/*  * Copyright 2005 OpenSymphony  *  * Licensed under the Apache License, Version 2.0 (the "License"); you may not  * use this file except in compliance with the License. You may obtain a copy  * of the License at  *  *   http://www.apache.org/licenses/LICENSE-2.0  *    * Unless required by applicable law or agreed to in writing, software  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the  * License for the specific language governing permissions and limitations  * under the License. *  */package org.quartz.examples.example4;import java.util.Date;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.quartz.JobDataMap;import org.quartz.JobExecutionContext;import org.quartz.JobExecutionException;import org.quartz.StatefulJob;/** * <p> * This is just a simple job that receives parameters and * maintains state * </p> *  * @author Bill Kratzer */public class ColorJob implements StatefulJob {	private static Log _log = LogFactory.getLog(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 initilization	 * </p>	 * <p>	 * Quartz requires a public empty constructor so that the	 * scheduler can instantiate the class whenever it needs.	 * </p>	 */	public ColorJob() {	}	/**	 * <p>	 * Called by the <code>{@link org.quartz.Scheduler}</code> when a	 * <code>{@link org.quartz.Trigger}</code> fires that is associated with	 * the <code>Job</code>.	 * </p>	 * 	 * @throws JobExecutionException	 *             if there is an exception while executing the job.	 */	public void execute(JobExecutionContext context)			throws JobExecutionException {		// This job simply prints out its job name and the		// date and time that it is running		String jobName = context.getJobDetail().getFullName();				// Grab and print passed parameters		JobDataMap data = context.getJobDetail().getJobDataMap();		String favoriteColor = data.getString(FAVORITE_COLOR);		int count = data.getInt(EXECUTION_COUNT);		_log.info("ColorJob: " + jobName + " executing at " + new Date() + "\n" +			"  favorite color is " + favoriteColor + "\n" + 			"  execution count (from job map) is " + count + "\n" + 			"  execution count (from job member variable) is " + _counter);				// increment the count and store it back into the 		// job map so that job state can be properly maintained		count++;		data.put(EXECUTION_COUNT, count);				// Increment the local member variable 		// This serves no real purpose since job state can not 		// be maintained via member variables!		_counter++;	}}