[appengine-java] Re: Transactions on entities in different entity groups ?
SERIOUSLY??? (why don't you give any visibility on this key feature, like you did with FTS?) On Sep 28, 10:52 pm, Ikai Lan (Google) ika...@google.com wrote: You currently can't, but we plan on rolling out a feature that will do this in the next few releases. It's currently in trusted tester at the moment. -- Ikai Lan Developer Programs Engineer, Google App Engine plus.ikailan.com | twitter.com/ikai On Mon, Sep 26, 2011 at 10:59 PM, Santosh kumar kopp@gmail.com wrote: Hi, I want to know how to create/update the entities which are in different entity groups ? for ex: I want to update the *apple* and *carrot* entities in a transaction but those parents are not same. (Here i am in such a situation) Thanks in advance :) *S*antosh *K*umar *K* http://www.accountingguru.in/** -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: Storing query results in memcache
Hi Ian, Thanks for sharing your strategy.. I am not sure if I understand exactly how could I use your system to solve my problem. Actually, the memcache concept is working nice solving similar, but simpler situations. I think I explained poorly my situation. Here it is: An application manages contacts. It actually has thousands of them. On the GUI side we have a listview, an editview and a createview. The list view has 4 columns, and is paged (30 records per page) and by default is sorted ascending by the first column. I can search the listview by issuing queries serverside (I want the results always ordered and paged accordingly). Now, a user clicks on new contact. The application goes into createView. Data input then save. Application goes to list view. The contact should have been in the first page, but it isn't. After a few seconds, it appears. The previous example with phone numbers is kind of the same issue, but with simpler queries: User modifies a contact by adding some phone numbers. Hits save and goes to list view, then he remembers that one number was wrong and goes back to editing the same contact. The phone numbers inserted seconds ago aren't there. In this case, (since for other reasons I the phone numbers entities cannot be children of the contact entity) every phone number entity has a property called contactId that points to the father contact. The solution employed in this simple case is storing in the memcache the phone numbers by using contact-based keys so that for example [code] memcache.get(MEMCACHE_phones_contactId_1234) [/code] would give me an all the phone numbers for contact having id=1234. Somehow (too long and boring to explain how) I manage to keep this array always up to date so when the user returns lightning-fast to the editview the newly inserted phone number are there, only that they are read from the memcache. Analogically, how could this be done for the fore-mentioned listview situation, where the query is much more complex? Hope I didn't confused you more.. Thanks, Cristian -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine-java/-/3kOA7GAMTQUJ. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] allow App Engine apps to act as OAuth service providers
Would love to add a custom email password ... against my appengine service. To add this i would love to add my own oauth provider. I found this http://ikaisays.com/2011/05/26/setting-up-an-oauth-provider-on-google-app-engine/ . Question: is there an example using java? -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine-java/-/-i5DxjOXfFEJ. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: GAE - Vote counting system
Price: - with backends lets say 3 B2 machines = 350USD/Month - UrlFetch Data Sent/Received 0,15USD/GB Limit: - URL Fetch Daily Limit 46,000,000 calls this can be a problem...but I see it is possible to request an increase Write data parallel in DB: Task Queue with rate every 30second could be a solution (check timestamps in cache and write in DB) RESET counters = empty cache in Backends reset counter of object in DB Backends cache = HashMap with shared counter values or counter values without sharding (just increment value in java hashmap is fast enough) With backends we don’t need sharding I thinkwhat do you think? Thx. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: GAE - Vote counting system
It's hard to say here if we're talking about the same thing, but here's how I would do it: * Updates go through to the backend, which stores write deltas in ram (not the total). * Reads read-through memcache into the datastore. * The backend writes deltas to the datastore in batch, updating memcache, then purging the delta from memory. * The backends can write once every 5 mins or 30s or however long you're comfortable having read data be stale. More freshness == more datastore expense. It's a simple dial. This system is not limited by backend RAM since each backend stores only deltas - you can probably run the smallest size. It won't be limited by read volume, which will come almost entirely from memcache. It will be limited by max request throughput on the backend. Given the update is practically a no-op, how many QPS can a single backend serve? That's your limit (times the number of backends running). I think you'd be hard-pressed to find a better solution to this problem on GAE. It does require that reads be stale to with a controlled bound, though. Jeff On Thu, Sep 29, 2011 at 5:47 AM, Peter Dev dev133...@gmail.com wrote: Price: - with backends lets say 3 B2 machines = 350USD/Month - UrlFetch Data Sent/Received 0,15USD/GB Limit: - URL Fetch Daily Limit 46,000,000 calls this can be a problem...but I see it is possible to request an increase Write data parallel in DB: Task Queue with rate every 30second could be a solution (check timestamps in cache and write in DB) RESET counters = empty cache in Backends reset counter of object in DB Backends cache = HashMap with shared counter values or counter values without sharding (just increment value in java hashmap is fast enough) With backends we don’t need sharding I thinkwhat do you think? Thx. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] allow App Engine apps to act as OAuth service providers
There are several Java OAuth client samples referenced here: http://turbomanage.wordpress.com/2011/08/25/using-the-gae-app-identity-api-and-oauth2/ HTH, /dmc On Thu, Sep 29, 2011 at 7:20 AM, brand´s mill brandsm...@googlemail.comwrote: Would love to add a custom email password ... against my appengine service. To add this i would love to add my own oauth provider. I found this http://ikaisays.com/2011/05/26/setting-up-an-oauth-provider-on-google-app-engine/ . Question: is there an example using java? -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine-java/-/-i5DxjOXfFEJ. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- David Chandler Developer Programs Engineer, GWT+GAE w: http://code.google.com/ b: http://turbomanage.wordpress.com/ b: http://googlewebtoolkit.blogspot.com/ t: @googledevtools -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: Transactions on entities in different entity groups ?
A month or so ago Google posted a request for trusted testers for this feature. It helps to read the mailing lists :-) Jeff On Thu, Sep 29, 2011 at 2:05 AM, Cyrille Vincey cvin...@qunb.com wrote: SERIOUSLY??? (why don't you give any visibility on this key feature, like you did with FTS?) On Sep 28, 10:52 pm, Ikai Lan (Google) ika...@google.com wrote: You currently can't, but we plan on rolling out a feature that will do this in the next few releases. It's currently in trusted tester at the moment. -- Ikai Lan Developer Programs Engineer, Google App Engine plus.ikailan.com | twitter.com/ikai On Mon, Sep 26, 2011 at 10:59 PM, Santosh kumar kopp@gmail.com wrote: Hi, I want to know how to create/update the entities which are in different entity groups ? for ex: I want to update the *apple* and *carrot* entities in a transaction but those parents are not same. (Here i am in such a situation) Thanks in advance :) *S*antosh *K*umar *K* http://www.accountingguru.in/** -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Quiz
What is the output of the following method?
public boolean whatDoesItDo()
{
try
{
if(true)
{
throw new IllegalStateException();
}
return true;
}
finally
{
if(true)
{
return false;
}
}
}
Have a nice time figuring it out ;-)
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Re: [appengine-java] Quiz
That's easy. You are not supposed to return a value in the finally block
since it overwrites any previous return values and also any exceptions that
are thrown. Return statements in a finally block are a big NO-NO.
Stephen
CortexConnect.com
On Thu, Sep 29, 2011 at 3:36 PM, gk goran.kar...@googlemail.com wrote:
What is the output of the following method?
public boolean whatDoesItDo()
{
try
{
if(true)
{
throw new IllegalStateException();
}
return true;
}
finally
{
if(true)
{
return false;
}
}
}
Have a nice time figuring it out ;-)
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Re: [appengine-java] Quiz
So the answer is false. Forgot to actually state that.
On Thu, Sep 29, 2011 at 3:44 PM, Stephen Johnson onepagewo...@gmail.comwrote:
That's easy. You are not supposed to return a value in the finally block
since it overwrites any previous return values and also any exceptions that
are thrown. Return statements in a finally block are a big NO-NO.
Stephen
CortexConnect.com
On Thu, Sep 29, 2011 at 3:36 PM, gk goran.kar...@googlemail.com wrote:
What is the output of the following method?
public boolean whatDoesItDo()
{
try
{
if(true)
{
throw new IllegalStateException();
}
return true;
}
finally
{
if(true)
{
return false;
}
}
}
Have a nice time figuring it out ;-)
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[appengine-java] .A research: how long will your java app instance start up fully?
? -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Google App Engine Internet Crawler
Thank you very much for the lead . Being a newbie in appengine makes it harder for me. :D -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: .A research: how long will your java app instance start up fully?
~10s -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Quiz
Hi
return false ,finally must be excute.
On Fri, Sep 30, 2011 at 4:06 AM, gk goran.kar...@googlemail.com wrote:
What is the output of the following method?
public boolean whatDoesItDo()
{
try
{
if(true)
{
throw new IllegalStateException();
}
return true;
}
finally
{
if(true)
{
return false;
}
}
}
Have a nice time figuring it out ;-)
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Thanks Regards
R.Prabakaran
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[appengine-java] Re: .A research: how long will your java app instance start up fully?
15s On Sep 30, 9:29 am, Tapir tapir@gmail.com wrote: ? -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
