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
018 package org.apache.camel.component.cache;
019
020 import java.io.InputStream;
021 import java.io.Serializable;
022
023 import net.sf.ehcache.Cache;
024 import net.sf.ehcache.CacheException;
025 import net.sf.ehcache.CacheManager;
026 import net.sf.ehcache.Ehcache;
027 import net.sf.ehcache.Element;
028
029 import org.apache.camel.Endpoint;
030 import org.apache.camel.Exchange;
031 import org.apache.camel.component.cache.factory.CacheManagerFactory;
032 import org.apache.camel.impl.DefaultProducer;
033 import org.apache.commons.logging.Log;
034 import org.apache.commons.logging.LogFactory;
035
036 public class CacheProducer extends DefaultProducer {
037 private static final transient Log LOG = LogFactory.getLog(CacheProducer.class);
038 Endpoint endpoint;
039 CacheConfiguration config;
040 CacheManager cacheManager;
041 Ehcache cache;
042
043 public CacheProducer(Endpoint endpoint, CacheConfiguration config) throws Exception {
044 super(endpoint);
045 this.endpoint = endpoint;
046 this.config = config;
047 }
048
049 public void process(Exchange exchange) throws Exception {
050
051 cacheManager = new CacheManagerFactory().instantiateCacheManager();
052
053 if (LOG.isTraceEnabled()) {
054 LOG.trace("Cache Name: " + config.getCacheName());
055 }
056 if (cacheManager.cacheExists(config.getCacheName())) {
057 if (LOG.isTraceEnabled()) {
058 LOG.trace("Found an existing cache: " + config.getCacheName());
059 LOG.trace("Cache " + config.getCacheName() + " currently contains " + cacheManager.getCache(config.getCacheName()).getSize() + " elements");
060 }
061 cache = cacheManager.getCache(config.getCacheName());
062 } else {
063 cache = new Cache(config.getCacheName(),
064 config.getMaxElementsInMemory(),
065 config.getMemoryStoreEvictionPolicy(),
066 config.isOverflowToDisk(),
067 config.getDiskStorePath(),
068 config.isEternal(),
069 config.getTimeToLiveSeconds(),
070 config.getTimeToIdleSeconds(),
071 config.isDiskPersistent(),
072 config.getDiskExpiryThreadIntervalSeconds(),
073 null);
074 cacheManager.addCache(cache);
075 if (LOG.isDebugEnabled()) {
076 LOG.debug("Added a new cache: " + cache.getName());
077 }
078 }
079
080
081 String key = (String) exchange.getIn().getHeader("CACHE_KEY");
082 String operation = (String) exchange.getIn().getHeader("CACHE_OPERATION");
083 if (operation == null) {
084 throw new CacheException("Operation property is not specified in the incoming exchange header."
085 + "A valid Operation property must be set to ADD, UPDATE, DELETE, DELETEALL");
086 }
087 if ((key == null) && (!operation.equalsIgnoreCase("DELETEALL"))) {
088 throw new CacheException("Cache Key is not specified in exchange either header or URL. Unable to add objects to the cache without a Key");
089 }
090
091 performCacheOperation(exchange, operation, key);
092 }
093
094 private void performCacheOperation(Exchange exchange, String operation, String key) throws Exception {
095 Object element;
096
097 Object body = exchange.getIn().getBody();
098 if (body instanceof Serializable) {
099 element = body;
100 } else {
101 InputStream is = exchange.getContext().getTypeConverter().mandatoryConvertTo(InputStream.class, body);
102
103 // Read InputStream into a byte[] buffer
104 byte[] buffer = new byte[is.available()];
105 int n = is.available();
106 for (int j = 0; j < n; j++) {
107 buffer[j] = (byte)is.read();
108 }
109
110 element = buffer;
111 }
112
113 if (operation.equalsIgnoreCase("ADD")) {
114 if (LOG.isDebugEnabled()) {
115 LOG.debug("Adding an element with key " + key + " into the Cache");
116 }
117 cache.put(new Element(key, element), true);
118 } else if (operation.equalsIgnoreCase("UPDATE")) {
119 if (LOG.isDebugEnabled()) {
120 LOG.debug("Updating an element with key " + key + " into the Cache");
121 }
122 cache.put(new Element(key, element), true);
123 } else if (operation.equalsIgnoreCase("DELETEALL")) {
124 if (LOG.isDebugEnabled()) {
125 LOG.debug("Deleting All elements from the Cache");
126 }
127 cache.removeAll();
128 } else if (operation.equalsIgnoreCase("DELETE")) {
129 if (LOG.isDebugEnabled()) {
130 LOG.debug("Deleting an element with key " + key + " into the Cache");
131 }
132 cache.remove(key, true);
133 }
134 }
135
136 }