Question

我想以这种方式安排我的工作： 1）只有一个线程运行它。（串行） 2）两次运行之间有固定间隔

我在我的方法上使用@Scheduled(fixedDelay = 10000)，在我的applicationContext.xml中使用<task:annotation-driven/>。但根据我的打印信息，我设置的两个作业之间的间隔不是10000毫秒。那是为什么？

19:07-25 22:38:46.190 INFO  schedule:33 [21-thread-1] - [job#1] is running.   ----->   1469457526190
20:07-25 22:38:48.191 INFO  schedule:45 [21-thread-1] - [job#1] use 2000ms
21:07-25 22:38:48.191 INFO  schedule:47 [21-thread-1] - [job#1] is finished.  ----->   1469457528191
25:07-25 22:39:03.198 INFO  schedule:33 [21-thread-1] - [job#1] is running.   ----->   1469457543198
26:07-25 22:39:05.201 INFO  schedule:45 [21-thread-1] - [job#1] use 2002ms
27:07-25 22:39:05.202 INFO  schedule:47 [21-thread-1] - [job#1] is finished.  ----->   1469457545202
31:07-25 22:39:20.205 INFO  schedule:33 [21-thread-1] - [job#1] is running.   ----->   1469457560205
32:07-25 22:39:22.209 INFO  schedule:45 [21-thread-1] - [job#1] use 2004ms
33:07-25 22:39:22.210 INFO  schedule:47 [21-thread-1] - [job#1] is finished.  ----->   1469457562210
37:07-25 22:39:37.213 INFO  schedule:33 [21-thread-1] - [job#1] is running.   ----->   1469457577213
38:07-25 22:39:39.215 INFO  schedule:45 [21-thread-1] - [job#1] use 2002ms
39:07-25 22:39:39.215 INFO  schedule:47 [21-thread-1] - [job#1] is finished.  ----->   1469457579215
43:07-25 22:39:54.221 INFO  schedule:33 [21-thread-1] - [job#1] is running.   ----->   1469457594221
44:07-25 22:39:56.225 INFO  schedule:45 [21-thread-1] - [job#1] use 2004ms
45:07-25 22:39:56.225 INFO  schedule:47 [21-thread-1] - [job#1] is finished.  ----->   1469457596225
49:07-25 22:40:11.525 INFO  schedule:33 [21-thread-1] - [job#1] is running.   ----->   1469457611525
50:07-25 22:40:13.528 INFO  schedule:45 [21-thread-1] - [job#1] use 2003ms
51:07-25 22:40:13.529 INFO  schedule:47 [21-thread-1] - [job#1] is finished.  ----->   1469457613529
55:07-25 22:40:28.237 INFO  schedule:33 [21-thread-1] - [job#1] is running.   ----->   1469457628237

你可以看到完成和运行之间的时间不是10000毫秒。（更像是15000）

代码是（春季4.2.1）：

   @Scheduled(fixedDelay = 10000)
    public void timerJob1(){
        SCHEDULER.info("[job#1] is running.   ----->   {}", System.currentTimeMillis());
        Stopwatch stopwatch = Stopwatch.createStarted();

        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            e.printStackTrace();
            long use = stopwatch.elapsed(TimeUnit.MILLISECONDS);
            SCHEDULER.info("[timeJob1] use {}ms", use);
        }

        long use = stopwatch.elapsed(TimeUnit.MILLISECONDS);
        SCHEDULER.info("[job#1] use {}ms", use);

        SCHEDULER.info("[job#1] is finished.  ----->   {}", System.currentTimeMillis());
    }

Answer 1

您可能会对正在使用的线程池产生争用。创建自己的执行程序，通过实现和连接ScheduledConfigurer来处理这些固定的延迟任务。

在configureTasks（）的实现中，将自己的Executor设置为方法参数ScheduledTaskRegistrar上的调度程序。

Spring @Scheduled fixedDelay不能按预期工作

1 个答案: