[jboss-user] [JBossCache] - Re: Hibernate/Cache conceptual mismatch

[steve.ebersole@jboss.com]

Just to clarify my last comment.  Keep in mind that putFromExternalRead() always results from the following usage pattern:

Object state = readFromCache();
if ( state == null ) {
    state = readFromExternal();
    putIntoCache( state );
}
...

In Hibernate terms, readFromExternal is causing the data to get read from the database because it was not found in the cache.  That db-read data is always the "truth" in a db-driven app...

The only way that data should not overwrite the current node data (putIntoCache) is if suddenly there has been a write lock applied to the node between readFromCache() and putIntoCache() being executed (which is the meaning of my "intention lock" comment).

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