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: 658 $ 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 }