Re: [eclipselink-users] using another L2 cache implementation

[Tom Ware <tom.ware@xxxxxxxxxx>]

Hi Yannick,

  I've been trying to track down an example for you to look at, but 
unfortunately there is not one in the open source product.

  The idea is that you subclass CacheInterceptor.  Unfortunately, you will have 
to override pretty much every method if you are completely replacing the cache. 
 We have been trying to figure out how to make this it easier to plug in 
another cache, but unfortunately that work is still in the discussion stages.

  CacheInterceptor is designed to replace the identity map, and there is no 
reason you need the target identity map.  You will be replacing every reference 
to targetIdentityMap in the CacheInterceptor code with a call into your caching 
solution.

  I appologize that is code is not easily overridable at the moment.  Hopefully 
in a future version we'll have a more user-friendly solution.

-Tom

Yannick Majoros wrote:
>  Hi,
>
> Thanks!
>
> Just had a look at the source. It could be what I need.
>
> So, what should I do to delegate all caching to, say, ehcache? I guess I 
> should subclass CacheInterceptor and override some specific method (if 
> not about everything). What confuses me is the targetIdentityMap. Should 
> I refer to that in all cases, or could I just implement IdentityMap the 
> way I want and never refer to targetIdentityMap?
>
> Regards,
>
> Yannick
>
>
> Le 18/07/2011 14:52, Tom Ware a écrit :
> > Hi Yannick,
> >
> >   There is no general JPA way of replacing the cache implementation.
> >
> >   EclipseLink offers the possibility of implementation a 
> > CacheInterceptor.  You provide an implementation of that class that 
> > takes the appropriate action when EclipseLink makes calls into the cache.
> >
> >   Here's the javadoc:
> >
> > http://www.eclipse.org/eclipselink/api/2.3/org/eclipse/persistence/sessions/interceptors/CacheInterceptor.html 
> >
> >
> >   If you need help implementing, you can get it on this list.
> >
> > -Tom
> >
> > Yannick Majoros wrote:
> > >  Hi,
> > >
> > > Is there a way to use another L2 cache implementation? I'd like to 
> > > use some shared cache between multiple servers (ehcache or other). If 
> > > possible, I'd like to use JPA 2 interfaces rather than 
> > > eclipselink-specific ones, but the latter is also an option if it's 
> > > simple enough, or documented/supported.
> > >
> > > Regards,
> > >
> > > Yannick Majoros
> > > _______________________________________________
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> > > eclipselink-users@xxxxxxxxxxx
> > > https://dev.eclipse.org/mailman/listinfo/eclipselink-users
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>
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