This is the first step towards a completely new and optimized actor
implementation for Akka Typed. The full previously existing test suite
passes for both implementations. The following is an incomplete list of
things that remain to be done:
* document the semantic differences between untyped and typed, in
particular around actor restarts and the delivery ordering guarantees
for Terminated messages (also document the difference between
ActorSystemImpl and ActorSystemAdapter)
* implement EventStream and logging—this currently just delegates to an
extra untyped ActorSystem (of course To Be Fixed)
* implement dispatcher selection
* implement and test queue size limitation
* implement optimized message queue instead of CLQ (for zero-allocation
messaging)
* clean up test log output (something does not work with TestEventListener
and EventFilter for ActorSystemImpl tests)
* document the capabilities (or more appropriately: the limitations) of
interoperability between ActorSystemImpl and ActorSystemAdapter
* fix ActorPath UID generation (i.e. make sure that everything gets a
meaningful value instead of zero)
* re-evaluate throughput/rescheduling logic in ActorCell
Oh, and by the way: as per PerformanceSpec (doing simple ping-pong) the
new implementation is ca. 30% faster than the adapter over akka-actor
:-)
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