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.idempotent;
018
019 import java.util.HashMap;
020 import java.util.Map;
021
022 import org.apache.camel.util.LRUCache;
023
024 /**
025 * A memory based implementation of {@link MessageIdRepository}. Care should be
026 * taken to use a suitable underlying {@link Map} to avoid this class being a
027 * memory leak
028 *
029 * @version $Revision: 664441 $
030 */
031 public class MemoryMessageIdRepository implements MessageIdRepository {
032 private final Map cache;
033
034 public MemoryMessageIdRepository(Map set) {
035 this.cache = set;
036 }
037
038 /**
039 * Creates a new MemoryMessageIdRepository with a memory based repository.
040 * <b>Warning</b> this method should only really be used for testing as it
041 * will involve keeping all message IDs in RAM.
042 */
043 public static MessageIdRepository memoryMessageIdRepository() {
044 return memoryMessageIdRepository(new HashMap());
045 }
046
047 /**
048 * Creates a new MemoryMessageIdRepository with a memory based repository.
049 * <b>Warning</b> this method should only really be used for testing as it
050 * will involve keeping all message IDs in RAM.
051 */
052 public static MessageIdRepository memoryMessageIdRepository(int cacheSize) {
053 return memoryMessageIdRepository(new LRUCache(cacheSize));
054 }
055
056 /**
057 * Creates a new MemoryMessageIdRepository using the given {@link Map} to
058 * use to store the processed Message ID objects. Warning be careful of the
059 * implementation of Map you use as if you are not careful it could be a
060 * memory leak.
061 */
062 public static MessageIdRepository memoryMessageIdRepository(Map cache) {
063 return new MemoryMessageIdRepository(cache);
064 }
065
066 public boolean contains(String messageId) {
067 synchronized (cache) {
068 if (cache.containsKey(messageId)) {
069 return true;
070 } else {
071 cache.put(messageId, messageId);
072 return false;
073 }
074 }
075 }
076 }