Cert Obj Use Executors and ThreadPools
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| [11.3.1]Use Executors and ThreadPools (OCP Objective 11.3) | Use Executor, ExecutorService, Executors, Callable, and Future to execute tasks
using thread pools.
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| [11.3.2]name of Executor factory class | Executors.newFixedThreadPool(100) returns Executor or ExecutorService
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| [11.3.3}how to handle tasks | execute,submit,invokeAny,invokeAll --> you can submit a task in the form of a Runnable,or Callable, or collection of Callable instances
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| [11.3.4]graceful finishing | shutdown or shutdownNow
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| [11.3.5]highly specialized type of Executor | Fork-Join framework [at a time only a single FJF should be run in an application]
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| [11.3.6]base classes to extend while creating multiple subtasks | RecursiveAction or RecursiveTask which extend abstract class ForkJoinTask
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| [11.3.7]method of RecursiveAction or RecursiveTask is compute() | new ForkJoinPoll().invoke(task)
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| [11.3.8] LinkedTransferQueue |
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