SpringBoot实现动态多线程并发定时任务

2024-04-02 19:04:59 668人浏览安东尼

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摘要

本文实例为大家分享了SpringBoot实现动态多线程并发定时任务的具体代码，供大家参考，具体内容如下实现定时任务有多种方式，使用spring自带的，继承SchedulinGCon

本文实例为大家分享了SpringBoot实现动态多线程并发定时任务的具体代码，供大家参考，具体内容如下

实现定时任务有多种方式，使用spring自带的，继承SchedulinGConfigurer的方式。

一、实现

1、启动类

在启动类添加注解@EnableScheduling开启，不然不起用做。

2、新建任务类

添加注解@Component注册到spring的容器中。

package com.example.demo.task;

import com.example.demo.entity.MyTask;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.config.CronTask;
import org.springframework.scheduling.config.ScheduledTaskReGIStrar;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import javax.annotation.PreDestroy;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledFuture;


@Slf4j
@Component
public class ScheduledTask implements SchedulingConfigurer {

    private volatile ScheduledTaskRegistrar registrar;

    private final ConcurrentHashMap<String, ScheduledFuture<?>> scheduledFutures = new ConcurrentHashMap<>();

    private final ConcurrentHashMap<String, CronTask> cronTasks = new ConcurrentHashMap<>();

    
    private static final Integer DEFAULT_THREAD_POOL = 10;

    @Override
    public void configureTasks(ScheduledTaskRegistrar registrar) {
        registrar.setScheduler(Executors.newScheduledThreadPool(DEFAULT_THREAD_POOL));
        this.registrar = registrar;
    }

    @PreDestroy
    public void destroy() {
        this.registrar.destroy();
    }

    
    public void refreshTask(List<MyTask> tasks) {
        // 删除已经取消任务
        scheduledFutures.keySet().forEach(key -> {
            if (Objects.isNull(tasks) || tasks.size() == 0) {
                scheduledFutures.get(key).cancel(false);
                scheduledFutures.remove(key);
                cronTasks.remove(key);
                return;
            }
            tasks.forEach(task -> {
                if (!Objects.equals(key, task.getTaskId())) {
                    scheduledFutures.get(key).cancel(false);
                    scheduledFutures.remove(key);
                    cronTasks.remove(key);
                    return;
                }
            });
        });

        // 添加新任务、更改执行规则任务
        tasks.forEach(txTask -> {
            String expression = txTask.getExpression();
            // 任务表达式为空则跳过
            if (StringUtils.isEmpty(expression)) {
                return;
            }

            // 任务已存在并且表达式未发生变化则跳过
            if (scheduledFutures.containsKey(txTask.getTaskId()) && cronTasks.get(txTask.getTaskId()).getExpression().equals(expression)) {
                return;
            }

            // 任务执行时间发生了变化，则删除该任务
            if (scheduledFutures.containsKey(txTask.getTaskId())) {
                scheduledFutures.get(txTask.getTaskId()).cancel(false);
                scheduledFutures.remove(txTask.getTaskId());
                cronTasks.remove(txTask.getTaskId());
            }
            CronTask task = new CronTask(new Runnable() {
                @Override
                public void run() {
                    // 执行业务逻辑
                    try {
                        log.info("执行单个任务，任务ID【{}】执行规则【{}】", txTask.getTaskId(), txTask.getExpression());
                        System.out.println("==========================执行任务=============================");
                    } catch (Exception e) {
                        log.error("执行发送消息任务异常，异常信息：{}", e);
                    }
                }
            }, expression);
            ScheduledFuture<?> future = registrar.getScheduler().schedule(task.getRunnable(), task.getTrigger());
            cronTasks.put(txTask.getTaskId(), task);
            scheduledFutures.put(txTask.getTaskId(), future);
        });
    }

}

3、创建自启动任务类

package com.example.demo.task;

import com.example.demo.task.ScheduledTask;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Component;

import java.util.Arrays;
import java.util.List;


@Slf4j
@Component
public class MyApplicationRunner implements ApplicationRunner {

    @Autowired
    private ScheduledTask scheduledTask;

    @Override
    public void run(ApplicationArguments args) throws Exception {
        log.info("================项目启动初始化定时任务====开始===========");
        
        List<MyTask> tasks = Arrays.asList(
                MyTask.builder().taskId("10001").expression("*/10 * * * * ?").build(),
                MyTask.builder().taskId("10002").expression("*/15 * * * * ?").build(),
                MyTask.builder().taskId("10003").expression("*/20 * * * * ?").build()
        );
        scheduledTask.refreshTask(tasks);
        log.info("================项目启动初始化定时任务====完成==========");
    }
}

4、实体

package com.example.demo.entity;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;


@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class MyTask {

    
    private String taskId;

    
    private String expression;
}