Motivation:
EventExecutor.parent() and EventLoop.parent() almost always return a constant parent executor. There's not much reason to let it implemented in subclasses.
Modifications:
- Implement AbstractEventExecutor.parent() with an additional contructor
- Add AbstractEventLoop so that subclasses extend AbstractEventLoop, which implements parent() appropriately
- Remove redundant parent() implementations in the subclasses
- Fix inspector warnings
Result:
Less duplication.
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