/*  * 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. *  */package org.quartz.spi;import org.quartz.SchedulerException;/** * <p> * An InstanceIdGenerator is responsible for generating the clusterwide unique  * instance id for a <code>Scheduler</code> node. * </p> *  * <p> * This interface may be of use to those wishing to have specific control over  * the mechanism by which the <code>Scheduler</code> instances in their  * application are named. * </p> *  * @see org.quartz.simpl.SimpleInstanceIdGenerator */public interface InstanceIdGenerator {    /**     * Generate the instance id for a <code>Scheduler</code>     *      * @return The clusterwide unique instance id.     */    String generateInstanceId() throws SchedulerException;}