springboot实现多实例crontab抢占定时任务(实例代码)

github:

wechat:minghui-666

利用redisson实现多实例抢占定时任务

pom.xml

<dependency>
   <groupid>org.redisson</groupid>
   <artifactid>redisson</artifactid>
   <version>3.12.0</version>
</dependency>

kernel.java - 重写多线程调度

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) {
  //设定一个长度10的定时任务线程池
  taskregistrar.setscheduler(executors.newscheduledthreadpool(4));
 }
}

redissonmanager.java  -  分布式锁的实现

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定时脚本挂靠实例
 * 多实例会有重复调用问题 + 使用redisson实现分布式锁
 * 业务逻辑必须加锁 + 且需要保证 trylock 等待时间小于cron的最小间隔执行时间
 * */
 @scheduled(cron = "*/10 * * * * *")
 public void handlekernel() {
  redisson = redissonmanager.getredisson();
  if (redisson != null) {
   rlock lock = redisson.getlock(this.getclass().getname() + lokflag);
   boolean stat = false;
   try {
    // 尝试加锁，立即返回，最多等待5s自动解锁
    stat = lock.trylock(0, 5, timeunit.seconds);
    if (stat) {
     log.info("{} 取锁成功！{}",this.getclass().getname(), thread.currentthread().getname());
     redisutil.checkcount("log:limit_", dateformatv1.getdate("hh", "gmt+8"), 60*10, 1000);
    } else {
     log.info("{}没有获取到锁:{}", this.getclass().getname(), thread.currentthread().getname());
    }
   } catch (interruptedexception e) {
    log.error("redisson 获取分布式锁异常", e);
    if (!stat){
     return;
    }
    lock.unlock();
   }
  }
 }
}

kibana - 6个实例

总结

以上所述是小编给大家介绍的springboot实现多实例crontab抢占定时任务，希望对大家有所帮助