/**
*
* Copyright 2004 Hiram Chirino
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**/
package org.codehaus.activemq.store.cache;
import org.codehaus.activemq.message.ActiveMQMessage;
import org.codehaus.activemq.util.LRUCache;
/**
* A simple cache that stores messages in memory. Cache entries are evicted
* when they they get to old (A LRU cache is used).
*
* @version $Revision: 1.2 $
*/
public class SimpleMessageCache implements MessageCache {
private final LRUCache messages;
public SimpleMessageCache() {
this(1000);
}
public SimpleMessageCache(int cacheSize) {
this.messages = new LRUCache(cacheSize);
}
/**
* Gets a message that was previously <code>put</code> into this object.
*
* @param msgid
* @return null if the message was not previously put or if the message has expired out of the cache.
*/
synchronized public ActiveMQMessage get(String msgid) {
return (ActiveMQMessage) messages.get(msgid);
}
/**
* Puts a message into the cache.
*
* @param messageID
* @param message
*/
synchronized public void put(String messageID, ActiveMQMessage message) {
messages.put(messageID, message);
}
/**
* Remvoes a message from the cache.
*
* @param messageID
*/
synchronized public void remove(String messageID) {
messages.remove(messageID);
}
}