001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.component.cache;
018    
019    import java.util.ArrayList;
020    import java.util.List;
021    
022    import net.sf.ehcache.event.CacheEventListener;
023    
024    public class CacheEventListenerRegistry {
025    
026        private List<CacheEventListener> eventListeners;
027    
028        public CacheEventListenerRegistry() {
029        }
030    
031        public CacheEventListenerRegistry(List<CacheEventListener> eventListeners) {
032            this.eventListeners = eventListeners;
033        }
034    
035        public void addCacheEventListener(CacheEventListener listener) {
036            getEventListeners().add(listener);
037        }
038    
039        public synchronized List<CacheEventListener> getEventListeners() {
040            if (eventListeners == null) {
041                eventListeners = new ArrayList<CacheEventListener>();
042            }
043            return eventListeners;
044        }
045    
046        public int size() {
047            return eventListeners.size();
048        }
049    }