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.transport.multicast;
  
  import java.io.IOException;
  import java.net.DatagramSocket;
  import java.net.InetAddress;
  import java.net.InetSocketAddress;
  import java.net.MulticastSocket;
  import java.net.SocketAddress;
  import java.net.SocketException;
  import java.net.URI;
  import java.net.UnknownHostException;
  
  import org.apache.activemq.openwire.OpenWireFormat;
  import org.apache.activemq.transport.udp.CommandChannel;
  import org.apache.activemq.transport.udp.CommandDatagramSocket;
  import org.apache.activemq.transport.udp.DatagramHeaderMarshaller;
  import org.apache.activemq.transport.udp.UdpTransport;
  import org.apache.activemq.util.ServiceStopper;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A multicast based transport.
   * 
   * 
   */
  public class MulticastTransport extends UdpTransport {
  
      private static final Logger LOG = LoggerFactory.getLogger(MulticastTransport.class);
  
      private static final int DEFAULT_IDLE_TIME = 5000;
  
      private MulticastSocket socket;
      private InetAddress mcastAddress;
      private int mcastPort;
      private int timeToLive = 1;
      private boolean loopBackMode;
      private long keepAliveInterval = DEFAULT_IDLE_TIME;
  
      public MulticastTransport(OpenWireFormat wireFormat, URI remoteLocation) throws UnknownHostException, IOException {
          super(wireFormat, remoteLocation);
      }
  
      public long getKeepAliveInterval() {
          return keepAliveInterval;
      }
  
      public void setKeepAliveInterval(long keepAliveInterval) {
          this.keepAliveInterval = keepAliveInterval;
      }
  
      public boolean isLoopBackMode() {
          return loopBackMode;
      }
  
      public void setLoopBackMode(boolean loopBackMode) {
          this.loopBackMode = loopBackMode;
      }
  
      public int getTimeToLive() {
          return timeToLive;
      }
  
      public void setTimeToLive(int timeToLive) {
          this.timeToLive = timeToLive;
      }
  
      protected String getProtocolName() {
          return "Multicast";
      }
  
      protected String getProtocolUriScheme() {
          return "multicast://";
      }
  
      protected void bind(DatagramSocket socket, SocketAddress localAddress) throws SocketException {
      }
  
      protected void doStop(ServiceStopper stopper) throws Exception {
          super.doStop(stopper);
          if (socket != null) {
              try {
                  socket.leaveGroup(getMulticastAddress());
              } catch (IOException e) {
                  stopper.onException(this, e);
              }
              socket.close();
          }
      }
  
      protected CommandChannel createCommandChannel() throws IOException {
          socket = new MulticastSocket(mcastPort);
          socket.setLoopbackMode(loopBackMode);
          socket.setTimeToLive(timeToLive);
  
          LOG.debug("Joining multicast address: " + getMulticastAddress());
          socket.joinGroup(getMulticastAddress());
          socket.setSoTimeout((int)keepAliveInterval);
  
          return new CommandDatagramSocket(this, getWireFormat(), getDatagramSize(), getTargetAddress(), createDatagramHeaderMarshaller(), getSocket());
      }
  
      protected InetAddress getMulticastAddress() {
          return mcastAddress;
      }
  
      protected MulticastSocket getSocket() {
          return socket;
      }
  
      protected void setSocket(MulticastSocket socket) {
          this.socket = socket;
      }
  
      protected InetSocketAddress createAddress(URI remoteLocation) throws UnknownHostException, IOException {
          this.mcastAddress = InetAddress.getByName(remoteLocation.getHost());
          this.mcastPort = remoteLocation.getPort();
          return new InetSocketAddress(mcastAddress, mcastPort);
      }
  
      protected DatagramHeaderMarshaller createDatagramHeaderMarshaller() {
          return new MulticastDatagramHeaderMarshaller("udp://dummyHostName:" + getPort());
      }
  
  }
  