Mastering Concurrency Programming with Java 8

Additional information about executors

In this chapter, we have extended ThreadPoolExecutor and the ScheduledThreadPoolExecutor class and overridden some of their methods. But you can override more methods if you want a more particular behavior. These are some methods you can override:

• shutdown(): You must explicitly call this method to end the execution of the executor. You can override it to add some code to free additional resources used by your own executor.
• shutdownNow(): The difference between shutdown() and shutdownNow() is that the shutdown() method waits for the finalization of all the tasks that are waiting in the executor.
• submit(), invokeall(), or invokeany(): you call these methods to send concurrent tasks to the executor. You can override ...