1 /**
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.activemq.transport.multicast;
18
19 import java.io.IOException;
20 import java.net.DatagramSocket;
21 import java.net.InetAddress;
22 import java.net.InetSocketAddress;
23 import java.net.MulticastSocket;
24 import java.net.SocketAddress;
25 import java.net.SocketException;
26 import java.net.URI;
27 import java.net.UnknownHostException;
28
29 import org.apache.activemq.openwire.OpenWireFormat;
30 import org.apache.activemq.transport.udp.CommandChannel;
31 import org.apache.activemq.transport.udp.CommandDatagramSocket;
32 import org.apache.activemq.transport.udp.DatagramHeaderMarshaller;
33 import org.apache.activemq.transport.udp.UdpTransport;
34 import org.apache.activemq.util.ServiceStopper;
35 import org.apache.commons.logging.Log;
36 import org.apache.commons.logging.LogFactory;
37
38 /**
39 * A multicast based transport.
40 *
41 * @version $Revision: 564814 $
42 */
43 public class MulticastTransport extends UdpTransport {
44
45 private static final Log LOG = LogFactory.getLog(MulticastTransport.class);
46
47 private static final int DEFAULT_IDLE_TIME = 5000;
48
49 private MulticastSocket socket;
50 private InetAddress mcastAddress;
51 private int mcastPort;
52 private int timeToLive = 1;
53 private boolean loopBackMode;
54 private long keepAliveInterval = DEFAULT_IDLE_TIME;
55
56 public MulticastTransport(OpenWireFormat wireFormat, URI remoteLocation) throws UnknownHostException, IOException {
57 super(wireFormat, remoteLocation);
58 }
59
60 public long getKeepAliveInterval() {
61 return keepAliveInterval;
62 }
63
64 public void setKeepAliveInterval(long keepAliveInterval) {
65 this.keepAliveInterval = keepAliveInterval;
66 }
67
68 public boolean isLoopBackMode() {
69 return loopBackMode;
70 }
71
72 public void setLoopBackMode(boolean loopBackMode) {
73 this.loopBackMode = loopBackMode;
74 }
75
76 public int getTimeToLive() {
77 return timeToLive;
78 }
79
80 public void setTimeToLive(int timeToLive) {
81 this.timeToLive = timeToLive;
82 }
83
84 protected String getProtocolName() {
85 return "Multicast";
86 }
87
88 protected String getProtocolUriScheme() {
89 return "multicast://";
90 }
91
92 protected void bind(DatagramSocket socket, SocketAddress localAddress) throws SocketException {
93 }
94
95 protected void doStop(ServiceStopper stopper) throws Exception {
96 super.doStop(stopper);
97 if (socket != null) {
98 try {
99 socket.leaveGroup(getMulticastAddress());
100 } catch (IOException e) {
101 stopper.onException(this, e);
102 }
103 socket.close();
104 }
105 }
106
107 protected CommandChannel createCommandChannel() throws IOException {
108 socket = new MulticastSocket(mcastPort);
109 socket.setLoopbackMode(loopBackMode);
110 socket.setTimeToLive(timeToLive);
111
112 LOG.debug("Joining multicast address: " + getMulticastAddress());
113 socket.joinGroup(getMulticastAddress());
114 socket.setSoTimeout((int)keepAliveInterval);
115
116 return new CommandDatagramSocket(this, getWireFormat(), getDatagramSize(), getTargetAddress(), createDatagramHeaderMarshaller(), getSocket());
117 }
118
119 protected InetAddress getMulticastAddress() {
120 return mcastAddress;
121 }
122
123 protected MulticastSocket getSocket() {
124 return socket;
125 }
126
127 protected void setSocket(MulticastSocket socket) {
128 this.socket = socket;
129 }
130
131 protected InetSocketAddress createAddress(URI remoteLocation) throws UnknownHostException, IOException {
132 this.mcastAddress = InetAddress.getByName(remoteLocation.getHost());
133 this.mcastPort = remoteLocation.getPort();
134 return new InetSocketAddress(mcastAddress, mcastPort);
135 }
136
137 protected DatagramHeaderMarshaller createDatagramHeaderMarshaller() {
138 return new MulticastDatagramHeaderMarshaller("udp://dummyHostName:" + getPort());
139 }
140
141 }
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