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Chapter 8. Applying Thread Pools > Extending ThreadPoolExecutor
8.4. Extending ThreadPoolExecutor
ThreadPoolExecutor was designed for extension, providing several “hooks” for subclasses to override—beforeExecute, afterExecute, and terminated—that can be used to extend the behavior of ThreadPoolExecutor.
The beforeExecute and afterExecute hooks are called in the thread that executes the task, and can be used for adding logging, timing, monitoring, or statistics gathering. The afterExecute hook is called whether the task completes by returning normally from run or by throwing an Exception. (If the task completes with an Error, afterExecute is not called.) If beforeExecute throws a RuntimeException, the task is not executed and afterExecute is not called.
