线程池-isShutdown和isTerminated

以你之姓@ 2022-07-16 10:57 461阅读 0赞

## 1.线程池 isShutdown和isTerminated的区别 ##

isShutDown当调用shutdown()方法后返回为true。  
isTerminated当调用shutdown()方法后，并且所有提交的任务完成后返回为true

线程池任务正常完成，都为false

package com.cweeyii.threadpool;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import java.util.concurrent.ExecutorService;
    import java.util.concurrent.Executors;
    import java.util.concurrent.TimeUnit;
    
    /** * Created by wenyi on 16/10/16. * Email:caowenyi@meituan.com */
    public class ShutDownWait { 
        private static final Logger LOGGER = LoggerFactory.getLogger(ShutDownWait.class);
    
        public static void main(String[] args) throws InterruptedException {
            int workerNum = 2;
            ExecutorService executorService = Executors.newFixedThreadPool(workerNum);
            for (int i = 0; i < workerNum; i++) {
                executorService.submit(new SleepWorker());
            }
            //executorService.shutdown();
            //LOGGER.info("shutdown=" + executorService.isShutdown() + " terminate=" + executorService.isTerminated());
            executorService.awaitTermination(10, TimeUnit.SECONDS);
            LOGGER.info("shutdown="+executorService.isShutdown()+" terminate="+executorService.isTerminated());
            LOGGER.info("调用shutdown会立即返回不会等待线程池任务执行完");
        }
    }

12:56:58.849  INFO (SleepWorker.java:31) - threadName=pool-1-thread-1 线程结束null工作
    12:56:58.849  INFO (SleepWorker.java:31) - threadName=pool-1-thread-2 线程结束null工作
    12:57:06.843  INFO (ShutDownWait.java:26) - shutdown=false terminate=false
    12:57:06.846  INFO (ShutDownWait.java:27) - 调用shutdown会立即返回不会等待线程池任务执行完

取消注释后结果：
    13:57:08.518  INFO (ShutDownWait.java:24) - shutdown=true terminate=false
    13:57:10.523  INFO (SleepWorker.java:31) - threadName=pool-1-thread-1 线程结束null工作
    13:57:10.523  INFO (SleepWorker.java:31) - threadName=pool-1-thread-2 线程结束null工作
    13:57:10.526  INFO (ShutDownWait.java:26) - shutdown=true terminate=true
    13:57:10.527  INFO (ShutDownWait.java:27) - 调用shutdown会立即返回不会等待线程池任务执行完