from:"romesh soni"

[appengine-java] Google App Engine NO LONGER FOR SMALL DEVELOPERS!!!!!!!

2011-09-08 Thread romesh soni

Dear Google staff and developers,

I have been using GAE since about 1.5 years and* I have some MICRO clients*.
*Usually we charge $70 / YEAR from them*. That's all we get.  If google
want, I can share 50% of it with Google. But when I see the new pricing
model, I see that I will no longer be able to use GAE and again I will have
to switch to CHEAP SHARED HOSTING. The applications have no cron job, no
data store writes (unless the user goes to contact us page and submits an
inquiry). There are not more than 5 visits per day in those sites. Even
after this, I see that the Data store Write and Read is making up to the
limit and Google will stop my site after the billing is enabled.
So at the least if I exceed the quota by this:

Datastore Writes Chargeable per DAY: $0.07
Datastore Writes Chargeable per day: $0.07

MANDATORY PER APPLICATION CHARGE: $9 PER MONTH

*So my annual billing becomes: 12*0.07 + 12*0.07 + 9*12 = $109.68*

*So I am in a loss of $ 40.*

*If Google removes the mandatory $9 per app per month charge, then I will be
on track..*

*Back to my application - As of now, there are no data store reads and
writes. I have turned off all cron jobs, and the application is almost
working as static application. But still according to the billing history
page, data store read and writes are making up to their upper free bound.
*
*I always loved and admired Google products.  But if I will have to quit
GAE, then I will think 1000 of times before clicking on any I accept the
terms and Condition.. Stuff.*

*This new pricing model has disappointed me and I believe Google completely
ignored the band of such small developers like me.
*
*Love Java, Love Google.*

Thanks
Technical Lobby

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Re: [appengine-java] Re: running app engine application totally on local environment

2011-03-17 Thread romesh soni

Thanks Didier.

Regards
Romesh

On Thu, Mar 17, 2011 at 10:21 AM, Didier Durand durand.did...@gmail.comwrote:

 Hi,

 About your second question, you'll be able to upload on the gae cloud.

 What I would do: in you data access layer, I would put some
 interceptor code that will record all changes in real time and push
 them to the gae cloud as soon as you have a connection (you say that
 internet access is shaky in that case).

 So. you will have real time mirroring of your local data to the cloud.

 The replication will happen wia the call of a servlet in the cloud
 that will receive serialized version of the modified /created object
 and put it in the datastore.

 regards

 didier

 On Mar 16, 7:12 pm, romesh soni soni.rom...@gmail.com wrote:
  Hi Didier,
 
  Thanks for your time and suggestions. Though before posting, I searched
 on
  Google to find the answer but did not find any reference :(.
  I thought the dev server means app engine support for local machine.
 
  Okay, I will use jetty for running the google app engine application I
 am
  building.
 
  But what about the other question?
   2.) uploading data from development server to production server as there
will be schedulers in local (aka development ) machines to push data to
production server so that in case of system crash on local serves, my
clients can switch to Production version.
 
  Thanks
  TL
 
  On Wed, Mar 16, 2011 at 10:33 AM, Ikai Lan (Google) ika...@google.com
 wrote:
 
   Thanks for answering, Didier (I notice you've answered this question
   several times in the past).
 
   I feel like I should add this to the FAQ ...
 
   Ikai Lan
   Developer Programs Engineer, Google App Engine
   Blog:http://googleappengine.blogspot.com
   Twitter:http://twitter.com/app_engine
   Reddit:http://www.reddit.com/r/appengine
 
   On Wed, Mar 16, 2011 at 10:13 AM, Didier Durand 
 durand.did...@gmail.comwrote:
 
   Hi, this question was already debated many times here: it is not a
   good idea to use the dev server of gae for production purposes as it
   is only a dev server as its name implies.
 
   It's limited in many functions, you have no guarantee on its long
   term, etc...
 
   Why don't you go to a standard servlet container (tomcat, jetty,
   etc..): it would be much safer for your purpose and as it is close to
   gae, you can have 2 versions in parallel or migrate back easily to gae
   in the future when needed / possible.
 
   regards
 
   didier
 
   On Mar 16, 5:07 pm, romesh soni soni.rom...@gmail.com wrote:
Did any one  have answer of my questions? I am worried.
 
Thanks
Romesh
 
On Tue, Mar 15, 2011 at 10:58 PM, romesh soni 
 soni.rom...@gmail.com
   wrote:
 Hi Group,
 
 I am building an application where my clients will be running my
 app
   engine
 application on their local environments (they can not use internet
   because
 its not stable and available all the times).  So I have two
 questions:
 
 1.) Is it possible to run an app engine application totally on
 local
   (aka
 dev) server. If yes, how to start stop the server and deploy the
 application. (I am used to of Tomcat)
 
 2.) uploading data from development server to production server as
   there
 will be schedulers in local (aka development ) machines to push
 data
   to
 production server so that in case of system crash on local serves,
 my
 clients can switch to Production version.
 
 Thanks
 TL
 
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Re: [appengine-java] Re: running app engine application totally on local environment

2011-03-16 Thread romesh soni

Hi Didier,

Thanks for your time and suggestions. Though before posting, I searched on
Google to find the answer but did not find any reference :(.
I thought the dev server means app engine support for local machine.

Okay, I will use jetty for running the google app engine application I am
building.

But what about the other question?
 2.) uploading data from development server to production server as there
  will be schedulers in local (aka development ) machines to push data to
  production server so that in case of system crash on local serves, my
  clients can switch to Production version.

Thanks
TL

On Wed, Mar 16, 2011 at 10:33 AM, Ikai Lan (Google) ika...@google.comwrote:

 Thanks for answering, Didier (I notice you've answered this question
 several times in the past).

 I feel like I should add this to the FAQ ...

 Ikai Lan
 Developer Programs Engineer, Google App Engine
 Blog: http://googleappengine.blogspot.com
 Twitter: http://twitter.com/app_engine
 Reddit: http://www.reddit.com/r/appengine



 On Wed, Mar 16, 2011 at 10:13 AM, Didier Durand 
 durand.did...@gmail.comwrote:

 Hi, this question was already debated many times here: it is not a
 good idea to use the dev server of gae for production purposes as it
 is only a dev server as its name implies.

 It's limited in many functions, you have no guarantee on its long
 term, etc...

 Why don't you go to a standard servlet container (tomcat, jetty,
 etc..): it would be much safer for your purpose and as it is close to
 gae, you can have 2 versions in parallel or migrate back easily to gae
 in the future when needed / possible.

 regards

 didier

 On Mar 16, 5:07 pm, romesh soni soni.rom...@gmail.com wrote:
  Did any one  have answer of my questions? I am worried.
 
  Thanks
  Romesh
 
  On Tue, Mar 15, 2011 at 10:58 PM, romesh soni soni.rom...@gmail.com
 wrote:
   Hi Group,
 
   I am building an application where my clients will be running my app
 engine
   application on their local environments (they can not use internet
 because
   its not stable and available all the times).  So I have two questions:
 
   1.) Is it possible to run an app engine application totally on local
 (aka
   dev) server. If yes, how to start stop the server and deploy the
   application. (I am used to of Tomcat)
 
   2.) uploading data from development server to production server as
 there
   will be schedulers in local (aka development ) machines to push data
 to
   production server so that in case of system crash on local serves, my
   clients can switch to Production version.
 
   Thanks
   TL
 
 

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[appengine-java] running app engine application totally on local environment

2011-03-15 Thread romesh soni

Hi Group,

I am building an application where my clients will be running my app engine
application on their local environments (they can not use internet because
its not stable and available all the times).  So I have two questions:

1.) Is it possible to run an app engine application totally on local (aka
dev) server. If yes, how to start stop the server and deploy the
application. (I am used to of Tomcat)

2.) uploading data from development server to production server as there
will be schedulers in local (aka development ) machines to push data to
production server so that in case of system crash on local serves, my
clients can switch to Production version.

Thanks
TL

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Re: [appengine-java] Using custom dynamic URLs in GAE Java web-app

2011-01-18 Thread romesh soni

Did you try struts2? It suits your requirement.

On Tue, Jan 18, 2011 at 1:34 PM, rsutaria rsuta...@gmail.com wrote:

Hello,

We have a requirement wherein we would like to use a dynamic URL which
is custom created based on certain values of an object in the
datastore.

We are trying to build a multi-tenant application on GAE/J where the
namespace is based on the value stored in one of the properties of the
object.

For e.g. If our landing page is: http://www.mygaejapp.com/user/login.jsp
we would then like to fwd the user to a dynamic URL such as this:
http://www.mygaejapp.com/company-name/user/enter-data.jsp

The company-name part of the URL is not part of the filesystem but
needs to dynamically added based on the properties of an object on the
login page.

I came across this module:
http://tuckey.org/urlrewrite/

but it seems here an XML needs to be updated each time a new company-
name is added and then the application needs to be reloaded in the
app-server context. This doesnt seem like a feasible and scalable
solution.

Hence, I was wondering if there are any other ways that we can
accomplish this task of being able to use dynamic URLs based on an
object property without having to update any XMLs or reloading the
application?

Also, we are trying to build an automated SaaS app, hence manual
intervention is not feasible.

Any inputs will be greatly appreciated!

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Re: [appengine-java] BlobstoreService on local dev server: usable ?

2010-10-13 Thread romesh soni

Hi Didier,
You have nothing to do anything special for using blobstore service in dev.
It seems that your app engine api is not up to date. Can you try updating
your app engine. The blobstore api has been added recently.

See what your error is saying:
package 'blobstore' or call 'DeleteBlob()' was not found.

The blobstore service fine without any issue in dev env too.

Thanks
Romesh

On Wed, Oct 13, 2010 at 1:48 PM, Didier Durand durand.did...@gmail.comwrote:

 Hi there,

 Trying to use BlobstoreService via the SDK on my local dev machine
 (Ubuntu): I get CallNotFoundException if I try to use either
 BlobstoreService.delete() or BlobstoreService.fetchData() in Junit
 tests. See trace below.

 a) is it possible BlobsotBlobstoreService in dev environment ?

 b) Do I need to do something specific to initialize or emulate it when
 being in dev as it has to be done for local DataStore ?

 thanks
 didier

 com.google.apphosting.api.ApiProxy$CallNotFoundException: The API
 package 'blobstore' or call 'DeleteBlob()' was not found.
at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:95)
at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:48)
at

 com.google.appengine.api.blobstore.BlobstoreServiceImpl.delete(BlobstoreServiceImpl.java:
 108)
at

 net.didierdurand.gwtlib.server.TestBlob.testDeleteInvalidBlob(TestBlob.java:
 37)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
 sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
 57)
at

 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
 43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.junit.runners.model.FrameworkMethod
 $1.runReflectiveCall(FrameworkMethod.java:44)
at

 org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:
 15)
at

 org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:
 41)
at

 org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:
 20)
at

 org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:
 76)
at

 org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:
 50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at

 org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:
 46)
at
 org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:
 38)
at

 org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:
 467)
at

 org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:
 683)
at

 org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:
 390)
at

 org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:
 197)



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Re: [appengine-java] Re: Blobstore upload issue (and difference between dev and prod)

2010-09-25 Thread romesh soni

Hi Guillaume ,

Why are you supplying WEB-INF path?
blobstore.createUploadUrl should contain a servlet path instead.
Implementing blobstore is quite simple and you just need to create a sevlet
and provide its url in this method. I have noticed certain differences in
using blobstore service in local and production environment.
Can you try using a servlet path in blobstore.createUploadUrl method.

Thanks
Romesh

On Sat, Sep 25, 2010 at 7:26 PM, Guillaume Laforge glafo...@gmail.comwrote:

On Sat, Sep 25, 2010 at 15:50, Guillaume Laforge glafo...@gmail.com
wrote:
[...]
I've got a form like this:

form id=upload-form

action=${blobstore.createUploadUrl('/WEB-INF/groovy/handleUpload.groovy')}
method=post enctype=multipart/form-data
accept-charset=UTF-8

Which is using the blobstore.createUploadUrl().

And for example, here, the created URL is that:

http://my-app-id.appspot.com/_ah/upload/AMmfu6a3fot9P9ypjQFlbboc2FI9nksgTAPyWUZBv1JvrFiQ_B2gwMox-pB5nBEjf_FECuellPvCoACUHTLLWlGFKxWeNSLbFbAMhnnLUeHzbbaxdbYy5FhNpD0KJSf7kCMmlGaTwByV/ALBNUaYATJ365Aa_jKXPT2sGR8J7myfzSYTY24e2/

Which corresponds to the 404 I get in my browser for...

[...]

--
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Groovy Project Manager
Head of Groovy Development at SpringSource
http://www.springsource.com/g2one

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Re: [appengine-java] Re: Blobstore upload issue (and difference between dev and prod)

2010-09-25 Thread romesh soni

Thats great to hear.

Thanks
Romesh

On Sat, Sep 25, 2010 at 10:28 PM, Guillaume Laforge glafo...@gmail.comwrote:

Hi Romesh,

On Sat, Sep 25, 2010 at 18:06, romesh soni soni.rom...@gmail.com wrote:
Hi Guillaume ,
Why are you supplying WEB-INF path?

I'm using Gaelyk, and I can reference the groovlets (ie. Groovy
scripts which are served by a Servlet) using their path.
Interestingly, it was working totally fine that way.
The Groovlet servlet catches all the *.groovy URIs and finds the
script to call itself, and using WEB-INF or not didn't really
matter... at least locally.
And as you gave me that hint... I tried using the path
/handleUpload.groovy (which will search in /WEB-INF/groovy anyway),
and it worked both locally and on app engine!!!
Thanks a lot for that hint :-)

blobstore.createUploadUrl should contain a servlet path instead.

The nice thing about Gaelyk is that you just write scripts, you don't
have to write servlets per se.
And the URL I was using was of the form *.groovy, which were to be
handled by the main Groovlet servlet.

Implementing blobstore is quite simple and you just need to create a
sevlet
and provide its url in this method.
I have noticed certain differences in
using blobstore service in local and production environment.

This is indeed a bit painful those differences, as you can spend a lot
of time wondering what's going on without really figuring out :-(
I hope in the future, such differences will go away!

What other differences have you spotted?

Can you try using a servlet path in blobstore.createUploadUrl method.

Using /handleUpload.groovy which is taken care of by the main
servlet worked fine.

Thanks for your help :-)

Guillaume

Thanks
Romesh

On Sat, Sep 25, 2010 at 7:26 PM, Guillaume Laforge glafo...@gmail.com
wrote:

On Sat, Sep 25, 2010 at 15:50, Guillaume Laforge glafo...@gmail.com
wrote:
[...]
I've got a form like this:

form id=upload-form

action=${blobstore.createUploadUrl('/WEB-INF/groovy/handleUpload.groovy')}
method=post enctype=multipart/form-data
accept-charset=UTF-8

Which is using the blobstore.createUploadUrl().

And for example, here, the created URL is that:

Which corresponds to the 404 I get in my browser for...

[...]

--
Guillaume Laforge
Groovy Project Manager
Head of Groovy Development at SpringSource
http://www.springsource.com/g2one

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Re: [appengine-java] JDO - Update Partial Attributes In a Persistent Object

2010-09-23 Thread romesh soni

Hi Luka,

How are you updating the object without having a reference of actual object
to be updated. In such case, you should be first retrieving the actual
object from db and then change the attributes and then save that object.
This process doesn't result in any loss of data and you get what you want.

Thanks
Romesh

On Thu, Sep 23, 2010 at 5:40 PM, luka uluk...@gmail.com wrote:

Hi,

I have some JDO persistent objects which contains lots of attributes.
So in some cases I use specific Fetch Groups and retrieve only some
attributes which are relevant.
In these cases when I change the attributes which I retrieved and try
to update them the rest
of the attributes (which I did not retrieved) are being reset to null.

Can I update only partial attributes in a JDO persisted object?

Re: [appengine-java] Re: session management

2010-05-28 Thread romesh soni

Hi Stephan,
Is that possible that a client had closed the browser and opens a new
browser and we can still identify the client using session cookies?

Thanks
Romesh

On Thu, May 27, 2010 at 10:42 PM, Stephan Hartmann hartm...@metamesh.dewrote:

Keep in mind that sessions managed by the servlet container expire after a
specific time of inactivity on the server side, so if a user comes back
after a while with his old session cookie, he will still get a new session.
According to the servlet spec, you can obtain this value with
HttpSession.getMaxInactiveInterval() and change it with
HttpSession.setMaxInactiveInterval(int), with a value of -1 meaning never to
expire.

Regards,
Stephan

2010/5/27 lembas keremo...@gmail.com

thanks romesh. I was on vacation did not see your message. sorry for a
late answer.

I do not use cookies for managing session. Google does. JESSIONID
cookies is created on server by App Engine anyway. I just extend its
expiration date.
Is it possible to implement remember me functionality without
cookies?

On May 3, 11:22 am, romesh soni soni.rom...@gmail.com wrote:
Hey Ikai, sorry I referred you by mistake.. My msg was for lembas

On Mon, May 3, 2010 at 1:23 PM, romesh soni soni.rom...@gmail.com
wrote:
Hi Ikai,

the way you are managing session is not good. actually you are using
cookies for managing session, which is not a good thing.
instead session management is done at server side, not client side.

On Mon, May 3, 2010 at 1:18 PM, Ikai L (Google) ika...@google.com
wrote:

I'm not sure how this mitigates use of the _ah_session records that
are
created. Anytime you set an attribute, it will use this. If you're
worried
about _ah_session getting out of control, a better way would be to
use
Memcache for session data and associate it with a cookie. Stale,
unused
session data will be automatically expired. The advantage of using
the built
in sessions is that since they are backed by both Memcache and the
datastore, they're going to be less volatile.

On Sun, May 2, 2010 at 8:46 AM, lembas keremo...@gmail.com wrote:

I have couple of questions about session management. I use GWT+GAE.
I
do not want my _ah_sessions table to be out of control. I do not
want
to generate unnecessary sessions.

I have sessions-enabledtrue/sessions-enabled in my appengine-
web.xml.

1.I have the following code at the beginning of my onModuleLoad()
method, is it ok?
String sessionid = Cookies.getCookie(JSESSIONID);
if (sessionid != null) {
Date now = new Date();
Date expires = new Date(now.getTime() + (long) 1000 * 60 * 60
* 24
*
365);
Cookies.setCookie(JSESSIONID, sessionid, expires);
}

2.After the user sends his/her usernamepassword to the server for
the
first time (i.e. with a new JSESSIONID cookie), I get that user
object from database and if I have it, I save it using:
getThreadLocalRequest().getSession().setAttribute(user, user);
and send it to the client as a sign of a succesful login.

So next time client visits the site with the same JSESSIONID I can
get
the user object directly by:
getThreadLocalRequest().getSession().getAttribute(user);

---

Is it ok how I use the sesssion management? Is it true that every
request comes with the same JSESSIONID (unless client deleted it
deliberately), no new session is created on server and server do not
need to access database to get the user object?

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Re: [appengine-java] Re: session management

2010-05-27 Thread romesh soni

Hi Keremonal,

As my practice I don't depend on Cookies for session management, because if
cookie is disabled at client browser then you will always get a new session
id and your data which was previously stored in session gets lost. As I
think _ahsession is a very good thing for session mgmt. The only concern we
see with it is its growing size. I would suggest you to use _ahsession for
session mgmt and create a cron job to automatically delete session entries
from _ahsession:

public class SessionCleanup extends StandardServlet {

   private static final long serialVersionUID =
7896915936685966869L;
   private static final Logger logger =
Logger.getLogger(SessionCleanup.class.getName());
   private Cache cache = null;
   private static final String EXPIRES = _expires;

   @Override
   public void init() throws ServletException {
   try {
   final CacheFactory cacheFactory =
CacheManager.getInstance().getCacheFactory();
   cache =
cacheFactory.createCache(Collections.emptyMap());
   } catch (final CacheException e) {
   logger.log(Level.SEVERE, failed to configure
cache, e);
   }
   }

   @Override
   protected void processRequest(final HttpServletRequest
request, final HttpServletResponse response) throws ServletException,
   IOException {

   final long now = new Date().getTime();
   final DatastoreService datastore =
DatastoreServiceFactory.getDatastoreService();
   final Query query = new Query(_ah_SESSION);

   // TODO make this a task
   for (final Entity session :
datastore.prepare(query).asIterable(FetchOptions.Builder.withLimit(100)))
{
   Long expires = (Long)
session.getProperty(EXPIRES);
   if (expires  now) {
   final Key key = session.getKey();
   datastore.delete(key);
   final StringBuilder sb = new
StringBuilder(Removed session with expiration ).append((new
Date(expires)).toString());
   if (cache != null)
   if
(cache.containsKey(key.getName())) {

cache.remove(key.getName());
   sb.append(, also from
memcache);
   }
   logger.log(Level.INFO, sb.toString());
   }
   }

   }

}

Thanks
Romesh


On Thu, May 27, 2010 at 1:28 PM, lembas keremo...@gmail.com wrote:

 thanks romesh. I was on vacation did not see your message. sorry for a
 late answer.

 I do not use cookies for managing session. Google does. JESSIONID
 cookies is created on server by App Engine anyway. I just extend its
 expiration date.
 Is it possible to implement remember me functionality without
 cookies?

 On May 3, 11:22 am, romesh soni soni.rom...@gmail.com wrote:
  Hey Ikai, sorry I referred you by mistake.. My msg was for lembas
 
 
 
  On Mon, May 3, 2010 at 1:23 PM, romesh soni soni.rom...@gmail.com
 wrote:
   Hi Ikai,
 
   the way you are managing session is not good. actually you are using
   cookies for managing session, which is not a good thing.
   instead session management is done at server side, not client side.
 
   On Mon, May 3, 2010 at 1:18 PM, Ikai L (Google) ika...@google.com
 wrote:
 
   I'm not sure how this mitigates use of the _ah_session records that
 are
   created. Anytime you set an attribute, it will use this. If you're
 worried
   about _ah_session getting out of control, a better way would be to use
   Memcache for session data and associate it with a cookie. Stale,
 unused
   session data will be automatically expired. The advantage of using the
 built
   in sessions is that since they are backed by both Memcache and the
   datastore, they're going to be less volatile.
 
   On Sun, May 2, 2010 at 8:46 AM, lembas keremo...@gmail.com wrote:
 
   I have couple of questions about session management. I use GWT+GAE. I
   do not want my _ah_sessions table to be out of control. I do not want
   to generate unnecessary sessions.
 
   I have sessions-enabledtrue/sessions-enabled in my appengine-
   web.xml.
 
   1.I have the following code at the beginning of my onModuleLoad()
   method, is it ok?
   String sessionid = Cookies.getCookie(JSESSIONID);
   if (sessionid != null) {
  Date now = new Date();
  Date expires = new Date(now.getTime() + (long) 1000 * 60 * 60
 * 24
   *
   365);
  Cookies.setCookie(JSESSIONID, sessionid, expires);
   }
 
   2.After the user sends his/her usernamepassword to the server for
 the
   first time (i.e. with a new JSESSIONID cookie), I get that user
   object from database and if I have it, I save it using:
   getThreadLocalRequest().getSession().setAttribute(user, user);
   and send it to the client as a sign

Re: [appengine-java] Re: session management

2010-05-27 Thread romesh soni

Cookies are the most suitable thing for the remember me functionality best
works. Because sessions end with the end of browser window and cookies still
survive (if specified long life)

Romesh

On Thu, May 27, 2010 at 1:28 PM, lembas keremo...@gmail.com wrote:

thanks romesh. I was on vacation did not see your message. sorry for a
late answer.

On May 3, 11:22 am, romesh soni soni.rom...@gmail.com wrote:
Hey Ikai, sorry I referred you by mistake.. My msg was for lembas

On Mon, May 3, 2010 at 1:23 PM, romesh soni soni.rom...@gmail.com
wrote:
Hi Ikai,

the way you are managing session is not good. actually you are using
cookies for managing session, which is not a good thing.
instead session management is done at server side, not client side.

On Mon, May 3, 2010 at 1:18 PM, Ikai L (Google) ika...@google.com
wrote:

I'm not sure how this mitigates use of the _ah_session records that
are
created. Anytime you set an attribute, it will use this. If you're
worried
about _ah_session getting out of control, a better way would be to use
Memcache for session data and associate it with a cookie. Stale,
unused
session data will be automatically expired. The advantage of using the
built
in sessions is that since they are backed by both Memcache and the
datastore, they're going to be less volatile.

On Sun, May 2, 2010 at 8:46 AM, lembas keremo...@gmail.com wrote:

I have couple of questions about session management. I use GWT+GAE. I
do not want my _ah_sessions table to be out of control. I do not want
to generate unnecessary sessions.

I have sessions-enabledtrue/sessions-enabled in my appengine-
web.xml.

So next time client visits the site with the same JSESSIONID I can
get
the user object directly by:
getThreadLocalRequest().getSession().getAttribute(user);

---

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Google App Engine links:
Blog:http://googleappengine.blogspot.com
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Re: [appengine-java] session-enabled false and JSESSIONID

2010-05-17 Thread romesh soni

hello Sergio
*
*
*This is not an issue. disabling session id in code will not stop the cookie
from saving session id. When you enable session in app engine xml file than
you are telling the framework that you don't want to save sessions in
cookies (client side), instead you want to save them on server i.e. using
_ah_session. Cookies JSession id is default behavior of Java session mgmt.
And it is nothing to do with APP engine framework.*
*
*
*thanks*
*romesh*
*
*
On Mon, May 17, 2010 at 11:19 AM, Sergio Lopes slo...@gmail.com wrote:

Hi everybody

I'm trying to make a completely stateless application. I configured
session-enabled to false and it seems that sessions are not being
created in server side (the datastore _ah_session table is not growing
anymore). But all requests are setting the JSESSIONID cookie. Why?
There is no session support...

Is this a bug? Should I fill this in issue tracker?

Thanks
Sérgio

Re: [appengine-java] Multilingual storing data

2010-05-07 Thread romesh soni

Are you sure the data is getting in proper format to the sever for getting
saved? I mean have you used the utf-8 specification for your pages?

Romesh

On Fri, May 7, 2010 at 2:59 PM, Henry enricrequ...@gmail.com wrote:

 Hi Guys,

 I've a simple question, I'm using Java App Engine and I need to store
 multilingual data like 'ñ' character.
 Storing it as a unicode String, when I retrieve it, I'm getting the
 following one '?'.

 Does any one know how to store them? I need to store data with
 different languages.

 Thanks in advance.

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Re: [appengine-java] Re: Inequality Filters Are Allowed On One Property Only

2010-05-04 Thread romesh soni

Hey Tristan,

Seems you have got it solved. Thanks. I think it should work for me without
any issues. I will let you know once I implement it.
You have a good logic man. Can I add you on Gmail?

Thanks and Regards
Romesh

On Tue, May 4, 2010 at 7:08 PM, Tristan Slominski 
tristan.slomin...@gmail.com wrote:

 Yes, but then you just do a test on the entity you got from the query (one
 test on one entity, fast)

 so add a last step.. using previous logic you end up with x2=71 y2=75
 final step will beis (z of 76)  (y2 of 75)   if no... no results..
 if yes... have 1 result

 that should solve that part


 On Tue, May 4, 2010 at 02:04, romesh soni soni.rom...@gmail.com wrote:

 Hi Tristan,

 Really appreciate the logic you suggested.  But consider this case:

 There are only two intervals in db: x1 = 4   y1 = 70   and  x2 = 71   y2 =
 75.

 I want to search by 76. The 76 doesn't fall in any category but still the
 query will return the second interval, which is not correct.
 Instead the query should say that there is no matching interval. Am I
 correct?

 Regards
 Romesh


 On Tue, May 4, 2010 at 11:09 AM, Tristan Slominski 
 tristan.slomin...@gmail.com wrote:

 in that case the solution to your dilemma is as follows

 query.addFilter(x, FilterOptions.LESS_THAN, z);
 query.addSort(x, SortOrder.DESC);

 then execute the query with a limit of 1
 that is the answer you seek

 in other words...

 assume you have two intervalsx1 = 4   y1 = 70   and  x2 = 71   y2 =
 75.
 you want to find interval that matches your condition ofx  74  y

 add filter for x less than 74 will give you two results where x1=4 in
 first result and x2=71 in second result
 now sort these results descending so that x2 is the first result   x2=71
 x1=4
 set limit of 1 gives your query a result of x2

 you don't need property y

 does that work for you?

 On Mon, May 3, 2010 at 22:45, romesh soni soni.rom...@gmail.com wrote:

 Hi Tristan,

 You got a good catch. But the code which populates the data will never
 let this happen. If there is a pair x = 4 and y = 10, then there will be no
 such other pair which consist values between 4 and 10. there will be one 
 and
 only one set for values 4,5,6,7,8,9,10 and that will be (4,10). I hope my
 explanation is helpful. So it is guaranteed of having one solution per
 query.

 On Mon, May 3, 2010 at 7:31 PM, Tristan Slominski 
 tristan.slomin...@gmail.com wrote:

 Hey, so I've been thinking about the problem description... you
 mentioned that there will ever only be one solution for the query, but 
 that
 doesn't seem like a valid constraint. For example, let x = 4 and y = 10, 
 let
 x2 = 5 and y2 = 11.  The value of z = 6 will result in two solutions.

 The reason I am asking, is that the contraint of only one solution
 existing suggest a different mapping of solutions than the one you 
 suggested
 (not sure what that different approach would be yet, but it could be
 something along the lines of enumerating the intervals).

 Can you guarantee the constraint of only one solution per query?

 On May 3, 2010 3:01 AM, romesh soni soni.rom...@gmail.com wrote:

 Hi Thomas,

 the possible value of x and y can be 2020 and 203204206207.
 do you see that it is possible to make such thing in 5000 element
 limitation. Are you talking of ArrayList?

 Your solution is good for small list, but I am afraid that it will not
 suit my requirement..




 On Mon, May 3, 2010 at 1:00 PM, Thomas mylee...@gmail.com wrote:
 
  Hi romesh:
 
 Datastor...

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Re: [appengine-java] Re: Inequality Filters Are Allowed On One Property Only

2010-05-03 Thread romesh soni

Thomas,

it is possible to pre-determine the solution list for given lower and upper
bounds x and y. But there can be enormous rows for a given (x,y) pair. And
there will be enormous rows containing (x,y) pairs. So I can not keep a
predetermined list.

Regards
Romesh

On Mon, May 3, 2010 at 5:52 AM, Thomas mylee...@gmail.com wrote:

I can't imagine what your data is. Is it possible to pre-solve the
solution list z for every (x, y) pair and store them like (x, y, list
of z). If it is the case, you can use a simple z=somevalue filter to
get your single result.

Thomas

On 5月2日, 下午4時57分, romesh soni soni.rom...@gmail.com wrote:
Tristan,

sorry for the mistake. I wrote the wrong thing ( I realized this at night
when I went to bed for sleep)
It is field1=1000=field2. A given value will always be between the
lower
and upper bound (field1 and field2).

Thanks
Romesh

On Sun, May 2, 2010 at 11:20 AM, Tristan tristan.slomin...@gmail.com
wrote:

did you make an error or are you describing this condition?

1000 = field1 = field2 = 1000

On May 1, 10:26 am, romesh soni soni.rom...@gmail.com wrote:
OK, let me explain the query which I need to run (I am putting the
sql
server syntax for it, thats what I was working so far):
select * from mytable where field1=1000 and field2=1000;

Thats what I need to run on on datastore.

Field1 and field 2 are have a relation. More specifically, Field1
=field
2. My db is such that when I search for any given integer say 1000,
then
the
db will return only one row for given condition : field1=1000 and
field2=1000;

Regards,
Romesh..

On Sat, May 1, 2010 at 4:42 PM, Tristan tristan.slomin...@gmail.com

wrote:
Hey,

So, there's no more 1000 query limitation, that went away (unless
it
was put back in).

I see what you're saying though. Need to know more about what the
problem is. I assume x and z are the two properties? It seems that
x
and z are correlated (since you guarantee that there is only one
solution that meets the criteria). This correlation can probably be
exploited to better solve the problem, but I need some constraints
to
work with. What is the relationship between x and z that guarantees
you will have only one solution?

Tristan

On May 1, 2:30 am, romesh soni soni.rom...@gmail.com wrote:
Hi Tristan,
The solution you provided is the best one among of those which I
have
found
so far. But this is not what I was looking for, my database is
quite
large
and its will grow continuously to millions of records in time.
But
there
will be only 1 matching record for my filter (x=y and y=z) If I
try
your
suggested approach, then I will have to scan all records in
loop.(1000
limitation)

On Fri, Apr 30, 2010 at 6:58 PM, Romesh soni.rom...@gmail.com
wrote:
I have been trying to find a workaround for this limitation and
spent
2 days and read almost all blogs, discussion
groups., but can not find a solution to it.
Has
any one able to find a way to handle this limitation? (The List
property solution doesn't work.)

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Re: [appengine-java] session management

2010-05-03 Thread romesh soni

Hi Ikai,

the way you are managing session is not good. actually you are using cookies
for managing session, which is not a good thing.
instead session management is done at server side, not client side.

On Mon, May 3, 2010 at 1:18 PM, Ikai L (Google) ika...@google.com wrote:

I'm not sure how this mitigates use of the _ah_session records that are
created. Anytime you set an attribute, it will use this. If you're worried
about _ah_session getting out of control, a better way would be to use
Memcache for session data and associate it with a cookie. Stale, unused
session data will be automatically expired. The advantage of using the built
in sessions is that since they are backed by both Memcache and the
datastore, they're going to be less volatile.

On Sun, May 2, 2010 at 8:46 AM, lembas keremo...@gmail.com wrote:

I have couple of questions about session management. I use GWT+GAE. I
do not want my _ah_sessions table to be out of control. I do not want
to generate unnecessary sessions.

I have sessions-enabledtrue/sessions-enabled in my appengine-
web.xml.

1.I have the following code at the beginning of my onModuleLoad()
method, is it ok?
String sessionid = Cookies.getCookie(JSESSIONID);
if (sessionid != null) {
Date now = new Date();
Date expires = new Date(now.getTime() + (long) 1000 * 60 * 60 * 24
*
365);
Cookies.setCookie(JSESSIONID, sessionid, expires);
}

2.After the user sends his/her usernamepassword to the server for the
first time (i.e. with a new JSESSIONID cookie), I get that user
object from database and if I have it, I save it using:
getThreadLocalRequest().getSession().setAttribute(user, user);
and send it to the client as a sign of a succesful login.

So next time client visits the site with the same JSESSIONID I can get
the user object directly by:
getThreadLocalRequest().getSession().getAttribute(user);

---

--
Ikai Lan
Developer Relations, Google App Engine
Twitter: http://twitter.com/ikai
Delicious: http://delicious.com/ikailan

Google App Engine links:
Blog: http://googleappengine.blogspot.com
Twitter: http://twitter.com/app_engine
Reddit: http://www.reddit.com/r/appengine

Re: [appengine-java] Re: Inequality Filters Are Allowed On One Property Only

2010-05-03 Thread romesh soni

Hi Thomas,

the possible value of x and y can be 2020 and 203204206207.
do you see that it is possible to make such thing in 5000 element
limitation. Are you talking of ArrayList?

Your solution is good for small list, but I am afraid that it will not suit
my requirement..

On Mon, May 3, 2010 at 1:00 PM, Thomas mylee...@gmail.com wrote:

Hi romesh:

Datastore allows multi-value property. So you can have each (x,y,
list of possible z) in only one row and the filter is as simple as
where z=some-value. The only limitation is that list-of-z can not
exceed 5000 elements.

Thomas

On 5月3日, 下午2時02分, romesh soni soni.rom...@gmail.com wrote:
Thomas,

it is possible to pre-determine the solution list for given lower and
upper
bounds x and y. But there can be enormous rows for a given (x,y) pair.
And
there will be enormous rows containing (x,y) pairs. So I can not keep a
predetermined list.

Re: [appengine-java] session management

2010-05-03 Thread romesh soni

Hey Ikai, sorry I referred you by mistake.. My msg was for lembas

On Mon, May 3, 2010 at 1:23 PM, romesh soni soni.rom...@gmail.com wrote: