github: https://github.com/jiasion/eslog
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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;@Configurationpublic 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@Slf4jpublic 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@Slf4jpublic 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，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对我们网站的支持！如果你觉得本文对你有帮助，欢迎转载，烦请注明出处，谢谢！
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