[infinispan-dev] Cache entry not invalidated callback?

[Manik Surtani]

On 28 Oct 2009, at 09:29, Galder Zamarreno wrote:

> Hi,
>
> Re: Porting over
> http://opensource.atlassian.com/projects/hibernate/browse/HHH-3818 to
> Infinispan 2nd level cache.
>
> For HHH-3818, Brian used the cache as a bus to notify that the cache
> contents where invalid. To do so, he implemented cache entry modified
> and invalidated callbacks that react to cache modifications or
> invalidations where the FQN is an internal fqn which contains the  
> local
> address.
>
> Now, the trick he uses for the invalidation is that on startup or
> whenever there's a view change, he establishes these internal FQNs in
> each node for each of the members in the cluster, i.e.
> fqn=/test/com/foo/test/ENTITY/NODE/127.0.0.1:39104
>
> So, in an invalidation scenario, if you a node puts something on
> /test/com/foo/test/ENTITY/NODE/127.0.0.1:39104, the other nodes have  
> at
> least /test/com/foo/test/ENTITY/NODE/127.0.0.1:39104 created on their
> caches which means that the invalidation callback works fine cos the  
> FQN
> exists in other nodes.
>
> Now, in Infinispan's case, bearing in mind that there're no FQNs, I
> could set up such keys when there's a view change too. However, I was
> thinking of another alternative.
>
> Currently, cache invalidation callback fails on Infinispan because  
> when
> you do a put on key=127.0.0.1:39104, the other nodes do not contain  
> the
> key=127.0.0.1:39104, so no invalidation callback is received. So, my
> suggestion is the following:
>
> Why not have a callback saying: "I attempted to do an invalidation on
> k=x but k=x did not exist". Maybe something like
> CacheEntryNotInvalidated callback? It looks to me that it'd be
> relatively simply to implement such notification and would simplify  
> the
> code on the Infinispan 2nd level cache provider.

Hmm, where would you impl this callback?  As a part of the core  
Infinispan notification system?
--
Manik Surtani
manik at jboss.org
Lead, Infinispan
Lead, JBoss Cache
http://www.infinispan.org
http://www.jbosscache.org