/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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.apache.geode.cache.query;

/**
 * This interface is used to modify the listeners that are associated with a CQ. Each CqQuery has an
 * CqAttributesMutator interface which supports modification of certain CQ attributes after the CQ
 * has been created.
 *
 * @since GemFire 5.5
 */
public interface CqAttributesMutator {

  /**
   * Adds a CQ listener to the end of the list of CQ listeners on this CqQuery.
   *
   * @param aListener the user defined CQ listener to add to the CqQuery.
   * @throws IllegalArgumentException if <code>aListener</code> is null
   */
  public void addCqListener(CqListener aListener);

  /**
   * Removes given CQ listener from the list of CQ listeners on this CqQuery. Does nothing if the
   * specified listener has not been added. If the specified listener has been added then will be
   * called on it; otherwise does nothing.
   *
   * @param aListener the CQ listener to remove from the CqQuery.
   * @throws IllegalArgumentException if <code>aListener</code> is null
   */
  public void removeCqListener(CqListener aListener);

  /**
   * Adds the given set CqListner on this CQ. If the CQ already has CqListeners, this removes those
   * old CQs and initializes with the newListeners.
   *
   * @param newListeners a possibly null or empty array of listeners to add to this CqQuery.
   * @throws IllegalArgumentException if the <code>newListeners</code> array has a null element
   */
  public void initCqListeners(CqListener[] newListeners);

}
