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/**
* 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.udp;
import java.io.EOFException;
import java.io.IOException;
import java.net.BindException;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.SocketException;
import java.net.URI;
import java.net.UnknownHostException;
import java.nio.channels.AsynchronousCloseException;
import java.nio.channels.DatagramChannel;
import org.apache.activemq.Service;
import org.apache.activemq.command.Command;
import org.apache.activemq.command.Endpoint;
import org.apache.activemq.openwire.OpenWireFormat;
import org.apache.activemq.transport.Transport;
import org.apache.activemq.transport.TransportThreadSupport;
import org.apache.activemq.transport.reliable.ExceptionIfDroppedReplayStrategy;
import org.apache.activemq.transport.reliable.ReplayBuffer;
import org.apache.activemq.transport.reliable.ReplayStrategy;
import org.apache.activemq.transport.reliable.Replayer;
import org.apache.activemq.util.InetAddressUtil;
import org.apache.activemq.util.IntSequenceGenerator;
import org.apache.activemq.util.ServiceStopper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An implementation of the {@link Transport} interface using raw UDP
*
*
*/
public class UdpTransport extends TransportThreadSupport implements Transport, Service, Runnable {
private static final Logger LOG = LoggerFactory.getLogger(UdpTransport.class);
private static final int MAX_BIND_ATTEMPTS = 50;
private static final long BIND_ATTEMPT_DELAY = 100;
private CommandChannel commandChannel;
private OpenWireFormat wireFormat;
private ByteBufferPool bufferPool;
private ReplayStrategy replayStrategy = new ExceptionIfDroppedReplayStrategy();
private ReplayBuffer replayBuffer;
private int datagramSize = 4 * 1024;
private SocketAddress targetAddress;
private SocketAddress originalTargetAddress;
private DatagramChannel channel;
private boolean trace;
private boolean useLocalHost = false;
private int port;
private int minmumWireFormatVersion;
private String description;
private IntSequenceGenerator sequenceGenerator;
private boolean replayEnabled = true;
protected UdpTransport(OpenWireFormat wireFormat) throws IOException {
this.wireFormat = wireFormat;
}
public UdpTransport(OpenWireFormat wireFormat, URI remoteLocation) throws UnknownHostException, IOException {
this(wireFormat);
this.targetAddress = createAddress(remoteLocation);
description = remoteLocation.toString() + "@";
}
public UdpTransport(OpenWireFormat wireFormat, SocketAddress socketAddress) throws IOException {
this(wireFormat);
this.targetAddress = socketAddress;
this.description = getProtocolName() + "ServerConnection@";
}
/**
* Used by the server transport
*/
public UdpTransport(OpenWireFormat wireFormat, int port) throws UnknownHostException, IOException {
this(wireFormat);
this.port = port;
this.targetAddress = null;
this.description = getProtocolName() + "Server@";
}
/**
* Creates a replayer for working with the reliable transport
*/
public Replayer createReplayer() throws IOException {
if (replayEnabled) {
return getCommandChannel();
}
return null;
}
/**
* A one way asynchronous send
*/
public void oneway(Object command) throws IOException {
oneway(command, targetAddress);
}
/**
* A one way asynchronous send to a given address
*/
public void oneway(Object command, SocketAddress address) throws IOException {
if (LOG.isDebugEnabled()) {
LOG.debug("Sending oneway from: " + this + " to target: " + targetAddress + " command: " + command);
}
checkStarted();
commandChannel.write((Command)command, address);
}
/**
* @return pretty print of 'this'
*/
public String toString() {
if (description != null) {
return description + port;
} else {
return getProtocolUriScheme() + targetAddress + "@" + port;
}
}
/**
* reads packets from a Socket
*/
public void run() {
LOG.trace("Consumer thread starting for: " + toString());
while (!isStopped()) {
try {
Command command = commandChannel.read();
doConsume(command);
} catch (AsynchronousCloseException e) {
// DatagramChannel closed
try {
stop();
} catch (Exception e2) {
LOG.warn("Caught in: " + this + " while closing: " + e2 + ". Now Closed", e2);
}
} catch (SocketException e) {
// DatagramSocket closed
LOG.debug("Socket closed: " + e, e);
try {
stop();
} catch (Exception e2) {
LOG.warn("Caught in: " + this + " while closing: " + e2 + ". Now Closed", e2);
}
} catch (EOFException e) {
// DataInputStream closed
LOG.debug("Socket closed: " + e, e);
try {
stop();
} catch (Exception e2) {
LOG.warn("Caught in: " + this + " while closing: " + e2 + ". Now Closed", e2);
}
} catch (Exception e) {
try {
stop();
} catch (Exception e2) {
LOG.warn("Caught in: " + this + " while closing: " + e2 + ". Now Closed", e2);
}
if (e instanceof IOException) {
onException((IOException)e);
} else {
LOG.error("Caught: " + e, e);
e.printStackTrace();
}
}
}
}
/**
* We have received the WireFormatInfo from the server on the actual channel
* we should use for all future communication with the server, so lets set
* the target to be the actual channel that the server has chosen for us to
* talk on.
*/
public void setTargetEndpoint(Endpoint newTarget) {
if (newTarget instanceof DatagramEndpoint) {
DatagramEndpoint endpoint = (DatagramEndpoint)newTarget;
SocketAddress address = endpoint.getAddress();
if (address != null) {
if (originalTargetAddress == null) {
originalTargetAddress = targetAddress;
}
targetAddress = address;
commandChannel.setTargetAddress(address);
}
}
}
// Properties
// -------------------------------------------------------------------------
public boolean isTrace() {
return trace;
}
public void setTrace(boolean trace) {
this.trace = trace;
}
public int getDatagramSize() {
return datagramSize;
}
public void setDatagramSize(int datagramSize) {
this.datagramSize = datagramSize;
}
public boolean isUseLocalHost() {
return useLocalHost;
}
/**
* Sets whether 'localhost' or the actual local host name should be used to
* make local connections. On some operating systems such as Macs its not
* possible to connect as the local host name so localhost is better.
*/
public void setUseLocalHost(boolean useLocalHost) {
this.useLocalHost = useLocalHost;
}
public CommandChannel getCommandChannel() throws IOException {
if (commandChannel == null) {
commandChannel = createCommandChannel();
}
return commandChannel;
}
/**
* Sets the implementation of the command channel to use.
*/
public void setCommandChannel(CommandDatagramChannel commandChannel) {
this.commandChannel = commandChannel;
}
public ReplayStrategy getReplayStrategy() {
return replayStrategy;
}
/**
* Sets the strategy used to replay missed datagrams
*/
public void setReplayStrategy(ReplayStrategy replayStrategy) {
this.replayStrategy = replayStrategy;
}
public int getPort() {
return port;
}
/**
* Sets the port to connect on
*/
public void setPort(int port) {
this.port = port;
}
public int getMinmumWireFormatVersion() {
return minmumWireFormatVersion;
}
public void setMinmumWireFormatVersion(int minmumWireFormatVersion) {
this.minmumWireFormatVersion = minmumWireFormatVersion;
}
public OpenWireFormat getWireFormat() {
return wireFormat;
}
public IntSequenceGenerator getSequenceGenerator() {
if (sequenceGenerator == null) {
sequenceGenerator = new IntSequenceGenerator();
}
return sequenceGenerator;
}
public void setSequenceGenerator(IntSequenceGenerator sequenceGenerator) {
this.sequenceGenerator = sequenceGenerator;
}
public boolean isReplayEnabled() {
return replayEnabled;
}
/**
* Sets whether or not replay should be enabled when using the reliable
* transport. i.e. should we maintain a buffer of messages that can be
* replayed?
*/
public void setReplayEnabled(boolean replayEnabled) {
this.replayEnabled = replayEnabled;
}
public ByteBufferPool getBufferPool() {
if (bufferPool == null) {
bufferPool = new DefaultBufferPool();
}
return bufferPool;
}
public void setBufferPool(ByteBufferPool bufferPool) {
this.bufferPool = bufferPool;
}
public ReplayBuffer getReplayBuffer() {
return replayBuffer;
}
public void setReplayBuffer(ReplayBuffer replayBuffer) throws IOException {
this.replayBuffer = replayBuffer;
getCommandChannel().setReplayBuffer(replayBuffer);
}
// Implementation methods
// -------------------------------------------------------------------------
/**
* Creates an address from the given URI
*/
protected InetSocketAddress createAddress(URI remoteLocation) throws UnknownHostException, IOException {
String host = resolveHostName(remoteLocation.getHost());
return new InetSocketAddress(host, remoteLocation.getPort());
}
protected String resolveHostName(String host) throws UnknownHostException {
String localName = InetAddressUtil.getLocalHostName();
if (localName != null && isUseLocalHost()) {
if (localName.equals(host)) {
return "localhost";
}
}
return host;
}
protected void doStart() throws Exception {
getCommandChannel().start();
super.doStart();
}
protected CommandChannel createCommandChannel() throws IOException {
SocketAddress localAddress = createLocalAddress();
channel = DatagramChannel.open();
channel = connect(channel, targetAddress);
DatagramSocket socket = channel.socket();
bind(socket, localAddress);
if (port == 0) {
port = socket.getLocalPort();
}
return createCommandDatagramChannel();
}
protected CommandChannel createCommandDatagramChannel() {
return new CommandDatagramChannel(this, getWireFormat(), getDatagramSize(), getTargetAddress(), createDatagramHeaderMarshaller(), getChannel(), getBufferPool());
}
protected void bind(DatagramSocket socket, SocketAddress localAddress) throws IOException {
channel.configureBlocking(true);
if (LOG.isDebugEnabled()) {
LOG.debug("Binding to address: " + localAddress);
}
//
// We have noticed that on some platfoms like linux, after you close
// down
// a previously bound socket, it can take a little while before we can
// bind it again.
//
for (int i = 0; i < MAX_BIND_ATTEMPTS; i++) {
try {
socket.bind(localAddress);
return;
} catch (BindException e) {
if (i + 1 == MAX_BIND_ATTEMPTS) {
throw e;
}
try {
Thread.sleep(BIND_ATTEMPT_DELAY);
} catch (InterruptedException e1) {
Thread.currentThread().interrupt();
throw e;
}
}
}
}
protected DatagramChannel connect(DatagramChannel channel, SocketAddress targetAddress2) throws IOException {
// TODO
// connect to default target address to avoid security checks each time
// channel = channel.connect(targetAddress);
return channel;
}
protected SocketAddress createLocalAddress() {
return new InetSocketAddress(port);
}
protected void doStop(ServiceStopper stopper) throws Exception {
if (channel != null) {
channel.close();
}
}
protected DatagramHeaderMarshaller createDatagramHeaderMarshaller() {
return new DatagramHeaderMarshaller();
}
protected String getProtocolName() {
return "Udp";
}
protected String getProtocolUriScheme() {
return "udp://";
}
protected SocketAddress getTargetAddress() {
return targetAddress;
}
protected DatagramChannel getChannel() {
return channel;
}
protected void setChannel(DatagramChannel channel) {
this.channel = channel;
}
public InetSocketAddress getLocalSocketAddress() {
if (channel == null) {
return null;
} else {
return (InetSocketAddress)channel.socket().getLocalSocketAddress();
}
}
public String getRemoteAddress() {
if (targetAddress != null) {
return "" + targetAddress;
}
return null;
}
public int getReceiveCounter() {
if (commandChannel == null) {
return 0;
}
return commandChannel.getReceiveCounter();
}
}