Is it possible to access cache inside CacheLoader.put() meth

nzamosenchuk Nov 10, 2009 8:39 AM

We have a situation, where services are connected as cacheLoaders (they are only listening persistent changes). But on put() we need to fetch some additional data from cache.
Our cache loaders are extending Your's abstract classes.
When I simply inside this method do cache.get(...) I get an exception for invalid state (java.lang.IllegalStateException: Transaction org.jboss.cache.transaction.DummyTransaction@11563ff is not in a valid state to be invoking cache operations on. - batching is enabled)

Is there any possibility to communicate cache inside CacheLoader.put(..) method?

1. Re: Is it possible to access cache inside CacheLoader.put()

galder.zamarreno Dec 2, 2009 4:44 AM (in response to nzamosenchuk)

What do you mean in your comment by " batching is enabled" ? Is this something that the exception indicated? Or something you added yourself?

In general, doing reentrant calls from the cache loader to the cache is not a good idea, particularly using cache.get() methods since these go via the interceptor chain and can create deadlocks.

Instead, what we have done in the past to access data from the cache, we have used CacheSPI.peek() calls which basically returns returns a node without accessing the interceptor chain. You can find an example in http://anonsvn.jboss.org/repos/jbosscache/core/trunk/src/main/java/org/jboss/cache/loader/ClusteredCacheLoader.java

If you're implementing a cache loader, have a look around to what is being done for other cache loaders in the JBoss Cache source code and you'll find answers to a lot of questions such as this one.
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