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 net.sf.ehcache.CacheException;
020 import net.sf.ehcache.Ehcache;
021 import net.sf.ehcache.Element;
022
023 import org.apache.camel.Exchange;
024 import org.apache.commons.logging.Log;
025 import org.apache.commons.logging.LogFactory;
026
027 public class CacheEventListener implements net.sf.ehcache.event.CacheEventListener {
028
029 private static final transient Log LOG = LogFactory.getLog(CacheEventListener.class);
030 CacheConsumer cacheConsumer;
031
032 public CacheEventListener() {
033 super();
034 }
035
036 public CacheEventListener(CacheConsumer cacheConsumer) {
037 super();
038 this.cacheConsumer = cacheConsumer;
039 }
040
041 public void notifyElementEvicted(Ehcache cache, Element element) {
042 if (LOG.isDebugEnabled()) {
043 LOG.debug("Element" + element.toString() + " is being evicted from cache " + cache.getName());
044 }
045 }
046
047 public void notifyElementExpired(Ehcache cache, Element element) {
048 if (LOG.isDebugEnabled()) {
049 LOG.debug("Element" + element.toString() + " has expired in cache " + cache.getName());
050 }
051 }
052
053 public void notifyElementPut(Ehcache cache, Element element)
054 throws CacheException {
055 if (LOG.isDebugEnabled()) {
056 LOG.debug("Element" + element.toString() + " has just been added/put in cache " + cache.getName());
057 }
058 dispatchExchange(cache, element, "ADD");
059 }
060
061 public void notifyElementRemoved(Ehcache cache, Element element)
062 throws CacheException {
063
064 if (LOG.isDebugEnabled()) {
065 LOG.debug("Element" + element.toString() + " has just been removed from cache " + cache.getName());
066 }
067 dispatchExchange(cache, element, "DELETE");
068 }
069
070 public void notifyElementUpdated(Ehcache cache, Element element)
071 throws CacheException {
072 if (LOG.isDebugEnabled()) {
073 LOG.debug("Element" + element.toString() + " has just been updated in cache " + cache.getName());
074 }
075 dispatchExchange(cache, element, "UPDATE");
076 }
077
078 public void notifyRemoveAll(Ehcache cache) {
079 if (LOG.isDebugEnabled()) {
080 LOG.debug("Cache " + cache.getName() + " is being emptied and all elements removed");
081 }
082 dispatchExchange(cache, null, "DELETEALL");
083
084 }
085
086 private void dispatchExchange(Ehcache cache, Element element, String operation) {
087 Exchange exchange;
088
089 if (LOG.isDebugEnabled()) {
090 LOG.debug("Consumer Dispatching the Exchange containing the Element " + element.toString() + " in cache " + cache.getName());
091 }
092 if (element == null) {
093 exchange = cacheConsumer.getEndpoint().createCacheExchange(operation, "", "");
094 } else {
095 exchange = cacheConsumer.getEndpoint().createCacheExchange(operation, (String) element.getObjectKey(), element.getObjectValue());
096 }
097 try {
098 cacheConsumer.getProcessor().process(exchange);
099 } catch (Exception e) {
100 throw new CacheException("Error in consumer while dispatching exchange containing key "
101 + (element != null ? element.getObjectKey() : null) + " for further processing", e);
102 }
103 }
104
105 public CacheConsumer getCacheConsumer() {
106 return cacheConsumer;
107 }
108
109 public void setCacheConsumer(CacheConsumer cacheConsumer) {
110 this.cacheConsumer = cacheConsumer;
111 }
112
113 public void dispose() {
114 // noop
115 }
116
117 public Object clone() throws CloneNotSupportedException {
118 return super.clone();
119 }
120
121 }