Quartz_2.2.X学习系列十六：Example 4 - Job State and Parameters

Demonstrates how parameters can be passed into jobs and how jobs maintain state

 

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package org.quartz.examples.example4;

 

import java.util.Date;

 

import org.quartz.DisallowConcurrentExecution;

import org.quartz.Job;

import org.quartz.JobDataMap;

import org.quartz.JobExecutionContext;

import org.quartz.JobExecutionException;

import org.quartz.JobKey;

import org.quartz.PersistJobDataAfterExecution;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

 

/**

 * <p>

 * This is just a simple job that receives parameters and

 * maintains state

 * </p>

 *

 * @author Bill Kratzer

 */

@PersistJobDataAfterExecution

@DisallowConcurrentExecution

public class ColorJob implements Job {

 

    private static Logger _log = LoggerFactory.getLogger(ColorJob.class);

   

    // parameter names specific to this job

    public static final String FAVORITE_COLOR = "favorite color";

    public static final String EXECUTION_COUNT = "count";

   

    // Since Quartz will re-instantiate a class every time it

    // gets executed, members non-static member variables can

    // not be used to maintain state!

    private int _counter = 1;

 

    /**

     * <p>

     * Empty constructor for job initialization

     * </p>

     * <p>

     * Quartz requires a public empty constructor so that the

     * scheduler can instantiate the class whenever it needs.

     * </p>

     */

    public ColorJob() {

    }

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