- Created a real async handler for java allowing callbacks
into java code. Code to be registered must implement the
new AsyncCallback interface.
- Renamed classes/methods to Java-ish names.
- Fixes to support 'this' removal for AsyncOp.
- Java's cursor ops, like 'insert' set up the value unpackers
after insert completes. For AsyncOp, we take a different
approach, and invalidate the unpacker when the op completes,
letting the value be fetched when needed.
- Added new test AsyncTest that tests doing different numbers of
async ops with different parameters, and also with different types
of keys/values.
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