Add support for static service lifecycle listeners .
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Key: MAPREDUCE-3995
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3995
Project: Hadoop Map/Reduce
Issue Type: Sub-task
Components: mrv2
Affects Versions: 0.23.1, 0.24.0
Reporter: Steve Loughran
Assignee: Steve Loughran
Priority: Minor
Add support to {{AbstractService}} that allow callers to register listeners for
all instances. The existing listener interface could be used. This allows
management tools to hook into the events.
The static listeners would be invoked for all state changes except creation
(base class shouldn't be handing out references to itself at this point).
These static events could all be async, pushed through a shared
{{ConcurrentLinkedQueue}}; failures logged at warn and the rest of the
listeners invoked.
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