Github user bbende commented on the pull request:
https://github.com/apache/nifi/pull/189#issuecomment-174615789
Pushed up a new commit that combines stop() and close() into a single call
for simplicity, basically preventing someone from calling close() without
calling stop().
Added additional checks on the stopped flag in the run method:
* Right after returning from select which should happen during close() when
selector.wakeup() is called and stopped is already true
* While looping over the selected keys in run() so that we don't modify the
keys after being stopped
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