009-11-04 Thread Glenn


I'm running Snow Leopard and therefore by default Python 2.6.

I know that I need Python 2.5.

I'm running the first Hello, World example, and trying the following
at the Unix prompt in Terminal:

%python2.5 /usr/local/bin/dev_appserver.py helloworld/

and this is what I get:

Traceback (most recent call last):
 File /usr/local/bin/dev_appserver.py, line 60, in module
   run_file(__file__, globals())
 File /usr/local/bin/dev_appserver.py, line 57, in run_file
   execfile(script_path, globals_)
 File /Applications/GoogleAppEngineLauncher.app/Contents/Resources/
GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/
google/appengine/tools/dev_appserver_main.py, line 65, in module
   from google.appengine.tools import os_compat
ImportError: cannot import name os_compat

What am I missing?

Thanks.

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[google-appengine] Specifying App Engine Server Locations

2009-11-04 Thread Nick T


Hi - We're working on a project that requires we can specify only
servers located within the European Union.

Is this possible with Google App Engine?

Thanks!

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[google-appengine] Re: Datastore writes are temporarily unavailable

2009-11-04 Thread ke...@allcapsapps.com


Hi Jeff,
Any update on the expected remaining time past 6:00?
Thanks

On Nov 3, 6:10 pm, Jeff S (Google) j...@google.com wrote:
 Hi all,

 Apologies for the delay, the status site has been updated to mention
 this planned maintenance.

 Thank you,

 Jeff

 P.S. As noted in the following blog post, we also plan maintenance on
 December 1st.

 http://googleappengine.blogspot.com/2009/09/migration-to-better-datas...

 On Nov 3, 5:42 pm, AS stripe...@gmail.com wrote:

  Yes.  No fix still, and no good status

  On Nov 3, 8:31 pm, RollingCircle e.j.hard...@gmail.com wrote:

   Datastore writes are temporarily unavailable. Please 
   seehttp://code.google.com/status/appengineformoreinformation.;

   11-03 05:21PM 32.889 , application metutil.

   Hordes of the blighters.

   The status page was apparently repeating some mantra about everything
   being OK, despite everything being clearly Pete Tong on the App Engine
   datastore front.

   Anyone else?

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[google-appengine] Re: After the scheduled maintenance, can no longer deploy app

2009-11-04 Thread ctea


I'm getting the same error.  It just started about an hour ago.


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[google-appengine] Re: Expando and Index partitioning


Stephen,

My thinking on this is..

Say you have a Month Column.. and it has the default lexically sorted
asc,dsc indexes on it.

My assumption is, when you insert a new row with a Month value
defined, the entire index will have to be updated (no matter how many
shards or tablets it's broken up into).

This is supported by this quote from the Index Building document you
linked to:

When an entity is created or deleted, all of the index rows for that
entity must be updated.

So.. when you roll around to the June 2010 time period and start
inserting rows for that.. if you have a generic Month column, all the
indexes for every month for every year will have to be updated.

Now, if you had them partitioned out in the way I described,
presumably, you would just need to rebuild the indexes for entries
with a June column.

Granted this isn't most optimal, why not just go all out and do
June2009, June2010 columns (and still have the y2009,y2010
columns too for quickly grabbing yearly data).. that way.. once the
month of the year is past, those indexes would never need to be
rebuilt again.. yet, since you were using the Expando model, you
wouldn't need seperately defined Models for each MonthYear combo.

Mainly, I see this method as a way of helping BigTable out in
understanding how to partition out my data...

Does this make sense?

I think your ListProperty idea sounds efficient to implement, but I
think it would run into that index updating issue once you got into
the 100s of millions and billions of rows.. every new insert would
require the dimensions and date columns to be rebuilt.  Now, these are
my assumptions.. which are fraught with peril... so, I'm trying to
post it here to see if anyone else out there is of a mind to think it
through with me.

Thanks for any input.


On Nov 4, 9:10 am, Stephen sdea...@gmail.com wrote:
 On Nov 3, 11:35 pm, Eli eli.jo...@gmail.com wrote:



  (This is just the first usage example that comes to mind.  This row
  naming method could be used for all sorts of set intersection stuff,
  and would cut down on insert times due to the fact that it should
  partition out the indexes when dealing with humongous datasets).

 I don't think what your proposing is a physical optimisation because
 indexes are not discrete objects as they are in a traditional
 relational database:

 http://code.google.com/appengine/articles/index_building.html#Index%2...

 Forgetting about physical optimisation and thinking only about
 querying slices of the data, how about something like this:

 class Stats(db.Model):
     number = db.IntegerProperty()
     date = db.DateTimeProperty()
     dimensions = db.StringListProperty()

 e = Stats(number=42,
     date=datetime.datetime('1605-11-05'),
     dimensions=['1600', 'November', 'Q4', 'd5', 'Saturday'])

 Then you could query by date, as in your example, by simply querying
 against the date property. But you could also query for all numbers
 for any Saturday in the 4th quarter of any year:

 q4Saturdays = Stats.all().filter('dimensions =', 'Q4').filter
 ('dimensions =', 'Saturday')

  Anyway, this was just a side thought I had while wondering what the
  point of Expando was.. since it's so unstructured.. I couldn't imagine
  why someone would want such an undependable datasource..

 http://steve-yegge.blogspot.com/2008/10/universal-design-pattern.html
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[google-appengine] Re: Snow Leopard

2009-11-04 Thread ryan baldwin

You have to switch to 2.5. Easy to do.

Open a terminal and throw this command to the wind:

defaults write com.apple.versioner.python Version 2.5

Enjoy!

- ryan.

On Wed, Nov 4, 2009 at 8:37 AM, Glenn glenn.down...@gmail.com wrote:


 I'm running Snow Leopard and therefore by default Python 2.6.

 I know that I need Python 2.5.

 I'm running the first Hello, World example, and trying the following
 at the Unix prompt in Terminal:

 %python2.5 /usr/local/bin/dev_appserver.py helloworld/

 and this is what I get:

 Traceback (most recent call last):
  File /usr/local/bin/dev_appserver.py, line 60, in module
   run_file(__file__, globals())
  File /usr/local/bin/dev_appserver.py, line 57, in run_file
   execfile(script_path, globals_)
  File /Applications/GoogleAppEngineLauncher.app/Contents/Resources/
 GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/
 google/appengine/tools/dev_appserver_main.py, line 65, in module
   from google.appengine.tools import os_compat
 ImportError: cannot import name os_compat

 What am I missing?

 Thanks.

 


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[google-appengine] Re: frame/object control with login

2009-11-04 Thread Joshua Smith

+1.

We've abandoned using google's user authentication for exactly this  
reason.  It confused the hell out of all our users.

When we started using google apps for our email, it started confusing  
the hell out of us.

-Joshua

On Nov 4, 2009, at 1:44 PM, ryan baldwin wrote:

 Nick,

 I think you're overestimating the proverbial average user. In  
 fact, in user testing our own application, users are almost  
 unanimously tripped up when they are redirected to Google to login.  
 We frequently heard the user say this:

 Okay, now I click here to login and... oh... why am I asked to  
 login to Google?

 I'm just pointing this out so that we don't all get stuck in a  
 belief set that may not be accurate. Personally, I think Google  
 needs to come up with an API (whether it be javascript or otherwise)  
 for AppEngine apps to authenticate users more naturally. It's very  
 jarring and, dare I say, short sited to force all users of all apps  
 away from an application to an unbranded login screen.

 - ryan.


 On Wed, Nov 4, 2009 at 2:40 AM, Nick Johnson (Google) 
 nick.john...@google.com 
  wrote:
 Hi,

 Framing the login page is strongly discouraged, and may in fact be  
 contrary to the TOS. The only way for the user to determine that a  
 login page for a Google account is legitimate is to check if it's  
 being served off the google.com domain, and this is not possible  
 inside a frame.

 -Nick Johnson


 On Mon, Nov 2, 2009 at 10:36 PM, reyelts reye...@gmail.com wrote:

 I apologize if I'm posting to the wrong place, I don't know if this is
 a basic HTML question, a Python question, a GAE question, or some
 combination of the set...

 Since we can't have much impact on the use login window for Google App
 Engine (ie to change the language or add an image), I'm looking at
 embedding the login page, like so:

 from google.appengine.extimport webapp
 from google.appengine.apiimport users

 class main(webapp.RequestHandler):
   def get(self):
  user = users.get_current_user()

  if user == None:
 self.response.out.write('html\nbody\n')
 self.response.out.write('pMy intro text/p\n')
 self.response.out.write('hr\n')
 self.response.out.write('object\n')
 self.response.out.write('  data=' + users.create_login_url
 (self.request.uri) + '\n')
 self.response.out.write('  type=text/html\n')
 self.response.out.write('  width=100% height=50%\n')
 self.response.out.write('/object')
 self.response.out.write('hr\n')
 self.response.out.write('/body\n/html\n')
  else:
 self.response.out.write('html\nbody\n')
 self.response.out.write('p' + user.nickname() + 'is logged
 in!/p\n')
 self.response.out.write('/body\n/html\n')

 This works fine: I get My intro text at the top of the window
 followed by a pane with the login. However, when I login, the result
 (user is logged in) is written to the pane where the login occurred,
 vs. replacing the whole window. I tried this with the older iframe,
 and get the same result.

 Is there a way to re-take over the complete window (ie make the frame
 I created go away) on the redirect?






 -- 
 Nick Johnson, Developer Programs Engineer, App Engine
 Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration  
 Number: 368047




 


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[google-appengine] Re: frame/object control with login

2009-11-04 Thread reyelts


I admit to not having been through all of the Java documentation on
http://code.google.com/appengine/docs/. I have, however, been through
the Python stuff extensively and never came across anything that
suggests framing the login page is strongly discouraged. In fact,
some information on recommended HTML usage would be a very welcome
addition to the Google App Engine Docs.

I also was unable to find anything to suggest there was a problem with
the TOS. I'm not modifying anything from Google nor am I usurping or
reverse engineering or bypassing any Google interfaces. In fact, I am
trying desperately to use a Google interface as-is and in such a
manner as is not confusing to my user population.

The frame/object *is* being served from the google.com domain. I have
no desire to nor have I made any attempt to bypass that. Depending on
the browser, there are multiple ways of verifying the source of the
frame. For example, IE's Properties and Chrome's Inspect Element
clearly show the source address.

Finally, if you have alternatives to suggest, I welcome them. I'm just
trying to do what's best for my users while staying within the limits
of the tools you provide. As evidenced by other contributors to this
thread, you can see that I am not alone in this endeavor.

On Nov 4, 1:40 am, Nick Johnson (Google) nick.john...@google.com
wrote:
 Hi,

 Framing the login page is strongly discouraged, and may in fact be contrary
 to the TOS. The only way for the user to determine that a login page for a
 Google account is legitimate is to check if it's being served off the
 google.com domain, and this is not possible inside a frame.

 -Nick Johnson



 On Mon, Nov 2, 2009 at 10:36 PM, reyelts reye...@gmail.com wrote:

  I apologize if I'm posting to the wrong place, I don't know if this is
  a basic HTML question, a Python question, a GAE question, or some
  combination of the set...

  Since we can't have much impact on the use login window for Google App
  Engine (ie to change the language or add an image), I'm looking at
  embedding the login page, like so:

  from google.appengine.ext        import webapp
  from google.appengine.api        import users

  class main(webapp.RequestHandler):
    def get(self):
        user = users.get_current_user()

       if user == None:
          self.response.out.write('html\nbody\n')
          self.response.out.write('pMy intro text/p\n')
          self.response.out.write('hr\n')
          self.response.out.write('object\n')
          self.response.out.write('  data=' + users.create_login_url
  (self.request.uri) + '\n')
          self.response.out.write('  type=text/html\n')
          self.response.out.write('  width=100% height=50%\n')
          self.response.out.write('/object')
          self.response.out.write('hr\n')
          self.response.out.write('/body\n/html\n')
       else:
          self.response.out.write('html\nbody\n')
          self.response.out.write('p' + user.nickname() + 'is logged
  in!/p\n')
          self.response.out.write('/body\n/html\n')

  This works fine: I get My intro text at the top of the window
  followed by a pane with the login. However, when I login, the result
  (user is logged in) is written to the pane where the login occurred,
  vs. replacing the whole window. I tried this with the older iframe,
  and get the same result.

  Is there a way to re-take over the complete window (ie make the frame
  I created go away) on the redirect?

 --
 Nick Johnson, Developer Programs Engineer, App Engine
 Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number:
 368047
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[google-appengine] Re: frame/object control with login

2009-11-04 Thread reyelts


I did find a rather ugly workaround. If imbed the login as an iframe
(not an object), I can use a bit of Javascript to reload the parent
page and make the iframe go away. To do this, I have the the login
redirect generates the following:

self.response.out.write('html\n')
self.response.out.write('head\n')
self.response.out.write('script type=text/javascript\n')
self.response.out.write('function test()\n')
self.response.out.write('{\n')
self.response.out.write('   if (self != parent)
parent.window.location.reload();\n')
self.response.out.write('}\n')
self.response.out.write('/script\n')
self.response.out.write('/head\n')
self.response.out.write('body onload=test();\n')
self.response.out.write('pLoading.../p\n')
self.response.out.write('/body\n')
self.response.out.write('/html\n')

On the resulting reload, I can tell that someone is logged in
(users.get_current_user()) and then proceed as normal.

The same approach works fine for an object with Chrome and Firefox.
But it does not work with IE for some reason. It seems the resulting
frame (though we're using the object tag to generate it) isn't
built with same parent-child relationship as is done under Chrome and
Firefox. Consequently, with IE, the reload() only affects the frame,
not the window. So, I do have a working solution if I'm willing to
give up adhering to XHTML Strict.
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[google-appengine] Re: Specifying App Engine Server Locations

2009-11-04 Thread Wooble


No.

On Nov 4, 11:07 am, Nick T n...@blasttheory.co.uk wrote:
 Hi - We're working on a project that requires we can specify only
 servers located within the European Union.

 Is this possible with Google App Engine?

 Thanks!
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[google-appengine] Re: ClassNotFoundException: void

2009-11-04 Thread napu


I got the same exception with JSF 2.0.1. The page showed once but when
I tried to move forward with a button click I got the exception. I
guess I'll go back to 1.2 for the time being.

/napu

On Nov 1, 2:28 am, Bryan Harper brnh...@gmail.com wrote:
 I have been playing with a fairly simple app locally with not
 problems. In my workspace I'm using google sdk 1.2.6 plugin for
 eclipse, jsf 2.0.

 The app has 2 main functions. 1 Persist user object, Delete user
 object. The persist seems to work, but the delete will sometimes
 throws the exception below. I know I didn't provide a lot of info
 about the rest of the app, but I'm really not sure where to start
 since it works fine locally. Thanks in advance for any help.

         public void persistUserRecord(User u)throws Exception{
                 PersistenceManager pm = PMF.get().getPersistenceManager();
                 pm.makePersistentAll(u);
                 pm.close();
         }

         public void deleteUserRecord(User u)throws Exception{
                 PersistenceManager pm = PMF.get().getPersistenceManager();
                 pm.deletePersistent(pm.getObjectById(User.class, u.getId()));
                 pm.close();
         }

 EXCEPTION
 javax.servlet.ServletException: java.lang.RuntimeException:
 java.lang.ClassNotFoundException: void
         at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle
 (AppVersionHandlerMap.java:240)
...

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[google-appengine] Re: Expando and Index partitioning




On Nov 4, 6:48 pm, Eli eli.jo...@gmail.com wrote:
 Stephen,

 My thinking on this is..

 Say you have a Month Column.. and it has the default lexically sorted
 asc,dsc indexes on it.

 My assumption is, when you insert a new row with a Month value
 defined, the entire index will have to be updated (no matter how many
 shards or tablets it's broken up into).


No. One new entry will be added to the ascending index bigtable, and
one new row will be added to the descending index bigtable.


 This is supported by this quote from the Index Building document you
 linked to:

 When an entity is created or deleted, all of the index rows for that
 entity must be updated.


- By 'entity' they mean a single instance of an etity, i.e. a row, not
a 'type'.

- And by 'all indexes' they mean index entries for all attributes of
that single entity, i.e. an entity with two integer attributes would
have four index entries created, 1 asc and 1 desc for each attribute.

They are just trying to draw a distinction between when an entity
which is created or deleted, and when it is updated, which they cover
in the next sentence:

However, when an existing entity is updated, the datastore determines
the delta, i.e. the properties that were changed, and only updates the
index rows that include those properties.

I guess this optimisation is worth mentioning in the docs because you
can't do an SQL-like:

update Entity set attr_1 = 42 where key = 99.

...you can only overwrite all attributes, and so you may expect this
to trigger index updates for all attributes. But no, apparently this
is optimised out.

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[google-appengine] Re: XMPP Requests

2009-11-04 Thread Kevin

ok.. and is it possible to give the bot a profile?
and a profile picture?
thanks!


On Wed, Nov 4, 2009 at 7:52 AM, Nick Johnson (Google) 
nick.john...@google.com wrote:

 Hi Kevin,

 At the moment, App Engine XMPP bots can only receive XMPP messages of types
 'normal' and 'chat'.

 -Nick Johnson


 On Fri, Oct 30, 2009 at 3:23 PM, kevinalle kevina...@gmail.com wrote:


 Hi.
 I am developing an app that uses the XMPP handler to make a chat bot..
 my question is:
 is it possible to write an iqHandler to handle other type of requests?
 i want my bot to have a profile. and to do that i need to answer to an
 xmpp request that looks like:

 iq type='get'
from='b...@shakespeare.lit/globe'
to='ham...@denmark.lit'
id='disco1'
  query 
 xmlns='http://jabber.org/protocol/disco#info'/http://jabber.org/protocol/disco#info%27/
 
 /iq

 can i write a handler for this type of request?
 thanks!
 Kevin





 --
 Nick Johnson, Developer Programs Engineer, App Engine
 Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number:
 368047

 


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[google-appengine] java mail unauthorized user

2009-11-04 Thread rasensio


I'm trying to send an email from a servlet and got this exception.

avax.servlet.ServletContext log: javax.mail.SendFailedException: Send
failure (javax.mail.MessagingException: Illegal Arguments
(java.lang.IllegalArgumentException: Unauthorized Sender: Unauthorized
sender))

my code

Properties props = new Properties();

Session session = Session.getDefaultInstance(props, null);

String msgBody = e.getMessage() == null ? e.toString() : 
e.getMessage
();

try {
Message msg = new MimeMessage(session);
msg.setFrom(new 
InternetAddress(s...@myappstop-domain));
msg.addRecipient(Message.RecipientType.TO, new 
InternetAddress
(s...@recipient.com));
msg.setSubject(some subject);
msg.setText(msgBody);
Transport.send(msg);
this.getServletContext().log(Email sent...);
} catch (Exception ex) {
this.getServletContext().log(ex.toString());
}

Any clue what should be an authorized user ???

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[google-appengine] Re: Expando and Index partitioning


I want to get our wordology clear (let me know where I am going
wrong):

A Model in AppEngine is equivalent to a Table in SQL (or, if you like,
it is equivalent to the Table Schema).

An Entity in a Model is equivalent to a Row in a Table.  (so.. a Model
is potentially a collection of Entities in the same way a Table is
potentially a collection of Rows)

Properties (of the Entities) in a Model are equivalent to Columns (of
the Rows) in a Table.

Maybe the confusion comes in with the wordage:  all of the index rows
for that entity must be updated

What is an index row?  I am assuming that an index row for a certain
property is a row entry in BigTable that contains all index
information for all Entities in the given Model that have that
property defined.

So, there would be an index row for the Month Property of your Stats
Model defined above.  And, when an Entity was inserted or Deleted for
this Stats Model, the index row for Month would have to be rebuilt.  I
am assuming they can't do a diff.. because you have to grow the
index.. there is a new Entity.

If later on you updated a few properties of this newly inserted
entity, then the datastore would know which properties were changed,
and only update the indexes for the changed properties... since the
index space has already been allocated for this new Entity in the
appropriate Index Rows.

I understand that I can be completely wrong on this.. but let me know
where the flaw in my understanding of Entities, Models and Indexes
might be.

Thanks.

On Nov 4, 4:08 pm, Stephen sdea...@gmail.com wrote:
 On Nov 4, 6:48 pm, Eli eli.jo...@gmail.com wrote:

  Stephen,

  My thinking on this is..

  Say you have a Month Column.. and it has the default lexically sorted
  asc,dsc indexes on it.

  My assumption is, when you insert a new row with a Month value
  defined, the entire index will have to be updated (no matter how many
  shards or tablets it's broken up into).

 No. One new entry will be added to the ascending index bigtable, and
 one new row will be added to the descending index bigtable.

  This is supported by this quote from the Index Building document you
  linked to:

  When an entity is created or deleted, all of the index rows for that
  entity must be updated.

 - By 'entity' they mean a single instance of an etity, i.e. a row, not
 a 'type'.

 - And by 'all indexes' they mean index entries for all attributes of
 that single entity, i.e. an entity with two integer attributes would
 have four index entries created, 1 asc and 1 desc for each attribute.

 They are just trying to draw a distinction between when an entity
 which is created or deleted, and when it is updated, which they cover
 in the next sentence:

 However, when an existing entity is updated, the datastore determines
 the delta, i.e. the properties that were changed, and only updates the
 index rows that include those properties.

 I guess this optimisation is worth mentioning in the docs because you
 can't do an SQL-like:

     update Entity set attr_1 = 42 where key = 99.

 ...you can only overwrite all attributes, and so you may expect this
 to trigger index updates for all attributes. But no, apparently this
 is optimised out.
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[google-appengine] Re: Create and adding Task objects is expensive

2009-11-04 Thread Peter


A feature we have in the pipeline is batch inserting of tasks, i.e.
inserting multiple tasks with a single API call.  This will
significantly increase the number of tasks that can be inserted in the
context of a single request.

On Nov 3, 1:07 pm, Eli eli.jo...@gmail.com wrote:
 Modify your task to allow emails to be sent out in batches 10 or 100
 or 1000 users at a time..

 This seems to be the most common approach to all bottlenecks..
 inserting to the DB.. etc.

 On Nov 2, 8:55 pm, Greg Tracy greg.tr...@att.net wrote:



  I've found that creating and adding Task objects is quite expensive.
  Consider the following...

           for u in users:
               task = Task(url='/emailqueue', params=
  {'email':u.email,'body':body})
               task.add('emailqueue')

  Each user in this loop adds another 34.5 cpu usages. It is by far
  the most expensive operation I have. Right now, I don't think it will
  scale much higher than 300 loop iterations before I start running into
  timeouts.

  Is there a better way to do this?

  Thanks.
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[google-appengine] Re: Specifying App Engine Server Locations




On Nov 4, 4:07 pm, Nick T n...@blasttheory.co.uk wrote:
 Hi - We're working on a project that requires we can specify only
 servers located within the European Union.

 Is this possible with Google App Engine?


Please star this issue:

http://code.google.com/p/googleappengine/issues/detail?id=193

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[google-appengine] Re: java mail unauthorized user

2009-11-04 Thread Tchijov Andrei


as FROM use e-mail you are using to login to your GAE account

On Nov 4, 2009, at 16:37 , rasensio wrote:


 I'm trying to send an email from a servlet and got this exception.

 avax.servlet.ServletContext log: javax.mail.SendFailedException: Send
 failure (javax.mail.MessagingException: Illegal Arguments
 (java.lang.IllegalArgumentException: Unauthorized Sender: Unauthorized
 sender))

 my code

   Properties props = new Properties();

   Session session = Session.getDefaultInstance(props, null);

   String msgBody = e.getMessage() == null ? e.toString() :  
 e.getMessage
 ();

   try {
   Message msg = new MimeMessage(session);
   msg.setFrom(new 
 InternetAddress(s...@myappstop-domain));
   msg.addRecipient(Message.RecipientType.TO, new 
 InternetAddress
 (s...@recipient.com));
   msg.setSubject(some subject);
   msg.setText(msgBody);
   Transport.send(msg);
   this.getServletContext().log(Email sent...);
   } catch (Exception ex) {
   this.getServletContext().log(ex.toString());
   }

 Any clue what should be an authorized user ???

 


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[google-appengine] Re: Specifying App Engine Server Locations

2009-11-04 Thread ego008

NO

2009/11/5 Stephen sdea...@gmail.com




 On Nov 4, 4:07 pm, Nick T n...@blasttheory.co.uk wrote:
  Hi - We're working on a project that requires we can specify only
  servers located within the European Union.
 
  Is this possible with Google App Engine?


 Please star this issue:

http://code.google.com/p/googleappengine/issues/detail?id=193

 



-- 
gae-django-cms (GD-cms)
a multi-user CMS running on GAE
sample http://gae-django-cms.appspot.com/
projects http://code.google.com/p/gae-django-cms/

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[google-appengine] Re: Expando and Index partitioning




On Nov 4, 10:20 pm, Eli eli.jo...@gmail.com wrote:
 I want to get our wordology clear (let me know where I am going
 wrong):

 A Model in AppEngine is equivalent to a Table in SQL (or, if you like,
 it is equivalent to the Table Schema).

 An Entity in a Model is equivalent to a Row in a Table.  (so.. a Model
 is potentially a collection of Entities in the same way a Table is
 potentially a collection of Rows)

 Properties (of the Entities) in a Model are equivalent to Columns (of
 the Rows) in a Table.

 Maybe the confusion comes in with the wordage:  all of the index rows
 for that entity must be updated

 What is an index row?  I am assuming that an index row for a certain
 property is a row entry in BigTable that contains all index
 information for all Entities in the given Model that have that
 property defined.

No, there is an single index row for each property of each entity.

 So, there would be an index row for the Month Property of your Stats
 Model defined above.

Yes.

 And, when an Entity was inserted or Deleted for
 this Stats Model, the index row for Month would have to be rebuilt.

No. The index rows are like the entity rows. Only the rows in the
index which correspond to the properties for that particular entity
need to be inserted/deleted.

 I understand that I can be completely wrong on this.. but let me know
 where the flaw in my understanding of Entities, Models and Indexes
 might be.


I like to think of it something like this:

create table BigTable (
key varchar primary key,
properties blob
);

All the properties are serialised (using Protocol Buffers) into the
blob. This is how you can have entities of the same type with
different properties.

When you put() an entity, the db looks at the properties blob (because
it understands the serialisation format) and if it finds eg. a single
integer property, it inserts a row into the AscendingIndexBigTable,
and another into the DescendingIndexBigTable.

The indexes could look similar to the entity table, except imagine
changing the key key to eli/E1/a1=42 for the a1 property.

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[google-appengine] Re: import os

2009-11-04 Thread Ikai L (Google)


Jairo,

You'll see DeadlineExceededError if your request takes too long to
complete. It's described here: 
http://code.google.com/appengine/docs/python/runtime.html

Is this reproducible in your development environment? What's likely
happening is that some operation or series of operations prior or
around this import are expensive and causing you to hit the time
limit. Are you doing anything before this import?

Ikai



On Nov 3, 6:57 am, Jairo Vasquez Moreno jairo.vasq...@gmail.com
wrote:
 Hi,

 Im getting a google.appengine.runtime.DeadlineExceededError error when
 I call importos.

 Is this an error?

 --
 Jairo Vasquez Moreno
 Mentez Developerwww.mentez.com
 Medellin - Colombia
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[google-appengine] Re: Expando and Index partitioning