Java Tuplebase Access
Initially I provided Java access to a tuplebase instance by implementing Java classes whose most interesting methods were marked as native, and thus invoked via JNI. This was very powerful because Java could use any tuplebase implementation simply by calling the appropriate factory function and I could expose any existing C++ functionality simply by implementing the appropriate JNI glue.
But native code can't be included with unsigned applets, so I ported ZTBRep_Client from C++ to Java. ZTBRep_Client is the most useful tuplebase implementation in that it talks to a ZTBServer instance on the end of a comms link, generally a network socket. It's also fairly large, and the async nature of the protocol makes things somewhat tricky. The normal Java synchronization model is based around monitors, which are not directly useful for implementing certain types of concurrent processing, so I implemented condition vars and mutexes to provide more appropriate tools.
