MapListener to react on the updates of the entries only once.

I'm trying to use a MapListener to react only on a change of entry once the entire cluster. The cache used is a NearCache.

I tried adding the MapListener on the BackingMap by using the following:
          NearCache cache = (NearCache) CacheFactory.getCache("MyCache");
          NamedCache backingCache = cache.getBackCache();
          backingCache.addMapListener( new MyMapListener, new MyFilter(), true);
However I noticed that the earpiece of the card receives events on 2 nodes. I guess that's because the NearCache is configured to be always 1 backup and therefore a change to an entry that happens in 2 places. Is there another way to do this?

Best regards
Jan

Hi Jan

The listener to support card receives the events on a second node if the object is transferred to this node for the repartitioning. For example, if you do a put option, you will see an input, inserted on the primary only event. After a while, if the partition is moved to another node (new primary), you'll see a deleted on the old primary input event and an evnet entry inserted on the primary again.

If you need to distinguish between user initiated events and internal consistency initiated events hen see the following code example.

http://coherence.Oracle.com/display/COH35UG/AbstractMultiplexingBackingMapListener+class+listing

Paul

Tags: Fusion Middleware

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