/*  * Copyright 2004-2005 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. *  *//* * Previously Copyright (c) 2001-2004 James House */package org.quartz;/** * <p> * The interface to be implemented by classes which represent a 'job' to be * performed. * </p> *  * <p> * Instances of <code>Job</code> must have a <code>public</code> * no-argument constructor. * </p> *  * <p> * <code>JobDataMap</code> provides a mechanism for 'instance member data' * that may be required by some implementations of this interface. * </p> *  * @see JobDetail * @see StatefulJob * @see Trigger * @see Scheduler *  * @author James House */public interface Job {    /*     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~     *      * Interface.     *      * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~     */    /**     * <p>     * Called by the <code>{@link Scheduler}</code> when a <code>{@link Trigger}</code>     * fires that is associated with the <code>Job</code>.     * </p>     *      * <p>     * The implementation may wish to set a      * {@link JobExecutionContext#setResult(Object) result} object on the      * {@link JobExecutionContext} before this method exits.  The result itself     * is meaningless to Quartz, but may be informative to      * <code>{@link JobListener}s</code> or      * <code>{@link TriggerListener}s</code> that are watching the job's      * execution.     * </p>     *      * @throws JobExecutionException     *           if there is an exception while executing the job.     */    void execute(JobExecutionContext context)        throws JobExecutionException;}