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}