Motivation:
While we use DefaultPromise as our implementation of Promise and Future users should not really use it directly. Users should always use the EventExecutor / EventLoop to create a Promise / Future.
Modifications:
- Change static Promise methods to be package-private
- Add default implementations for Promise and Future creation to EventExecutor
- Change public constructor to protected
- Remove usage of DefaultPromise in our tests
Result:
Less likely users will depend on the actual Promise implementation
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