/**
*
* Copyright 2004 Protique Ltd
*
* Licensed 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.codehaus.activemq.transport.jrms;
import EDU.oswego.cs.dl.util.concurrent.SynchronizedBoolean;
import com.sun.multicast.reliable.RMException;
import com.sun.multicast.reliable.transport.RMPacketSocket;
import com.sun.multicast.reliable.transport.SessionDoneException;
import com.sun.multicast.reliable.transport.TransportProfile;
import com.sun.multicast.reliable.transport.lrmp.LRMPTransportProfile;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.codehaus.activemq.io.WireFormat;
import org.codehaus.activemq.message.Packet;
import org.codehaus.activemq.transport.TransportChannelSupport;
import org.codehaus.activemq.util.IdGenerator;
import javax.jms.JMSException;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.URI;
/**
* A JRMS implementation of a TransportChannel
*
* @version $Revision: 1.3 $
*/
public class JRMSTransportChannel extends TransportChannelSupport implements Runnable {
private static final int SOCKET_BUFFER_SIZE = 32 * 1024;
private static final Log log = LogFactory.getLog(JRMSTransportChannel.class);
private WireFormat wireFormat;
private SynchronizedBoolean closed;
private SynchronizedBoolean started;
private Thread thread; //need to change this - and use a thread pool
// need to see our own messages
private RMPacketSocket socket;
private IdGenerator idGenerator;
private String channelId;
private int port;
private InetAddress inetAddress;
private Object lock;
/**
* Construct basic helpers
*/
protected JRMSTransportChannel(WireFormat wireFormat) {
this.wireFormat = wireFormat;
idGenerator = new IdGenerator();
channelId = idGenerator.generateId();
closed = new SynchronizedBoolean(false);
started = new SynchronizedBoolean(false);
lock = new Object();
}
/**
* Connect to a remote Node - e.g. a Broker
*
* @param remoteLocation
* @throws JMSException
*/
public JRMSTransportChannel(WireFormat wireFormat, URI remoteLocation) throws JMSException {
this(wireFormat);
try {
this.port = remoteLocation.getPort();
this.inetAddress = InetAddress.getByName(remoteLocation.getHost());
LRMPTransportProfile profile = new LRMPTransportProfile(inetAddress, port);
profile.setTTL((byte) 1);
profile.setOrdered(true);
this.socket = profile.createRMPacketSocket(TransportProfile.SEND_RECEIVE);
}
catch (Exception ioe) {
ioe.printStackTrace();
JMSException jmsEx = new JMSException("Initialization of JRMSTransportChannel failed: " + ioe);
jmsEx.setLinkedException(ioe);
throw jmsEx;
}
}
/**
* close the channel
*/
public void stop() {
if (closed.commit(false, true)) {
super.stop();
try {
socket.close();
}
catch (Exception e) {
log.trace(toString() + " now closed");
}
}
}
/**
* start listeneing for events
*
* @throws JMSException if an error occurs
*/
public void start() throws JMSException {
if (started.commit(false, true)) {
thread = new Thread(this, toString());
if (isServerSide()) {
thread.setDaemon(true);
}
thread.start();
}
}
/**
* Asynchronously send a Packet
*
* @param packet
* @throws JMSException
*/
public void asyncSend(Packet packet) throws JMSException {
try {
DatagramPacket dpacket = createDatagramPacket(packet);
// lets sync to avoid concurrent writes
//synchronized (lock) {
socket.send(dpacket);
//}
}
catch (RMException rme) {
JMSException jmsEx = new JMSException("syncSend failed " + rme.getMessage());
jmsEx.setLinkedException(rme);
throw jmsEx;
}
catch (IOException e) {
JMSException jmsEx = new JMSException("asyncSend failed " + e.getMessage());
jmsEx.setLinkedException(e);
throw jmsEx;
}
}
public boolean isMulticast() {
return true;
}
/**
* reads packets from a Socket
*/
public void run() {
try {
while (!closed.get()) {
DatagramPacket dpacket = socket.receive();
Packet packet = wireFormat.readPacket(channelId, dpacket);
if (packet != null) {
doConsumePacket(packet);
}
}
log.trace("The socket peer is now closed");
//doClose(new IOException("Socket peer is now closed"));
stop();
}
catch (SessionDoneException e) {
// this isn't really an exception, it just indicates
// that the socket has closed normally
log.trace("Session completed", e);
stop();
}
catch (RMException ste) {
doClose(ste);
}
catch (IOException e) {
doClose(e);
}
}
/**
* Can this wireformat process packets of this version
* @param version the version number to test
* @return true if can accept the version
*/
public boolean canProcessWireFormatVersion(int version){
return wireFormat.canProcessWireFormatVersion(version);
}
/**
* @return the current version of this wire format
*/
public int getCurrentWireFormatVersion(){
return wireFormat.getCurrentWireFormatVersion();
}
protected DatagramPacket createDatagramPacket() {
DatagramPacket answer = new DatagramPacket(new byte[SOCKET_BUFFER_SIZE], SOCKET_BUFFER_SIZE);
answer.setPort(port);
answer.setAddress(inetAddress);
return answer;
}
protected DatagramPacket createDatagramPacket(Packet packet) throws IOException, JMSException {
DatagramPacket answer = wireFormat.writePacket(channelId, packet);
answer.setPort(port);
answer.setAddress(inetAddress);
return answer;
}
private void doClose(Exception ex) {
if (!closed.get()) {
JMSException jmsEx = new JMSException("Error reading socket: " + ex);
jmsEx.setLinkedException(ex);
onAsyncException(jmsEx);
stop();
}
}
/**
* pretty print for object
*
* @return String representation of this object
*/
public String toString() {
return "JRMSTransportChannel: " + socket;
}
public void forceDisconnect() {
// TODO: implement me.
throw new RuntimeException("Not yet Implemented.");
}
}