Cache : incr() problem between implementation

[jsh]

Hello,

I am facing a problem with the Play Cache. When using the incr(myKey) method, the cache content type must be different according to the cache implementation used.
When using the default ehCache implementation, the cache entry pointed by the key must be a numeric type (integer...) otherwise I get an exception:

Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number
        at play.cache.EhCacheImpl.incr(EhCacheImpl.java:92)
        at play.cache.Cache.incr(Cache.java:146)

When using the memcached implementation the content must be a String..., otherwise I get that exception:

OperationException: CLIENT: CLIENT_ERROR cannot increment or decrement non-numeric value
        at net.spy.memcached.protocol.BaseOperationImpl.handleError(BaseOperationImpl.java:126)

Any idea on what I am supposed to do to be able to switch cache implementation at will?

Cheers.
Jérôme

[jsh]

Ok found this https://bugs.launchpad.net/play/+bug/503349 that seems to explain that the memcached client (spymemcached) is buggy.

[Julien Tournay]

Hi,

The problem with memcached is due to a (stupid ?) "optimization" made by the java client used by play.

Basically, all memcached client will encode Numbers to save space on the memcached server.

Problem is, since the stored values are "encoded", memcached is unable to incr or decr...

Last time I checked, this "feature" was not optional, in any of the clients.

jto.

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[Marc Deschamps]

Give a try to Hazelcast module, incr and decr use AtomicNumber.

play install hazelcast-0.2.2

http://www.playframework.org/modules/hazelcast

:-)

[jsh]

Yes, great, thanks.

But my concern was to have the same code working with all underlying implementation of the cache.
It seems we should not use incr() or decr() for that.