2018-11-23

Quartz

Quartz:主要由以下几个组成Scheduler，job，JobDetail，Trigger，JobBuilder，TriggerBuilder。job：定义你想要被scheduler处理的逻辑，jobDetail，用于初始化job实例。trigger用于处理给定的job什么是很好开始执行。jobBuilder用于定义或者构建JobDetail实例，TriggerBuilder用于定义或者构建一个Trigger实例

// define the job and tie it to our HelloJob class  
JobDetail job = newJob(HelloJob.class)
      .withIdentity("myJob", "group1") // name "myJob", group "group1"
      .build();
// Trigger the job to run now, and then every 40 seconds
  Trigger trigger = newTrigger()
      .withIdentity("myTrigger", "group1")
      .startNow()
      .withSchedule(simpleSchedule()
          .withIntervalInSeconds(40)
          .repeatForever())            
      .build();

  // Tell quartz to schedule the job using our trigger
  sched.scheduleJob(job, trigger);

job 初始化

 import java.util.Date;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
public class HelloJob implements Job {

    public HelloJob() {
    }

    public void execute(JobExecutionContext context)
      throws JobExecutionException
    {
      System.err.println("Hello!  HelloJob is executing.");
    }
  }

当把job加载到scheduler时，jobDetail会被创建，jobDetail中存储一些job的状态信息

• jobDataMap 用来存储一些数据对象，当job实例化执行时获取这些对象值

JobDetail job = newJob(DumbJob.class)
      .withIdentity("myJob", "group1") // name "myJob", group "group1"
      .usingJobData("jobSays", "Hello World!")
      .usingJobData("myFloatValue", 3.141f)
      .build();
public class DumbJob implements Job {

    public DumbJob() {
    }

    public void execute(JobExecutionContext context)
      throws JobExecutionException
    {
      JobKey key = context.getJobDetail().getKey();

      JobDataMap dataMap = context.getJobDetail().getJobDataMap();

      String jobSays = dataMap.getString("jobSays");
      float myFloatValue = dataMap.getFloat("myFloatValue");

      System.err.println("Instance " + key + " of DumbJob says: " + jobSays + ", and val is: " + myFloatValue);
    }
  }

http://www.quartz-scheduler.org/documentation/quartz-2.2.x/tutorials/tutorial-lesson-09.html