Hi Maurice,

Am 06.06.2012 um 14:30 schrieb Mauricio S. Castro:

I am trying to use QueryProcessor to compile and cache for later, in case no used modules have changed, is this ok?

I suppose this will not work, unfortunatedly: the query processor contains some (dynamically evaluated like databases to access) yet stateful information that makes it impossible to cache.

Can I concurrently use QueryProcessor within the same JVM in different threads?

For those very reasons I'd suggest you to use ThreadLocals [1] and a dedicated processor per Thread; that way you are definitely on the safe side.

Creating an instance of QueryProcessor should be a rather lightweight operation, as such I hope this suits your needs.

I hope this helped, feel free to ask for more!

Kind regards Michael

[1] http://docs.oracle.com/javase/6/docs/api/java/lang/ThreadLocal.html