ElasticJob 是一個分布式調度解決方案，由 2 個相互獨立的子項目 ElasticJob-Lite 和 ElasticJob-Cloud 組成。本文主要介紹?ElasticJob-Lite 的基本使用，文中所使用到的軟件版本：Spring Boot?2.4.4、jdk1.8.0_181、elasticjob-lite 3.0.0-RC1。

1、ElasticJob-Lite 簡介

ElasticJob-Lite 定位為輕量級無中心化解決方案，使用jar的形式提供分布式任務的協調服務。架構圖如下：

?詳細的介紹請參考官網文檔：https://shardingsphere.apache.org/elasticjob/current/cn/overview/

2、使用

2.1、Zookeeper 環境準備

ElasticJob-Lite 使用 Zookeeper作為注冊中心，需先安裝 Zookeeper；安裝方法可參考：https://www.cnblogs.com/wuyongyin/p/12485181.html

2.2、單獨使用

2.2.1、引入依賴

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

2.2.2、樣例

開發 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();}} }

運行 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();//配置事件追蹤，即記錄任務執行日志jobConfiguration.getExtraConfigurations().add(tracingConfig);return jobConfiguration;}//這里使用 Hikari 連接池，使用 Druid 有時會報錯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、引入依賴

<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、開發任務

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();}} }

腳本任務（/home/demo/test.sh）：

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

2.3.4、啟動應用

應用啟動后，任務開始運行。

2.4、部署控制臺

下載 ElasticJob-Lite-UI 二進制包并解壓：https://shardingsphere.apache.org/elasticjob/current/cn/downloads/

在 lib 目錄下增加 MySQL、Druid 的驅動包，然后執行 bin/start.sh。

訪問地址為：http://10.40.100.69:8088/ (root/root)

來源：Java 定時任務調度(8)--ElasticJob 入門實戰（ElasticJob-Lite使用） - 詠吟 - 博客園?

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