Java 定时任务调度(8)--ElasticJob 入门实战（ElasticJob-Lite使用）

ElasticJob 是一个分布式调度解决方案，由 2 个相互独立的子项目 ElasticJob-Lite 和 ElasticJob-Cloud 组成。本文主要介绍 ElasticJob-Lite 的基本使用，文中所使用到的软件版本：Spring Boot 2.4.4、jdk1.8.0_181、elasticjob-lite 3.0.0-RC1。

1、ElasticJob-Lite 简介

ElasticJob-Lite 定位为轻量级无中心化解决方案，使用jar的形式提供分布式任务的协调服务。架构图如下：

详细的介绍请参考官网文档：https://shardingsphere.apache.org/elasticjob/current/cn/overview/

2、使用

2.1、Zookeeper 环境准备

ElasticJob-Lite 使用 Zookeeper作为注册中心，需先安装 Zookeeper；安装方法可参考：https://www.cnblogs.com/wuyongyin/p/12485181.html

2.2、单独使用

2.2.1、引入依赖

<dependency><groupId>org.apache.shardingsphere.elasticjob</groupId><artifactId>elasticjob-lite-core</artifactId><version>3.0.0-RC1</version>
</dependency>

2.2.2、样例

开发 Job:

package com.abc.demo.solo;import org.apache.shardingsphere.elasticjob.api.ShardingContext;
import org.apache.shardingsphere.elasticjob.simple.job.SimpleJob;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;public class MyJob implements SimpleJob {private static Logger logger = LoggerFactory.getLogger(MyJob.class);@Overridepublic void execute(ShardingContext shardingContext) {logger.info(shardingContext.getJobName() + "|" + shardingContext.getShardingItem() + "|" + shardingContext.getShardingParameter());try {Thread.sleep(1000 * 5);} catch (InterruptedException e) {e.printStackTrace();}}
}

运行 Job:

package com.abc.demo.solo;import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;
import org.apache.shardingsphere.elasticjob.api.JobConfiguration;
import org.apache.shardingsphere.elasticjob.lite.api.bootstrap.impl.ScheduleJobBootstrap;
import org.apache.shardingsphere.elasticjob.reg.base.CoordinatorRegistryCenter;
import org.apache.shardingsphere.elasticjob.reg.zookeeper.ZookeeperConfiguration;
import org.apache.shardingsphere.elasticjob.reg.zookeeper.ZookeeperRegistryCenter;
import org.apache.shardingsphere.elasticjob.tracing.api.TracingConfiguration;import javax.sql.DataSource;public class MyJobDemo {public static void main(String[] args) {CoordinatorRegistryCenter coordinatorRegistryCenter = createRegistryCenter();DataSource dataSource = getDataSource();TracingConfiguration tracingConfig = new TracingConfiguration<>("RDB", dataSource);new ScheduleJobBootstrap(coordinatorRegistryCenter, new MyJob(), createJobConfiguration("job1", tracingConfig)).schedule();new ScheduleJobBootstrap(coordinatorRegistryCenter, new MyJob(), createJobConfiguration("job2", tracingConfig)).schedule();new ScheduleJobBootstrap(coordinatorRegistryCenter, new MyJob(), createJobConfiguration("job3", tracingConfig)).schedule();}private static CoordinatorRegistryCenter createRegistryCenter() {ZookeeperConfiguration zookeeperConfiguration = new ZookeeperConfiguration("10.40.100.69:2181", "my-job");zookeeperConfiguration.setMaxSleepTimeMilliseconds(1000 * 30);zookeeperConfiguration.setConnectionTimeoutMilliseconds(1000 * 30);CoordinatorRegistryCenter coordinatorRegistryCenter = new ZookeeperRegistryCenter(zookeeperConfiguration);coordinatorRegistryCenter.init();return coordinatorRegistryCenter;}private static JobConfiguration createJobConfiguration(String jobName, TracingConfiguration tracingConfig) {JobConfiguration jobConfiguration = JobConfiguration.newBuilder(jobName, 2).shardingItemParameters("0=Beijing,1=Shanghai").cron("0/20 * * * * ?").build();//配置事件追踪，即记录任务执行日志jobConfiguration.getExtraConfigurations().add(tracingConfig);return jobConfiguration;}//这里使用 Hikari 连接池，使用 Druid 有时会报错private static DataSource getDataSource() {HikariConfig hikariConfig = new HikariConfig();hikariConfig.setDriverClassName("com.mysql.cj.jdbc.Driver");hikariConfig.setJdbcUrl("jdbc:mysql://10.198.0.10:3306/itest?useUnicode=true&characterEncoding=UTF-8");hikariConfig.setUsername("root");hikariConfig.setPassword("Root_123!");hikariConfig.setMinimumIdle(2);hikariConfig.setMaximumPoolSize(5);hikariConfig.setConnectionTestQuery("select 1");HikariDataSource hikariDataSource = new HikariDataSource(hikariConfig);return hikariDataSource;}
}

2.3、Spring Boot 中整合 ElasticJob-Lite

2.3.1、引入依赖

<dependency><groupId>org.apache.shardingsphere.elasticjob</groupId><artifactId>elasticjob-lite-spring-boot-starter</artifactId><version>3.0.0-RC1</version>
</dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId>
</dependency>

2.3.2、application.yml

spring:datasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://10.198.0.10:3306/itest?useUnicode=true&characterEncoding=UTF-8username: rootpassword: 123456elasticjob:reg-center:server-lists: 10.40.100.69:2181namespace: my-jobmax-sleep-time-milliseconds: 30000connection-timeout-milliseconds: 30000jobs:FirstJob:elasticJobClass: com.abc.demo.job.FirstJobcron: 0/10 * * * * ?shardingTotalCount: 2shardingItemParameters: 0=Beijing,1=ShanghaiScriptJob:elasticJobType: SCRIPTcron: 0/20 * * * * ?shardingTotalCount: 2props:script.command.line: "/home/demo/test.sh"tracing:type: RDB

2.3.3、开发任务

com.abc.demo.job.FirstJob：

package com.abc.demo.job;import org.apache.shardingsphere.elasticjob.api.ShardingContext;
import org.apache.shardingsphere.elasticjob.simple.job.SimpleJob;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;@Component
public class FirstJob implements SimpleJob {private static Logger logger = LoggerFactory.getLogger(FirstJob.class);@Overridepublic void execute(ShardingContext shardingContext) {logger.info(shardingContext.getJobName() + "|" + shardingContext.getShardingItem() + "|" + shardingContext.getShardingParameter());try {Thread.sleep(1000 * 3);} catch (InterruptedException e) {e.printStackTrace();}}
}

脚本任务（/home/demo/test.sh）：

echo 'hello'
echo 'hello2'
echo 'hello3'

2.3.4、启动应用

应用启动后，任务开始运行。

2.4、部署控制台

下载 ElasticJob-Lite-UI 二进制包并解压：https://shardingsphere.apache.org/elasticjob/current/cn/downloads/

在 lib 目录下增加 MySQL、Druid 的驱动包，然后执行 bin/start.sh。

访问地址为：http://10.40.100.69:8088/ (root/root)

来源：Java 定时任务调度(8)--ElasticJob 入门实战（ElasticJob-Lite使用） - 咏吟 - 博客园