elasticJob+SpringBoot 分布式定时任务

elasticJob
项目结构如下：

image.png

pom.xml依赖，因为elastic-job-lite-spring中有curator依赖，所以不用引curator jar包，

<dependency>
        <groupId>com.dangdang</groupId>
        <artifactId>elastic-job-lite-spring</artifactId>
        <version>2.1.5</version>
</dependency>

xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:reg="http://www.dangdang.com/schema/ddframe/reg" xmlns:job="http://www.dangdang.com/schema/ddframe/job"
       xmlns:jod="http://www.dangdang.com/schema/ddframe/job"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                        http://www.dangdang.com/schema/ddframe/reg http://www.dangdang.com/schema/ddframe/reg/reg.xsd
                        http://www.dangdang.com/schema/ddframe/job http://www.dangdang.com/schema/ddframe/job/job.xsd">
    <!--配置作业注册中心 -->
    <reg:zookeeper id="regCenter" server-lists="zookeeper注册中心地址" namespace="名字"
                   base-sleep-time-milliseconds="基本的sleepTime"
                   max-sleep-time-milliseconds="最大的sleepTime"
                   max-retries="最大尝试次数"/>


    <!-- 同步example-->
    <job:simple id="exampleJob"
                class="spring.boot.job.ExampleJob" registry-center-ref="regCenter"
                sharding-total-count="10" cron="0 0/1 * * * ? " description="example"
                overwrite="true"/>

</beans>

exampleJob代码如下：

package spring.boot.job;

import com.dangdang.ddframe.job.api.ShardingContext;
import com.dangdang.ddframe.job.api.simple.SimpleJob;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ExampleJob implements SimpleJob {

    private static final Logger LOGGER = LoggerFactory.getLogger(ExampleJob.class);

    @Override
    public void execute(ShardingContext shardingContext) {
        int item = shardingContext.getShardingItem();
        int itemTotal = shardingContext.getShardingTotalCount();
        LOGGER.info("===item:{},itemTotal:{}",item,itemTotal);
    }
}

启动类如下：

package spring.boot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ImportResource;

@SpringBootApplication
//@ImportResource("classpath:spring/dubbo.xml")
@ImportResource("classpath:spring/applicationContext-elasticjoblite.xml")
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}

启动项目测试，结果如下：

2019-10-29 16:24:01.699  INFO 6216 --- [ob-exampleJob-1] spring.boot.job.ExampleJob               : ===item:0,itemTotal:10
2019-10-29 16:24:01.699  INFO 6216 --- [ob-exampleJob-2] spring.boot.job.ExampleJob               : ===item:1,itemTotal:10
2019-10-29 16:24:01.699  INFO 6216 --- [ob-exampleJob-3] spring.boot.job.ExampleJob               : ===item:2,itemTotal:10
2019-10-29 16:24:01.699  INFO 6216 --- [ob-exampleJob-4] spring.boot.job.ExampleJob               : ===item:3,itemTotal:10
2019-10-29 16:24:01.699  INFO 6216 --- [ob-exampleJob-5] spring.boot.job.ExampleJob               : ===item:4,itemTotal:10
2019-10-29 16:24:01.699  INFO 6216 --- [ob-exampleJob-6] spring.boot.job.ExampleJob               : ===item:5,itemTotal:10
2019-10-29 16:24:01.699  INFO 6216 --- [ob-exampleJob-1] spring.boot.job.ExampleJob               : ===item:8,itemTotal:10
2019-10-29 16:24:01.699  INFO 6216 --- [ob-exampleJob-2] spring.boot.job.ExampleJob               : ===item:9,itemTotal:10
2019-10-29 16:24:01.699  INFO 6216 --- [ob-exampleJob-7] spring.boot.job.ExampleJob               : ===item:6,itemTotal:10
2019-10-29 16:24:01.699  INFO 6216 --- [ob-exampleJob-8] spring.boot.job.ExampleJob               : ===item:7,itemTotal:10

多台服务器同时执行定时任务，如下：
将任务分为10片（sharding-total-count="10"）
可以通过id/10来做分片管理；

 int item = shardingContext.getShardingItem();
 int itemTotal = shardingContext.getShardingTotalCount();
 if (item == Math.floorMod(Dto.getId(), itemTotal)) {
        //doSomething
}