ThreadPoolTaskScheduler可以註冊定時任務,ScheduledFuture有一個cancel方法可以取消定時任務,所以可以通過二者結合使用去完成定時任務的添加修改或者刪除
package com.holidaylee.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.scheduling.Trigger;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.stereotype.Component;
import javax.annotation.PostConstruct;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ScheduledFuture;
@Component
public class ScheduleTaskUtils {
private static Logger logger = LoggerFactory.getLogger(ScheduleTaskUtils.class);
private Map<String, ScheduledFuture<?>> futuresMap;
@Autowired
private ThreadPoolTaskScheduler threadPoolTaskScheduler;
/**
* 初始化任務列表
*/
@PostConstruct
public void init() {
futuresMap = new ConcurrentHashMap<>();
}
/**
* 創建ThreadPoolTaskScheduler線程池
*/
@Bean
public ThreadPoolTaskScheduler threadPoolTaskScheduler() {
ThreadPoolTaskScheduler threadPoolTaskScheduler = new ThreadPoolTaskScheduler();
threadPoolTaskScheduler.setPoolSize(8);
return threadPoolTaskScheduler;
}
/**
* 添加定時任務,如果任務名重複則拋出異常
* @param task 任務
* @param trigger 定時器
* @param key 任務名
* @return
*/
public boolean addTask(Runnable task, Trigger trigger, String key) {
ScheduledFuture<?> future = threadPoolTaskScheduler.schedule(task, trigger);
ScheduledFuture oldScheduledFuture = futuresMap.put(key, future);
if (oldScheduledFuture == null) {
return true;
} else {
throw new RuntimeException("添加任務key名: " + key + "重複" );
}
}
/**
* 移除定時任務
* @param key 任務名
* @return
*/
public boolean removeTask(String key) {
ScheduledFuture toBeRemovedFuture = futuresMap.remove(key);
if (toBeRemovedFuture != null) {
toBeRemovedFuture.cancel(true);
return true;
} else {
return false;
}
}
/**
* 更新定時任務
* 有可能會出現:1、舊的任務不存在,此時直接添加新任務;
* 2、舊的任務存在,先刪除舊的任務,再添加新的任務
* @param task 任務
* @param trigger 定時器
* @param key 任務名稱
* @return
*/
public boolean updateTask(Runnable task, Trigger trigger, String key) {
ScheduledFuture toBeRemovedFuture = futuresMap.remove(key);
// 存在則刪除舊的任務
if (toBeRemovedFuture != null) {
toBeRemovedFuture.cancel(true);
}
return addTask(task,trigger, key);
}
}
註明:
本文爲學習記錄筆記,不喜勿噴。