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.processor.cache;
018    
019    import net.sf.ehcache.CacheManager;
020    import net.sf.ehcache.Ehcache;
021    
022    import org.apache.commons.logging.Log;
023    import org.apache.commons.logging.LogFactory;
024    
025    public class CacheValidate {
026        private static final transient Log LOG = LogFactory.getLog(CacheValidate.class);
027    
028        public boolean isValid(CacheManager cacheManager, String cacheName, String key) {
029            if (LOG.isTraceEnabled()) {
030                LOG.trace("Cache Name: " + cacheName);
031            }
032    
033            if (!cacheManager.cacheExists(cacheName)) {
034                if (LOG.isDebugEnabled()) {
035                    LOG.debug("No existing Cache found with name: " + cacheName
036                            + ". Please ensure a cache is first instantiated using a Cache Consumer or Cache Producer."
037                            + " Replacement will not be performed since the cache " + cacheName + "does not presently exist");
038                }
039                return false;
040            }
041    
042            if (LOG.isDebugEnabled()) {
043                LOG.debug("Found an existing cache: " + cacheName);
044            }
045    
046            if (LOG.isTraceEnabled()) {
047                LOG.trace("Cache " + cacheName + " currently contains " + cacheManager.getCache(cacheName).getSize() + " elements");
048            }
049            Ehcache cache = cacheManager.getCache(cacheName);
050    
051            if (!cache.isKeyInCache(key)) {
052                if (LOG.isDebugEnabled()) {
053                    LOG.debug("No Key with name: " + key
054                            + "presently exists in the cache. It is also possible that the key may have expired in the cache."
055                            + " Replacement will not be performed until an appropriate key/value pair is added to (or) found in the cache.");
056                }
057                return false;
058            }
059    
060            return true;
061        }
062    
063    }