ElasticJob单点使用
任务类
public class BackupJob implements SimpleJob { public void execute(ShardingContext shardingContext) { String selectSql = "select * from resume where state='未归档' limit 1"; List<Map<String, Object>> list = JdbcUtil.executeQuery(selectSql); if(list == null || list.size() == 0) { return; } Map<String, Object> stringObjectMap = list.get(0); long id = (long) stringObjectMap.get("id"); String name = (String) stringObjectMap.get("name"); String education = (String) stringObjectMap.get("education");// 打印出这条记录 System.out.println("======>>>id:" + id + " name:" + name + " education:" + education);// 更改状态 String updateSql = "update resume set state='已归档' where id=?"; JdbcUtil.executeUpdate(updateSql,id);// 归档这条记录 String insertSql = "insert into resume_bak select * from resume where id=?"; JdbcUtil.executeUpdate(insertSql,id); }}主要的任务就是将未归档的数据整理到归档的表中,表结构一样
执行类
public class JobMain { public static void main(String[] args) { //初始化注册中心 ZookeeperConfiguration zookeeperConfiguration = new ZookeeperConfiguration("127.0.0.1:2181","data-job"); CoordinatorRegistryCenter coordinatorRegistryCenter= new ZookeeperRegistryCenter(zookeeperConfiguration); coordinatorRegistryCenter.init(); //创建任务 JobCoreConfiguration jobCoreConfiguration = JobCoreConfiguration.newBuilder("data-job","*/2 * * * * ?",1).build(); SimpleJobConfiguration simpleJobConfiguration = new SimpleJobConfiguration(jobCoreConfiguration,BackupJob.class.getName()); //执行任务 new JobScheduler(coordinatorRegistryCenter, LiteJobConfiguration.newBuilder(simpleJobConfiguration).build()).init(); }}这种情况下,启动两个任务类只会有一个在执行任务。但是当一个任务停止之后,另一个任务会立马开始接着执行任务,相当于其他中间件中的主备切换。但是这里的主备切换是依托zk进行的
多节点分布式任务调度
修改执行类的代码为
public class JobMain { public static void main(String[] args) { //初始化注册中心 ZookeeperConfiguration zookeeperConfiguration = new ZookeeperConfiguration("127.0.0.1:2181","data-job"); CoordinatorRegistryCenter coordinatorRegistryCenter= new ZookeeperRegistryCenter(zookeeperConfiguration); coordinatorRegistryCenter.init(); //创建任务 JobCoreConfiguration jobCoreConfiguration = JobCoreConfiguration.newBuilder("data-job","*/2 * * * * ?",3).build(); SimpleJobConfiguration simpleJobConfiguration = new SimpleJobConfiguration(jobCoreConfiguration,BackupJob.class.getName()); //执行任务 new JobScheduler(coordinatorRegistryCenter, LiteJobConfiguration.newBuilder(simpleJobConfiguration).overwrite(true).build()).init(); }}除了修改分片数还需要在执行任务的类中执行相应的分片参数,另外需要注意的是仅仅增加分票策略是不生效的,必须同时配置分片参数。另外如果使用同一个job来做执行的话。需要增加overwrite为true
执行器代码为
```
public class BackupJob implements SimpleJob {
public void execute(ShardingContext shardingContext) {
int shardingitem = shardingContext.getShardingItem();
System.out.println("当前分片"+shardingitem);
String shardingParamter = shardingContext.getShardingParameter();
System.out.println(shardingParamter);
String selectSql = "select * from resume where state='未归档' and name='"+shardingParamter+"' limit 1";
List<Map<String, Object>> list =
JdbcUtil.executeQuery(selectSql);
if(list == null || list.size() == 0) {
return;
}
Map<String, Object> stringObjectMap = list.get(0);
long id = ......
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ElasticJob单点使用任务类publicclassBackupJobimplementsSimpleJob{publicvoidexecute(ShardingContextshardingContext){StringselectSql="select*fromresumewherestate='未归档'limit1";List<Map<St
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