Quartz_2.2.X学习系列十七：Example 5 - Handling Job Misfires

Sometimes job will not execute when they are supposed to. See how to handle these Misfires

 

说明：

因为类使用禁止并发，所以Trigger设置的是3秒执行一次，但是由于每一个JOB都要等10秒，当下一个3秒，Quartz触发新的任务时会失败，因为上一个Job还没有执行完（还需要7秒后才能执行完）。

@PersistJobDataAfterExecution

@DisallowConcurrentExecution

 

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package org.quartz.examples.example5;

 

import org.quartz.DisallowConcurrentExecution;

import org.quartz.Job;

import org.quartz.JobDataMap;

import org.quartz.JobExecutionContext;

import org.quartz.JobExecutionException;

import org.quartz.PersistJobDataAfterExecution;

 

import java.util.Date;

 

/**

 * <p>

 * A dumb implementation of Job, for unit testing purposes.

 * </p>

 *

 * @author James House

 */

@PersistJobDataAfterExecution

@DisallowConcurrentExecution

public class StatefulDumbJob implements Job {

 

  /*

   * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Constants.

   * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

   */

 

  public static final String NUM_EXECUTIONS  = "NumExecutions";

 

  public static final String EXECUTION_DELAY = "ExecutionDelay";

 

  /*

   * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Constructors.

   * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

   */

 

  public StatefulDumbJob() {

  }

 

  /*

   * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interface.

   * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

   */