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.network;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.activemq.command.BrokerId;
  import org.apache.activemq.command.ConsumerId;
  import org.apache.activemq.command.ConsumerInfo;
  import org.apache.activemq.command.SubscriptionInfo;
  import org.apache.activemq.filter.DestinationFilter;
  import org.apache.activemq.transport.Transport;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Consolidates subscriptions
   */
  public class ConduitBridge extends DemandForwardingBridge {
      private static final Logger LOG = LoggerFactory.getLogger(ConduitBridge.class);
  
      /**
       * Constructor
       *
       * @param localBroker
       * @param remoteBroker
       */
      public ConduitBridge(NetworkBridgeConfiguration configuration, Transport localBroker, Transport remoteBroker) {
          super(configuration, localBroker, remoteBroker);
      }
  
      @Override
      protected DemandSubscription createDemandSubscription(ConsumerInfo info) throws IOException {
          if (addToAlreadyInterestedConsumers(info, false)) {
              return null; // don't want this subscription added
          }
          //add our original id to ourselves
          info.addNetworkConsumerId(info.getConsumerId());
          info.setSelector(null);
          return doCreateDemandSubscription(info);
      }
  
      protected boolean addToAlreadyInterestedConsumers(ConsumerInfo info, boolean isForcedDurable) {
          //If a network subscription and a queue check if isConduitNetworkQueueSubscriptions is true
          //If true then we want to try and conduit
          //For topics we always want to conduit regardless of network subscription or not
          if (info.isNetworkSubscription() && info.getDestination().isQueue() &&
                  !configuration.isConduitNetworkQueueSubscriptions()) {
              return false;
          }
          boolean matched = false;
  
          // search through existing subscriptions and see if we have a match
          for (DemandSubscription ds : subscriptionMapByLocalId.values()) {
              DestinationFilter filter = DestinationFilter.parseFilter(ds.getLocalInfo().getDestination());
              if (canConduit(ds) && filter.matches(info.getDestination())) {
                  LOG.debug("{} {} with ids {} matched (add interest) {}",
                          configuration.getBrokerName(), info, info.getNetworkConsumerIds(), ds);
                  // add the interest in the subscription
                  if (!info.isDurable()) {
                      ds.add(info.getConsumerId());
                      if (isForcedDurable) {
                          forcedDurableRemoteId.add(info.getConsumerId());
                          ds.addForcedDurableConsumer(info.getConsumerId());
                      }
                  } else {
                      //Handle the demand generated by proxy network subscriptions
                      //The broker path is case is normal
                      if (isProxyNSConsumerBrokerPath(info) &&
                              info.getSubscriptionName() != null && info.getSubscriptionName().startsWith(DURABLE_SUB_PREFIX)) {
                          final BrokerId[] path = info.getBrokerPath();
                          addProxyNetworkSubscriptionBrokerPath(ds, path, info.getSubscriptionName());
                      //This is the durable sync case on broker restart
                      } else if (isProxyNSConsumerClientId(info.getClientId()) &&
                              isProxyBridgeSubscription(info.getClientId(), info.getSubscriptionName())) {
                          addProxyNetworkSubscriptionClientId(ds, info.getClientId(), info.getSubscriptionName());
                      } else {
                  		ds.getDurableRemoteSubs().add(new SubscriptionInfo(info.getClientId(), info.getSubscriptionName()));
                  	}
                  }
                  matched = true;
                  // continue - we want interest to any existing DemandSubscriptions
              }
          }
          return matched;
      }
  
      // we want to conduit statically included consumers which are local networkSubs
      // but we don't want to conduit remote network queue subs i.e. (proxy proxy) consumers
      // unless isConduitNetworkQueueSubscriptions is true
      // We always want to conduit topic subscriptions
      private boolean canConduit(DemandSubscription ds) {
          return ds.isStaticallyIncluded() || ds.getRemoteInfo().getDestination().isTopic() ||
                  !ds.getRemoteInfo().isNetworkSubscription() ||
                  (ds.getRemoteInfo().getDestination().isQueue() && configuration.isConduitNetworkQueueSubscriptions());
      }
  
      @Override
      protected void removeDemandSubscription(ConsumerId id) throws IOException {
          List<DemandSubscription> tmpList = new ArrayList<DemandSubscription>();
  
          for (DemandSubscription ds : subscriptionMapByLocalId.values()) {
              if (ds.remove(id)) {
                  LOG.debug("{} on {} from {} removed interest for: {} from {}",
                          configuration.getBrokerName(), localBroker, remoteBrokerName, id, ds);
              }
              if (ds.isEmpty()) {
                  tmpList.add(ds);
              }
          }
  
          for (DemandSubscription ds : tmpList) {
              removeSubscription(ds);
              LOG.debug("{} on {} from {} removed {}",
                      configuration.getBrokerName(), localBroker, remoteBrokerName, ds);
          }
      }
  }
  