[jboss-user] [JBoss Cache: Core Edition] - Re: Strange invalidation

[bstansberry@jboss.com]

The trick to having the same info stored in multiple nodes while using invalidation is to have logic to differentiate two types of writes to the cache.  Here I'll use terminology from Hibernate's Second Level Caching implementation, which faces this exact problem:

1) A "put".  This is a write to JBC of data that's stored elsewhere in a "master" source (e.g. a database) and is unchanged from that master source. Storing this in JBC shouldn't invalidate other nodes, since other nodes will also have the same data from the same "master" source.

To make this kind of write to JBC, use the JBC putForExternalRead() method.

2) An "insert/update".  Here the application is changing the master data and needs to make the cache aware of the change. Since other nodes in the cluster may also have now out-of-date copies of the data cached, they need to be invalidated.

To make this kind of write to JBC, use the JBC put() method.

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