Elastic Job入门示例
Elastic Job官网:http://elasticjob.io/index_zh.html
示例：Spring Boot + Elastic Job 实现一个simple任务类型
1.maven 导入相关的包
com.dangdang
elastic-job-lite-core
2.1.5
org.apache.curator
curator-client
com.dangdang
elastic-job-lite-spring
2.1.5
org.apache.curator
curator-client
org.apache.curator
curator-client
2.11.1
2.相关的配置说明
RegistryCenterConfig：连接注册中心相关的配置
JobEventConfig： Event持久到DB的相关配置
SimpleJobConfig：实现SimpleJob接口的相关配置如下图：
3.配置代码
@Configuration
@ConditionalOnExpression("'${job.zookeeper.center.serverList}'.length() > 0")
public class RegistryCenterConfig {
/**
*
* @param serverList zookeeper 服务地址列表
* @param namespace 业务的命名空间,全局唯一
* @return
*/
@Bean(initMethod = "init")
public ZookeeperRegistryCenter regCenter(@Value("${job.zookeeper.center.serverList}") final String serverList,
@Value("${job.zookeeper.center.namespace}") final String namespace) {
return new ZookeeperRegistryCenter(new ZookeeperConfiguration(serverList, namespace));
}
}import com.dangdang.ddframe.job.event.JobEventConfiguration;
import com.dangdang.ddframe.job.event.rdb.JobEventRdbConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.annotation.Resource;
import javax.sql.DataSource;
@Configuration
public class JobEventConfig {
@Resource
private DataSource dataSource;
@Bean
public JobEventConfiguration jobEventConfiguration()
{
return new JobEventRdbConfiguration(dataSource);
}
}import com.dangdang.ddframe.job.api.ShardingContext;
import com.dangdang.ddframe.job.api.simple.SimpleJob;
import com.dangdang.ddframe.job.config.JobCoreConfiguration;
import com.dangdang.ddframe.job.config.simple.SimpleJobConfiguration;
import com.dangdang.ddframe.job.event.JobEventConfiguration;
import com.dangdang.ddframe.job.lite.config.LiteJobConfiguration;
import com.dangdang.ddframe.job.lite.spring.api.SpringJobScheduler;
import com.dangdang.ddframe.job.reg.zookeeper.ZookeeperRegistryCenter;
import javax.annotation.PostConstruct;
import javax.annotation.Resource;
/**
* Simple类型作业
* 需实现SimpleJob接口。该接口仅提供单一方法用于覆盖，此方法将定时执行。
* 与Quartz原生接口相似，但提供了弹性扩缩容和分片等功能
*
*/
public abstract class SimpleJobConfig implements SimpleJob {
@Resource
protected ZookeeperRegistryCenter regCenter;
@Resource
protected JobEventConfiguration jobEventConfiguration;
/**
* 作业启动时间的cron表达式
*
* @return
*/
abstract protected String getCron();
/**
* 作业分片总数
* 子类根据业务需要重写此方法
*
* @return
*/
protected int getShardingTotalCount()
{
return 1;//default 1
}
/**
* 设置分片序列号和个性化参数对照表.
* 子类根据需要重写此方法
*
*
* 分片序列号和参数用等号分隔, 多个键值对用逗号分隔. 类似map. 分片序列号从0开始, 不可大于或等于作业分片总数. 如: 0=a,1=b,2=c
*
*
* @return
*/
protected String getShardingItemParameters()
{
return "";
}
/**
* 获取执行任务实例的Class
* @return
* example:DemoTask.Class;
*/
abstract protected Class getJobClass();
/**
*
* @param jobClass
* @param cron
* @param shardingTotalCount
* @param shardingItemParameters
* @return
*/
protected LiteJobConfiguration getLiteJobConfiguration(final Class jobClass,
final String cron,
final int shardingTotalCount,
final String shardingItemParameters) {
return LiteJobConfiguration
.newBuilder(
new SimpleJobConfiguration(
JobCoreConfiguration.newBuilder(jobClass.getName(), cron, shardingTotalCount)
.shardingItemParameters(shardingItemParameters).build(),
jobClass.getCanonicalName()))
.overwrite(true).build();
}
@PostConstruct
public void simpleJobScheduler() {
new SpringJobScheduler(this,
regCenter,
getLiteJobConfiguration(this.getJobClass(), getCron(), getShardingTotalCount(), getShardingItemParameters()),
jobEventConfiguration)
.init();
}
}4. Task样例类
import com.alibaba.fastjson.JSON;
import com.dangdang.ddframe.job.api.ShardingContext;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
/**
* 简单任务的示例
*/
@Configuration("DemoTask")
public class DemoTask extends SimpleJobConfig {
@Value("${DemoTaskJob.cron}")
private String cronValue;
@Override
protected String getCron() {
return cronValue;
// return "0 0/1 * * * ?";
}
@Override
protected Class getJobClass() {
return DemoTask.class;
}
@Override
public void execute(ShardingContext shardingContext) {
String execTime=""+System.currentTimeMillis();
System.out.println("#####Begin DemoTask executed:"+execTime+"###########################################"+JSON.toJSONString(shardingContext));
try {
Thread.sleep(1000*60*3);
}catch (Exception ex){
ex.printStackTrace();
}
System.out.println("#####End DemoTask executed:"+execTime+", finished time:"+System.currentTimeMillis()+"###########################################"+JSON.toJSONString(shardingContext));
}
}#zk config
job.zookeeper.center.serverList=127.0.0.1:2181
job.zookeeper.center.namespace=job-test
#Demo task schedule time
DemoTaskJob.cron=0 0/1 * * * ?6.启动类
@EnableEurekaClient
@SpringBootApplication
@MapperScan("com.xxx.service.job.mapper")
@EnableScheduling
@PropertySource(value = {"classpath:business.properties"},encoding="utf-8")
public class Application extends SpringBootServletInitializer {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application)
{
return application.sources(Application.class);
}
}7.总结：
a.简单任务的实现，相关概念与参数的介绍后面在分析
b.查看zookeeper上的相关信息，可借ZooInspector工具