Spring ScheduledTask - 启动/停止支持?

问题描述

有没有办法启动或停止使用使用上下文文件或 @Scheduled 注释初始化的 Spring 计划任务计划的任务?

Is there a way to start or stop a task scheduled using Spring Scheduled Tasks initialized using context file or @Scheduled annotation?

我想在需要时启动任务并在不再需要运行任务时停止它.

I would like to start the task when required and stop it when the task is no longer needed to be run.

如果这是不可能的，有什么替代方法可以将弹簧变量注入线程?

If this is not possible, any alternative to injecting spring variables to a thread?

推荐答案

以下是在 Spring Boot 中启动/停止计划方法的示例.您可以使用此类 API:
http:localhost:8080/start - 以固定速率 5000 毫秒启动预定方法
http:localhost:8080/stop - 用于停止预定方法

Here is an example of starting/stopping a scheduled method in Spring Boot. You can use such APIs:
http:localhost:8080/start - for starting scheduled method with fixed rate 5000 ms
http:localhost:8080/stop - for stopping scheduled method

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import java.time.Instant;
import java.util.concurrent.ScheduledFuture;

@Configuration
@ComponentScan
@EnableAutoConfiguration    
public class TaskSchedulingApplication {

    public static void main(String[] args) {
        SpringApplication.run(TaskSchedulingApplication.class, args);
    }

    @Bean
    TaskScheduler threadPoolTaskScheduler() {
        return new ThreadPoolTaskScheduler();
    }
}

@Controller
class ScheduleController {

    public static final long FIXED_RATE = 5000;

    @Autowired
    TaskScheduler taskScheduler;

    ScheduledFuture<?> scheduledFuture;

    @RequestMapping("start")
    ResponseEntity<Void> start() {
        scheduledFuture = taskScheduler.scheduleAtFixedRate(printHour(), FIXED_RATE);

        return new ResponseEntity<Void>(HttpStatus.OK);
    }

    @RequestMapping("stop")
    ResponseEntity<Void> stop() {
        scheduledFuture.cancel(false);
        return new ResponseEntity<Void>(HttpStatus.OK);
    }

    private Runnable printHour() {
        return () -> System.out.println("Hello " + Instant.now().toEpochMilli());
    }

}

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