CountDownLatch和CyclicBarrier用法实例大全
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在Java并发编程中,CountDownLatch和CyclicBarrier是两种非常重要的同步工具类,它们用于协调多个线程间的协作。这两个工具都是在`java.util.concurrent`包下,是Java并发库的重要组成部分。 **CountDownLatch** CountDownLatch是一个计数器,初始化时设定一个计数值,线程在执行任务之前会调用`countDown()`方法来减小计数值,直到计数值为0,所有等待的线程才会被释放并继续执行。这在多线程环境中常用来确保所有线程都完成特定的准备工作后,再一起开始执行后续的操作。 1. **初始化**: 通过`CountDownLatch(int count)`构造函数初始化,`count`表示倒计时的次数。 2. **countDown()**: 当一个线程完成其任务时,调用此方法,计数器减1。 3. **await()**: 其他线程调用`await()`会阻塞,直到计数器变为0才继续执行。 4. **一次性使用**: 一旦计数器归0,`await()`将不再阻塞任何线程,且CountDownLatch不能重置,只能一次性使用。 **CyclicBarrier** CyclicBarrier则更像一个障碍,它允许一组线程彼此等待,直到所有的线程都到达屏障点后,一起继续执行。与CountDownLatch不同,CyclicBarrier可以重置,因此可以多次使用。 1. **初始化**: 通过`CyclicBarrier(int parties, Runnable barrierAction)`构造函数初始化,`parties`表示需要等待的线程数量,`barrierAction`是所有线程都到达屏障时执行的任务。 2. **await()**: 当线程到达屏障点时,调用`await()`,直到所有线程都到达或被中断,或者超时,然后所有线程一起继续。 3. **重置**: 如果没有设置`barrierAction`,在所有线程都到达屏障后,屏障会被重置,计数器恢复到初始值,允许下一轮同步。 4. **屏障行动**: 可选地,当所有线程都到达屏障时,可以执行一个共享操作,如计算平均值、更新全局状态等。 在实际应用中,CountDownLatch常用于启动多线程后等待所有线程完成后再进行下一步,而CyclicBarrier则适用于多线程协同工作,每个阶段完成后所有线程再次聚合,比如赛车游戏的起点等待、分布式计算中的数据分区处理等场景。 在《java并发编程》中,可能包含以下实例: - 使用CountDownLatch实现多线程并行计算,最后汇总结果的例子。 - 使用CyclicBarrier实现多线程分治策略,每个子任务完成后来一次全局计算的例子。 - 线程间的异常处理,包括中断和超时的处理。 - 结合Future和ExecutorService,进一步提高并发性能和灵活性。 - 在大型项目中的实际应用案例,如数据库批量导入、分布式任务调度等。 学习和理解这两个工具,对于提升Java并发编程的能力至关重要,它们能帮助我们编写出更加高效、可维护的并发代码。通过阅读《java并发编程》中的实例,你可以更深入地掌握这些概念,并在实际工作中灵活运用。
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