This depends on the Async code.

This is an EventTupleSpace and EventSubspace implementation that still needs
cleanup work for removing event registrations.   This depends on the Async
protocol from the previous post.

After creating an instance of EventTupleSpace, you can register for
callbacks with the protocol #when:match:send:to:.  The eventSelector is one
of (#read, #write, #take, #scan) and the match argument is a tupleTemplate
to match with.  When you send

    ets when: #write match: ('Hello' | String) send: #beep to: Smalltalk.

then you later send

    ets add: ('Hello' | 'CampSmalltalk').

then you ought to beep.  the beep will occur on the receiver's Task  (in
this case the foreground global task.

enjoy!

- Rob
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