Github user liyinan926 commented on the pull request: https://github.com/apache/helix/pull/35#issuecomment-139021356 @kishoreg Yes, I was actually looking at `StateTransitionHandlerFactory` and I thought about doing that. The problem is `shutdown` is specific to `TaskStateModel` but not to the general `TransitionHandler`. So in order to do that in `StateTransitionHandlerFactory` I need to cast `TransitionHandler` to `TaskStateModel` whenever appropriate, which is hard to do.
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