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 */
017package org.apache.activemq.broker.region.group;
018
019import java.util.Iterator;
020import java.util.Map;
021import java.util.concurrent.ConcurrentHashMap;
022
023import org.apache.activemq.command.ConsumerId;
024
025/**
026 * A simple implementation which tracks every individual GroupID value but
027 * which can become a memory leak if clients die before they complete a message
028 * group.
029 * 
030 * 
031 */
032public class SimpleMessageGroupMap implements MessageGroupMap {
033    private Map<String, ConsumerId> map = new ConcurrentHashMap<String, ConsumerId>();
034    
035    public void put(String groupId, ConsumerId consumerId) {
036        map.put(groupId, consumerId);
037    }
038
039    public ConsumerId get(String groupId) {
040        return map.get(groupId);
041    }
042
043    public ConsumerId removeGroup(String groupId) {
044        return map.remove(groupId);
045    }
046
047    public MessageGroupSet removeConsumer(ConsumerId consumerId) {
048        SimpleMessageGroupSet ownedGroups = new SimpleMessageGroupSet();
049        for (Iterator<String> iter = map.keySet().iterator(); iter.hasNext();) {
050            String group = iter.next();
051            ConsumerId owner = map.get(group);
052            if (owner.equals(consumerId)) {
053                ownedGroups.add(group);
054                iter.remove();
055            }
056        }
057        return ownedGroups;
058    }
059
060    public String toString() {
061        return "message groups: " + map.size();
062    }
063
064}