Question

我已经将此作为配置

 @Bean
    public ThreadPoolTaskScheduler taskScheduler() {
        ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler();
        taskScheduler.setPoolSize(3);
        taskScheduler.setThreadNamePrefix("worker-thread-");
        return taskScheduler;
    }

每100毫秒轮询一次的Poller.java

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
@Slf4j
public class Poller {

    private Processor processor

    @Autowired
    public SqsPoller(Processor processor) {
        this.processor = processor;
    }

    @Scheduled(fixedRate = 100)
    public void poll() throws InterruptedException {
        log.info("polling");
        processor.processMessages();
    }
}

Processor.java做一个耗时5秒钟左右的示例

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

@Slf4j
@Component
public class Processor {
    public void processMessages() throws InterruptedException {
        log.info("processing message and sleep 5 seconds");
        Thread.sleep(5000);
    }
}

当我运行它时，这就是输出

      2018-11-02 21:13:43.029  INFO 6642 --- [   worker-thread-1]: polling 
        2018-11-02 21:13:43.029  INFO 6642 --- [   worker-thread-1]: processing message and sleep 5 seconds
        2018-11-02 21:13:48.034  INFO 6642 --- [   worker-thread-2]: polling 
        2018-11-02 21:13:48.035  INFO 6642 --- [   worker-thread-2]: processing message and sleep 5 seconds
        2018-11-02 21:13:53.037  INFO 6642 --- [   worker-thread-2]: polling 
        2018-11-02 21:13:53.037  INFO 6642 --- [   worker-thread-2]: processing message and sleep 5 seconds
....
        2018-11-02 21:14:53.078  INFO 6642 --- [   worker-thread-1]: polling 
        2018-11-02 21:14:53.078  INFO 6642 --- [   worker-thread-1]: processing message and sleep 5 seconds
        2018-11-02 21:14:58.081  INFO 6642 --- [   worker-thread-1]: polling 
        2018-11-02 21:14:58.082  INFO 6642 --- [   worker-thread-1]: processing message and sleep 5 seconds
        2018-11-02 21:15:03.086  INFO 6642 --- [   worker-thread-1]: polling 
        2018-11-02 21:15:03.087  INFO 6642 --- [   worker-thread-1]: processing message and sleep 5 seconds
    ....
        2018-11-02 21:16:38.148  INFO 6642 --- [   worker-thread-1]: polling 
        2018-11-02 21:16:38.148  INFO 6642 --- [   worker-thread-1]: processing message and sleep 5 seconds
        2018-11-02 21:16:43.153  INFO 6642 --- [   worker-thread-2]: polling 
        2018-11-02 21:16:43.153  INFO 6642 --- [   worker-thread-2]: processing message and sleep 5 seconds
....
        2018-11-02 21:21:48.339  INFO 6642 --- [   worker-thread-3]: polling 
        2018-11-02 21:21:48.339  INFO 6642 --- [   worker-thread-3]: processing message and sleep 5 seconds
        2018-11-02 21:21:53.345  INFO 6642 --- [   worker-thread-3]: polling 
        2018-11-02 21:21:53.345  INFO 6642 --- [   worker-thread-3]: processing message and sleep 5 seconds

如您所见，没有多线程发生，似乎线程1正在轮询和处理，或者它本身开始再次轮询和处理，或者另一个线程，但是在任何给定时间，只有一个正在执行。

我会认为至少有3个线程正在并行执行，因为触发3个线程只需要300毫秒。每个过程都需要5秒钟才能完成，因此，直到至少一个线程完成为止，没有安排其他任何事情。

我是否以某种方式误解了/错误地配置了3个线程以并行方式运行？

谢谢

Answer 1

因此，要使其并行执行任务，我需要做两件事 1.在配置上@EnableAsync 2.使用以下@Async注释上面的processMessage

@Async
public void processMessages() {
  ...
}

@安排为ThreadPoolTaskScheduler行为

1 个答案:

@安排为ThreadPoolTask​​Scheduler行为

1 个答案:

@安排为ThreadPoolTaskScheduler行为