/*  * 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.core;import org.quartz.Scheduler;import org.quartz.SchedulerConfigException;import org.quartz.SchedulerException;/** * <p> * Responsible for creating the instances of <code>{@link JobRunShell}</code> * to be used within the <class>{@link QuartzScheduler}</code> instance. * </p> *  * <p> * Although this interface looks a lot like an 'object pool', implementations * do not have to support the re-use of instances. If an implementation does * not wish to pool instances, then the <code>borrowJobRunShell()</code> * method would simply create a new instance, and the <code>returnJobRunShell * </code> method would do nothing. * </p> *  * @author James House */public interface JobRunShellFactory {    /*     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~     *      * Interface.     *      * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~     */    /**     * <p>     * Initialize the factory, providing a handle to the <code>Scheduler</code>     * that should be made available within the <code>JobRunShell</code> and     * the <code>JobExecutionCOntext</code> s within it, and a handle to the     * <code>SchedulingContext</code> that the shell will use in its own     * operations with the <code>JobStore</code>.     * </p>     */    public void initialize(Scheduler scheduler, SchedulingContext schedCtxt)            throws SchedulerConfigException;    /**     * <p>     * Called by the <code>{@link org.quartz.core.QuartzSchedulerThread}</code>     * to obtain instances of <code>{@link JobRunShell}</code>.     * </p>     */    public JobRunShell borrowJobRunShell() throws SchedulerException;    /**     * <p>     * Called by the <code>{@link org.quartz.core.QuartzSchedulerThread}</code>     * to return instances of <code>{@link JobRunShell}</code>.     * </p>     */    public void returnJobRunShell(JobRunShell jobRunShell);}