Github user olegz commented on the pull request:
https://github.com/apache/nifi/pull/354#issuecomment-211703487
@YolandaMDavis this looks very good. One general comment; Just to finish
the life-cycle loop I'd suggest adding a stop operation (operation annotated
with @OnStopped) where based on what I see you would simply set _transformer_
to null, unless there is some stop/cleanup procedure required (e.g., close
something etc.).
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