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I am using jboss-cache and I've implemented my own cacheloader to load my data from disk. I do not need/use transactions and replication (yet).
So basicly, when the node is still in the cache I get it from memory, and not from disk. When the cache is filling up, nodes get evicted. So basicly, I have now a read-cache.
But when I put something in the cache, it is persisted immediatly through the cacheloader. Thus no write-cache.
What do you mean by write-cache ? Your CacheLoader could simply ignore the writes, and then behave as a read-cache. But then, it is up to the application to write the data back, e.g. to a DB.
Another, not related question: why does exist() behave differently than get with regard to the cache loader? If a node gets evicted, and I do a cache.exists(), it returns false, without checking the cacheloader. Why is that?
exists() doesn't acquire any locks, doesn't access the CacheLoader. Check the javadoc for exists()