Adapting Cayenne to GAE/J

[Juan José Gil <ma...@gmail.com>]

Hi, I was looking for messages where this theme was discussed, but its been 
more than a year since last chat about it.

Is there someone trying to adapt cayenne to run on GAE/J?

If not, were can I read about defining datanodes or a dbadapter, I'm thinking 
on defining somethin to "start" with, using only the "static mapping abilities" 
of cayenne (covering only properties), and from there see how to implement the 
bast and powerfull api of cayenne :)

Do some of you found it interesting?

Re: Adapting Cayenne to GAE/J

[Andrus Adamchik <an...@objectstyle.org>]

On Aug 19, 2010, at 7:38 PM, Andrei Ionescu wrote:

> I guess I forgot about threading as there are some GAE/J restrictions there too:
>  http://en.wikipedia.org/wiki/Google_App_Engine#Restrictions

This is where 3.1 IoC features may come handy... E.g. to redefine an EventManager to be noop/single-threaded, and to reimplement other possible conflicting pieces.

Andrus

Re: Adapting Cayenne to GAE/J

[Andrei Ionescu <ai...@yahoo.com>]

>> It looks like this was done by replacing calls to the file system with
>> in-memory implementations + an init filter to be used for GAE/J,
>> so maybe some similar approach would work for Cayenne too?
> It should.   File system dependencies are the primary issue with
 >
> getting GAE apps working.   I think H2 Database now works under GAE,
> so that would probably be a good starting DB to be testing Cayenne
> against in that environment.
I guess I forgot about threading as there are some GAE/J restrictions 
there too:
   http://en.wikipedia.org/wiki/Google_App_Engine#Restrictions

Other frameworks solved this by using some java.util.concurrent.* 
alternatives, as these classes are whitelisted:
   http://code.google.com/appengine/docs/java/jrewhitelist.html

regards,
Andrei.

Re: Adapting Cayenne to GAE/J

[Mike Kienenberger <mk...@gmail.com>]

It should.   File system dependencies are the primary issue with
getting GAE apps working.   I think H2 Database now works under GAE,
so that would probably be a good starting DB to be testing Cayenne
against in that environment.

On Wed, Aug 18, 2010 at 5:52 AM, Andrei Ionescu <ai...@yahoo.com> wrote:
> It looks like this was done by replacing calls to the file system with
> in-memory implementations + an init filter to be used for GAE/J,
> so maybe some similar approach would work for Cayenne too?

Re: Adapting Cayenne to GAE/J

[Andrei Ionescu <ai...@yahoo.com>]

> I know some folks who were looking it this privately, but AFAIK no code has come out of this effort yet, so yes,
> this task is up for grabs and it would be cool if someone makes it happen.
+1.
Bob Schellink managed to update Click to make it run on GAE/J, and it 
would be really cool to have Cayenne running there too, since for many 
projects Click+Cayenne is the default choice.
See more here how it's done:
http://click.apache.org/docs/extras-api/org/apache/click/extras/gae/package-summary.html
and some live Click examples running on GAE/J here:
http://click-jquery.appspot.com/

It looks like this was done by replacing calls to the file system with 
in-memory implementations + an init filter to be used for GAE/J,
so maybe some similar approach would work for Cayenne too?

regards,
Andrei.

Re: Adapting Cayenne to GAE/J

[Andrus Adamchik <an...@objectstyle.org>]

Hi,

I know some folks who were looking it this privately, but AFAIK no code has come out of this effort yet, so yes, this task is up for grabs and it would be cool if someone makes it happen.

Cheers,
Andrus


On Aug 18, 2010, at 2:34 AM, Juan José Gil wrote:
> Hi, I was looking for messages where this theme was discussed, but its been 
> more than a year since last chat about it.
> 
> Is there someone trying to adapt cayenne to run on GAE/J?
> 
> If not, were can I read about defining datanodes or a dbadapter, I'm thinking 
> on defining somethin to "start" with, using only the "static mapping abilities" 
> of cayenne (covering only properties), and from there see how to implement the 
> bast and powerfull api of cayenne :)
> 
> Do some of you found it interesting?
>