为什么没有Java Executors类提供的计划的缓存线程池？ [英] Why is there no scheduled cached thread pool provided by the Java Executors class?

问题描述

执行者提供 newCachedThreadPool（）和 newScheduledThreadPool（），但不是 newCachedScheduledThreadPool（），这里有什么？我有一个应用程序接收突发消息，并需要在每个固定延迟后安排相当长的处理步骤。时间约束不是超紧，但我宁愿在运行时创建更多的线程，如果我超过池大小，然后在不活动期间修剪它们。在并发库中有没有我错过的，或者我需要自己编写？

Executors provides newCachedThreadPool() and newScheduledThreadPool(), but not newCachedScheduledThreadPool(), what gives here? I have an application that receives bursty messages and needs to schedule a fairly lengthy processing step after a fixed delay for each. The time constraints aren't super tight, but I would prefer to have more threads created on the fly if I exceed the pool size and then have them trimmed back during periods of inactivity. Is there something I've missed in the concurrent library, or do I need to write my own?

推荐答案

通过设计ScheduledThreadPoolExecutor是固定大小。您可以使用提交到正常ExecutorService的单个线程版本来执行任务。这个事件线程+工作者池是相当容易协调和灵活性弥补专用线程。我以前用这个替换TimerTasks和其他非关键任务，以使用一个共同的执行器作为一个系统范围的池。

By design the ScheduledThreadPoolExecutor is a fixed size. You can use a single threaded version that submits to a normal ExecutorService for performing the task. This event thread + worker pool is fairly ease to coordinate and the flexibility makes up for the dedicated thread. I've used this in the past to replace TimerTasks and other non-critical tasks to utilize a common executor as a system-wide pool.

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