github:https://github.com/jiasion/eslog
wechat:minghui-666
利用redisson實現多實例搶佔定時任務
pom.xml
<dependency>
<groupId>org.redisson</groupId>
<artifactId>redisson</artifactId>
<version>3.12.0</version>
</dependency>
Kernel.java - 重寫多線程調度
package com.brand.log.scheduler;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import java.util.concurrent.Executors;
@Configuration
public class Kernel implements SchedulingConfigurer {
@Override
public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
//設定一個長度10的定時任務線程池
taskRegistrar.setScheduler(Executors.newScheduledThreadPool(4));
}
}
RedissonManager.java - 分佈式鎖的實現
package com.brand.log.util;
import lombok.extern.slf4j.Slf4j;
import org.redisson.Redisson;
import org.redisson.config.Config;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import javax.annotation.PostConstruct;
@Component
@Slf4j
public class RedissonManager {
@Value("${spring.redis.host}")
private String host;
@Value("${spring.redis.port}")
private int port;
private Redisson redisson = null;
private Config config = new Config();
@PostConstruct
private void init() {
try {
config.useSingleServer().setAddress("redis://" + host + ":" + port);
log.info("redisson address {} {}", host, port);
redisson = (Redisson) Redisson.create(config);
log.info("Redisson 初始化完成");
}
catch (Exception e) {
log.error("init Redisson error ", e);
}
}
public Redisson getRedisson() {
return redisson;
}
}
CronSynData.java
package com.brand.log.scheduler;
import com.brand.log.util.DateFormatV1;
import com.brand.log.util.RedisUtil;
import com.brand.log.util.RedissonManager;
import lombok.extern.slf4j.Slf4j;
import org.redisson.Redisson;
import org.redisson.api.RLock;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import java.util.concurrent.TimeUnit;
@Component
@Slf4j
public class CronSynData {
@Autowired
RedissonManager redissonManager;
@Autowired
RedisUtil redisUtil;
@Autowired
DateFormatV1 dateFormatV1;
private String lokFlag = ".handleKernel";
private Redisson redisson = null;
/*
* java定時腳本掛靠實例
* 多實例會有重複調用問題 + 使用Redisson實現分佈式鎖
* 業務邏輯必須加鎖 + 且需要保證 tryLock 等待時間小於cron的最小間隔執行時間
* */
@Scheduled(cron = "*/10 * * * * *")
public void handleKernel() {
redisson = redissonManager.getRedisson();
if (redisson != null) {
RLock lock = redisson.getLock(this.getClass().getName() + lokFlag);
Boolean stat = false;
try {
// 嘗試加鎖,立即返回,最多等待5s自動解鎖
stat = lock.tryLock(0, 5, TimeUnit.SECONDS);
if (stat) {
log.info("{} 取鎖成功!{}",this.getClass().getName(), Thread.currentThread().getName());
redisUtil.checkCount("log:limit_", dateFormatV1.getDate("HH", "GMT+8"), 60*10, 1000);
} else {
log.info("{}沒有獲取到鎖:{}", this.getClass().getName(), Thread.currentThread().getName());
}
} catch (InterruptedException e) {
log.error("Redisson 獲取分佈式鎖異常", e);
if (!stat){
return;
}
lock.unlock();
}
}
}
}
kibana - 6個實例