Executorservice 检查所有任务都完成了

Question

我想在提交新的一批任务之前检查是否所有的执行程序服务任务都完成了，这里是我的代码：

     ExecutorService executorService = Executors.newFixedThreadPool(concurrency);
     for(int i=0;i<batch;i++){      
  
        for(int j=0;j<concurrency;j++) {
            executorService.submit(new DOTASK(0,loopTimes));
        }
      
        while(executorService != done){
                    // wait
             }
            System.out.println("Batch "+i+"Complete")

        }
        executorService.shutdown();
        executorService.awaitTermination(1, TimeUnit.DAYS);

Answer 1

CountDownLatch是您的一个选择

ExecutorService executorService = Executors.newFixedThreadPool(concurrency);
for(int i=0;i<batch;i++){      

    CountLatchDown latch = new CountDownLatch(concurrency);
    for(int j=0;j<concurrency;j++) {
        executorService.submit(new DOTASK(0,loopTimes));
    }
    //in each DOTASK thread invoke latch.countDown()
    latch.await();
    System.out.println("Batch "+i+"Complete")

}
executorService.shutdown();
executorService.awaitTermination(1, TimeUnit.DAYS);