1 /*** 2 * 3 * Copyright 2004 Hiram Chirino 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 **/ 18 package org.codehaus.activemq.store.cache; 19 20 import org.codehaus.activemq.message.ActiveMQMessage; 21 import org.codehaus.activemq.util.LRUCache; 22 23 /*** 24 * A simple cache that stores messages in memory. Cache entries are evicted 25 * when they they get to old (A LRU cache is used). 26 * 27 * @version $Revision: 1.2 $ 28 */ 29 public class SimpleMessageCache implements MessageCache { 30 31 private final LRUCache messages; 32 33 public SimpleMessageCache() { 34 this(1000); 35 } 36 37 public SimpleMessageCache(int cacheSize) { 38 this.messages = new LRUCache(cacheSize); 39 } 40 41 /*** 42 * Gets a message that was previously <code>put</code> into this object. 43 * 44 * @param msgid 45 * @return null if the message was not previously put or if the message has expired out of the cache. 46 */ 47 synchronized public ActiveMQMessage get(String msgid) { 48 return (ActiveMQMessage) messages.get(msgid); 49 } 50 51 /*** 52 * Puts a message into the cache. 53 * 54 * @param messageID 55 * @param message 56 */ 57 synchronized public void put(String messageID, ActiveMQMessage message) { 58 messages.put(messageID, message); 59 } 60 61 /*** 62 * Remvoes a message from the cache. 63 * 64 * @param messageID 65 */ 66 synchronized public void remove(String messageID) { 67 messages.remove(messageID); 68 } 69 70 }