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.cluster;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.activemq.broker.Broker;
  import org.apache.activemq.broker.BrokerFilter;
  import org.apache.activemq.broker.ConnectionContext;
  import org.apache.activemq.broker.region.Subscription;
  import org.apache.activemq.command.ActiveMQDestination;
  import org.apache.activemq.command.ConsumerId;
  import org.apache.activemq.command.ConsumerInfo;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Monitors for client connections that may fail to another broker - but this
   * broker isn't aware they've gone. Can occur with network glitches or client
   * error
   * 
   * 
   */
  public class ConnectionSplitBroker extends BrokerFilter{
      private static final Logger LOG = LoggerFactory.getLogger(ConnectionSplitBroker.class);
      private List<ConsumerInfo>networkConsumerList = new ArrayList<ConsumerInfo>();
      public ConnectionSplitBroker(Broker next) {
          super(next);
      }
  
          
      public Subscription addConsumer(ConnectionContext context, ConsumerInfo info)
              throws Exception {
          ActiveMQDestination dest = info.getDestination();
  
          synchronized (networkConsumerList) {
              if (info.isNetworkSubscription()) {
                  networkConsumerList.add(info);
              } else {
                  if (!networkConsumerList.isEmpty()) {
                      List<ConsumerInfo> gcList = new ArrayList<ConsumerInfo>();
                      for (ConsumerInfo nc : networkConsumerList) {
                          if (!nc.isNetworkConsumersEmpty()) {
                              
                              for (ConsumerId id : nc.getNetworkConsumerIds()) {
                                  
                                  if (id.equals(info.getConsumerId())) {
                                      nc.removeNetworkConsumerId(id);
                                      if (nc.isNetworkConsumersEmpty()) {
                                          gcList.add(nc);
                                      }
                                  }
                              }
                          }
                      }
                      for (ConsumerInfo nc : gcList) {
                          networkConsumerList.remove(nc);
                          super.removeConsumer(context, nc);
                          LOG.warn("Removed stale network consumer {}", nc);
                      }
                  }
              }
          }
  
          return super.addConsumer(context, info);
      }
  
      public void removeConsumer(ConnectionContext context, ConsumerInfo info) throws Exception {
          if (info.isNetworkSubscription()) {
  
              synchronized (networkConsumerList) {
                  networkConsumerList.remove(info);
              }
          }
          super.removeConsumer(context, info);
      }
  }
  