[英]Running each Spring Scheduler in its own thread
I have multiple components with @Scheduled
annotations, and I see that Spring only starts one at a time, even if they are scheduled to run on the same time. 我有多个带有
@Scheduled
注释的组件,我发现Spring一次只启动一个,即使它们被安排在同一时间运行。
My use case is as follows. 我的用例如下。 I want each @Scheduled annotation to run in its own thread, but only once for each thread.
我希望每个@Scheduled注释都在自己的线程中运行,但每个线程只运行一次。
Given this pseudo code with two schedulers: 给定这个带有两个调度程序的伪代码 :
@Scheduled(cron = "0 * * * * *") //run every minute
public void methodA() {
log.info("Running method A");
executeLongRunningJob("Finished method A");
}
@Scheduled(cron = "0 * * * * *") //run every minute
public void methodB() {
log.info("Running method B");
executeLongRunningJob("Finished method B");
}
private void executeLongRunningJob(String msg) {
Thread.sleep(70 seconds);
System.out.println(msg);
}
Note that the task takes longer time than the scheduler is scheduled to run. 请注意,该任务所需的时间比计划的调度程序运行时间长。 This is crucial.
这很关键。 I don't want the scheduler to start again before its finished running.
我不希望调度程序在完成运行之前重新启动。
Running this code out of the box gives me this output: 从开箱即用运行此代码为我提供了以下输出:
Running method A
Finished method A
Running method B
Finished method B
Running method A
Finished method A
Running method B
Finished method B
... and so on
So obviously its running both schedulers in a single thread. 显然它在一个线程中运行两个调度程序。
When I put @Async
on my expensive method, then I almost get the correct behavior, except the expensive method is not finished before a new scheduler is started. 当我把
@Async
放在我昂贵的方法上时,我几乎得到了正确的行为,除了在新的调度程序启动之前没有完成昂贵的方法。
Running method A
Running method B
Running method A
Running method B
Finished method A
Finished method B
... and so on
What I would like is this output: 我想要的是这个输出:
Running method A
Running method B
Finished method A
Finished method B
Running method A
Running method B
Finished method A
Finished method B
... and so on
How can I accomplish this? 我怎么能做到这一点? I want each Scheduler to run concurrently, but wait until it is finished before allowed to run again.
我希望每个调度程序同时运行,但等到它完成后再允许再次运行。 Remember I have more than two Schedulers running in same and sometimes different times.
请记住,我有两个以上的调度程序在相同且有时不同的时间运行。
You're right - by default scheduler uses a thread pool with size 1, so every task is being processed sequentially. 你没错 - 默认情况下,调度程序使用大小为1的线程池,因此每个任务都按顺序处理。 You can it by configuring
TaskScheduler
bean with desired pool size. 您可以通过配置具有所需池大小的
TaskScheduler
bean来实现。 Consider following example: 考虑以下示例:
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import java.util.Date;
@SpringBootApplication
@EnableScheduling
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
@Bean
public TaskScheduler taskScheduler() {
final ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
scheduler.setPoolSize(10);
return scheduler;
}
@Scheduled(fixedDelay = 2 * 1000L, initialDelay = 3 * 1000L)
public void scheduled1() throws InterruptedException {
System.out.println(new Date() + " " + Thread.currentThread().getName() + ": scheduled1");
Thread.sleep(1000);
}
@Scheduled(fixedDelay = 3 * 1000L, initialDelay = 3 * 1000L)
public void scheduled2() throws InterruptedException {
System.out.println(new Date() + " " + Thread.currentThread().getName() + ": scheduled2");
Thread.sleep(1000);
}
}
It will run every scheduled task in a separate thread, for example: 它将在单独的线程中运行每个计划任务,例如:
Tue Jul 18 20:21:50 CEST 2017 taskScheduler-1: scheduled2
Tue Jul 18 20:21:50 CEST 2017 taskScheduler-2: scheduled1
Tue Jul 18 20:21:53 CEST 2017 taskScheduler-1: scheduled1
Tue Jul 18 20:21:54 CEST 2017 taskScheduler-3: scheduled2
Tue Jul 18 20:21:56 CEST 2017 taskScheduler-2: scheduled1
Tue Jul 18 20:21:58 CEST 2017 taskScheduler-4: scheduled2
Tue Jul 18 20:21:59 CEST 2017 taskScheduler-1: scheduled1
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.