content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.apache.activemq.broker.region.group;
  
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  import org.apache.activemq.broker.region.Destination;
  import org.apache.activemq.command.ConsumerId;
  
  /**
   * A simple implementation which tracks every individual GroupID value but
   * which can become a memory leak if clients die before they complete a message
   * group.
   * 
   * 
   */
  public class SimpleMessageGroupMap implements MessageGroupMap {
      private Map<String, ConsumerId> map = new ConcurrentHashMap<String, ConsumerId>();
      
      public void put(String groupId, ConsumerId consumerId) {
          map.put(groupId, consumerId);
      }
  
      public ConsumerId get(String groupId) {
          return map.get(groupId);
      }
  
      public ConsumerId removeGroup(String groupId) {
          return map.remove(groupId);
      }
  
      public MessageGroupSet removeConsumer(ConsumerId consumerId) {
          SimpleMessageGroupSet ownedGroups = new SimpleMessageGroupSet();
          for (Iterator<String> iter = map.keySet().iterator(); iter.hasNext();) {
              String group = iter.next();
              ConsumerId owner = map.get(group);
              if (owner.equals(consumerId)) {
                  ownedGroups.add(group);
                  iter.remove();
              }
          }
          return ownedGroups;
      }
  
  
      @Override
      public void removeAll(){
          map.clear();
      }
  
      @Override
      public Map<String, String> getGroups() {
          Map<String,String> result = new HashMap<String,String>();
          for (Map.Entry<String,ConsumerId>entry:map.entrySet()){
              result.put(entry.getKey(),entry.getValue().toString());
          }
          return result;
      }
  
      @Override
      public String getType() {
          return "simple";
      }
  
      public void setDestination(Destination destination) {}
  
      public String toString() {
          return "message groups: " + map.size();
      }
  
  }
  