| /* |
| * 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.util; |
| |
| /* |
| * Abstract class for CqListener. Utility class that implements all methods in |
| * <code>CqListener</code> with empty implementations. Applications can subclass this class and only |
| * override the methods of interest. |
| * |
| * @since GemFire 5.1 |
| */ |
| |
| import org.apache.geode.cache.query.CqEvent; |
| import org.apache.geode.cache.query.CqListener; |
| |
| public abstract class CqListenerAdapter implements CqListener { |
| |
| /** |
| * An event occurred that modifies the results of the query. This event does not contain an error. |
| */ |
| @Override |
| public void onEvent(CqEvent aCqEvent) {} |
| |
| /** |
| * An error occurred in the processing of a CQ. This event does contain an error. The newValue and |
| * oldValue in the event may or may not be available, and will be null if not available. |
| */ |
| @Override |
| public void onError(CqEvent aCqEvent) {} |
| |
| /** |
| * Called when the CQ is closed, the base region is destroyed, when the cache is closed, or when |
| * this listener is removed from a CqQuery using a <code>CqAttributesMutator</code>. |
| * |
| * <p> |
| * Implementations should cleanup any external resources such as database connections. Any runtime |
| * exceptions this method throws will be logged. |
| * |
| * <p> |
| * It is possible for this method to be called multiple times on a single callback instance, so |
| * implementations must be tolerant of this. |
| * |
| * @see org.apache.geode.cache.CacheCallback#close |
| */ |
| @Override |
| public void close() {} |
| } |