[actor shutdown] Context method + no-deliver state #71
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Summary
Adds an initial
shutdown
message to the actor context. This allows an actor to immediately shutdown (only callable from within the actor) and sets some state on the actor so that no new messages are received.Motivation
Part of #29.
This is only a small subset of actor shutdown logic, see #29 for full details.
Test Plan
Still TBD. I'll see how this evolves as shutdown evolves over the course of implementing #29.