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/*
* Copyright (c) 2001-2007 Sun Microsystems, Inc. All rights reserved.
*
* The Sun Project JXTA(TM) Software License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by Sun Microsystems, Inc. for JXTA(TM) technology."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
* not be used to endorse or promote products derived from this software
* without prior written permission. For written permission, please contact
* Project JXTA at http://www.jxta.org.
*
* 5. Products derived from this software may not be called "JXTA", nor may
* "JXTA" appear in their name, without prior written permission of Sun.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SUN
* MICROSYSTEMS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* JXTA is a registered trademark of Sun Microsystems, Inc. in the United
* States and other countries.
*
* Please see the license information page at :
* for instructions on use of
* the license in source files.
*
* ====================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of Project JXTA. For more information on Project JXTA, please see
* http://www.jxta.org.
*
* This license is based on the BSD license adopted by the Apache Foundation.
*/
package net.jxta.impl.endpoint.tcp;
import net.jxta.logging.Logging;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.*;
import java.nio.channels.*;
import java.nio.channels.spi.SelectorProvider;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.RejectedExecutionException;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* This server handles incoming unicast TCP connections
*/
public class IncomingUnicastServer implements Runnable {
/**
* Logger
*/
private static final Logger LOG = Logger.getLogger(IncomingUnicastServer.class.getName());
/**
* The transport which owns this server.
*/
private final TcpTransport transport;
/**
* The interface address the serverSocket will try to bind to.
*/
private final InetAddress serverBindLocalInterface;
/**
* The beginning of the port range the serverSocket will try to bind to.
*/
private final int serverBindStartLocalPort;
/**
* The port the serverSocket will try to bind to.
*/
private int serverBindPreferedLocalPort;
/**
* The end of the port range the serverSocket will try to bind to.
*/
private final int serverBindEndLocalPort;
/**
* The socket we listen for connections on.
*/
private ServerSocket serverSocket;
/**
* If true then the we are closed or closing.
*/
private volatile boolean closed = false;
/**
* The thread on which connection accepts will take place.
*/
private Thread acceptThread = null;
/**
* Channel Selector
*/
private Selector acceptSelector = null;
/**
* ServerSocket Channel
*/
private ServerSocketChannel serverSocChannel = null;
/**
* Constructor for the TCP server
*
* @param owner the TCP transport we are working for
* @param serverInterface the network interface to use.
* @param preferedPort the port we will be listening on.
* @param startPort starting port
* @param endPort the endport in port range
* @throws IOException if an io severe occurs
* @throws SecurityException if a security exception occurs
*/
public IncomingUnicastServer(TcpTransport owner, InetAddress serverInterface, int preferedPort, int startPort, int endPort) throws IOException, SecurityException {
this.transport = owner;
serverBindLocalInterface = serverInterface;
serverBindPreferedLocalPort = preferedPort;
serverBindStartLocalPort = startPort;
serverBindEndLocalPort = endPort;
openServerSocket();
}
/**
* Start this server.
*
* @return true if successfully started
*/
public synchronized boolean start() {
if (acceptThread != null) {
return false;
}
// Start daemon thread
acceptThread = new Thread(transport.group.getHomeThreadGroup(), this, "TCP Transport ServerSocket accept for " + transport.getPublicAddress());
acceptThread.setDaemon(true);
acceptThread.start();
return true;
}
/**
* Stop this server.
*/
public synchronized void stop() {
closed = true;
Thread temp = acceptThread;
if (null != temp) {
// interrupt does not seem to have an effect on threads blocked in accept.
temp.interrupt();
}
// Closing the socket works though.
try {
serverSocket.close();
} catch (IOException ignored) {
if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
LOG.log(Level.SEVERE, "IO error occured while closing server socket", ignored);
}
}
try {
acceptSelector.close();
} catch (IOException io) {
if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
LOG.log(Level.SEVERE, "IO error occured while closing Selectors", io);
}
}
}
/**
* Get the address of the network interface being used.
*
* @return the local socket address
*/
synchronized InetSocketAddress getLocalSocketAddress() {
ServerSocket localSocket = serverSocket;
if (null != localSocket) {
return (InetSocketAddress) localSocket.getLocalSocketAddress();
} else {
return null;
}
}
/**
* Get the start port range we are using
*
* @return starting port range
*/
int getStartPort() {
return serverBindStartLocalPort;
}
/**
* Get the end port range we are using
*
* @return the ending port range
*/
int getEndPort() {
return serverBindEndLocalPort;
}
/**
* Daemon where we wait for incoming connections.
*/
public void run() {
try {
if (Logging.SHOW_INFO && LOG.isLoggable(Level.INFO)) {
LOG.info("Server is ready to accept connections");
}
while (!closed) {
try {
if ((null == serverSocChannel) || !serverSocChannel.isOpen()) {
openServerSocket();
if (null == serverSocChannel) {
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.warning("Failed to open Server Channel");
}
break;
}
}
acceptSelector.select();
Iterator it = acceptSelector.selectedKeys().iterator();
while (it.hasNext()) {
SelectionKey key = it.next();
// remove it
it.remove();
if (key.isAcceptable()) {
ServerSocketChannel nextReady = (ServerSocketChannel) key.channel();
SocketChannel inputSocket = nextReady.accept();
if ((inputSocket == null) || (inputSocket.socket() == null)) {
continue;
}
MessengerBuilder builder = new MessengerBuilder(inputSocket, transport);
try {
transport.executor.execute(builder);
transport.incrementConnectionsAccepted();
} catch (RejectedExecutionException re) {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.log(Level.FINE, MessageFormat.format("Executor rejected task : {0}", builder.toString()), re);
}
}
}
}
} catch (ClosedSelectorException cse) {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Accept Selector closed");
}
if (closed) {
break;
}
} catch (InterruptedIOException woken) {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Accept Thread woken");
}
} catch (IOException e1) {
if (closed) {
break;
}
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.log(Level.WARNING,
"[1] ServerSocket.accept() failed on " + serverSocket.getInetAddress() + ":"+ serverSocket.getLocalPort(), e1);
}
} catch (SecurityException e2) {
if (closed) {
break;
}
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.log(Level.WARNING, "[2] ServerSocket.accept() failed on " + serverSocket.getInetAddress() + ":" + serverSocket.getLocalPort(), e2);
}
}
}
} catch (Throwable all) {
if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
LOG.log(Level.SEVERE, "Uncaught Throwable in thread :" + Thread.currentThread().getName(), all);
}
} finally {
synchronized (this) {
closed = true;
ServerSocket temp = serverSocket;
serverSocket = null;
if (null != temp) {
try {
temp.close();
} catch (IOException ignored) {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.log(Level.FINE, "Exception occurred while closing server socket", ignored);
}
}
}
acceptThread = null;
}
if (Logging.SHOW_INFO && LOG.isLoggable(Level.INFO)) {
LOG.info("Server has been shut down.");
}
}
}
public List rangeCheckShuffle(int start, int end) {
if ((start < 1) || (start > 65535)) {
throw new IllegalArgumentException("Invalid start port");
}
if ((end < 1) || (end > 65535) || (end < start)) {
throw new IllegalArgumentException("Invalid end port");
}
// fill the inRange array.
List inRange = new ArrayList();
for (int eachInRange = start; eachInRange < end; eachInRange++) {
inRange.add(eachInRange);
}
Collections.shuffle(inRange);
return inRange;
}
private synchronized void openServerSocket() throws IOException, SecurityException {
serverSocket = null;
while (true) {
try {
synchronized (this) {
acceptSelector = SelectorProvider.provider().openSelector();
serverSocChannel = ServerSocketChannel.open();
InetSocketAddress bindAddress;
if (-1 != serverBindPreferedLocalPort) {
bindAddress = new InetSocketAddress(serverBindLocalInterface, serverBindPreferedLocalPort);
serverSocket = serverSocChannel.socket();
int useBufferSize = Math.max(TcpTransport.RecvBufferSize, serverSocket.getReceiveBufferSize());
serverSocket.setReceiveBufferSize(useBufferSize);
serverSocket.bind(bindAddress, TcpTransport.MaxAcceptCnxBacklog);
} else {
List rangeList = rangeCheckShuffle(serverBindStartLocalPort, serverBindEndLocalPort);
while (!rangeList.isEmpty()) {
int tryPort = rangeList.remove(0);
if (tryPort > serverBindEndLocalPort) {
continue;
}
try {
bindAddress = new InetSocketAddress(serverBindLocalInterface, tryPort);
serverSocket = serverSocChannel.socket();
int useBufferSize = Math.max(TcpTransport.RecvBufferSize, serverSocket.getReceiveBufferSize());
serverSocket.setReceiveBufferSize(useBufferSize);
serverSocket.bind(bindAddress, TcpTransport.MaxAcceptCnxBacklog);
if (Logging.SHOW_INFO && LOG.isLoggable(Level.INFO)) {
LOG.info("ServerSocketChannel bound to " + bindAddress + ":" + tryPort);
}
} catch (SocketException failed) {
// this one is busy. try another.
} catch (Error err) {
// this can occur on some platforms where 2 instances are listenting on the same port
}
}
}
}
try {
// set the new channel non-blocking
serverSocChannel.configureBlocking(false);
serverSocChannel.register(acceptSelector, SelectionKey.OP_ACCEPT);
} catch (ClosedChannelException cce) {
if (Logging.SHOW_FINER && LOG.isLoggable(Level.FINER)) {
LOG.log(Level.FINER, "Channel closed.", cce);
}
}
if (Logging.SHOW_INFO && LOG.isLoggable(Level.INFO)) {
LOG.info("Server will accept connections at " + serverSocket.getLocalSocketAddress());
}
return;
} catch (BindException e0) {
if (-1 != serverBindStartLocalPort) {
serverBindPreferedLocalPort = (0 == serverBindStartLocalPort) ? 0 : -1;
continue;
}
closed = true;
if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
LOG.log(Level.SEVERE, "Cannot bind ServerSocket on " + serverBindLocalInterface + ":" + serverBindPreferedLocalPort, e0);
}
return;
}
}
}
/**
* An Executor task that creates a messenger from an incoming SocketChannel
* object.
*/
private static class MessengerBuilder implements Runnable {
private SocketChannel inputSocket;
private TcpTransport transport;
TcpMessenger newMessenger;
MessengerBuilder(SocketChannel inputSocket, TcpTransport transport) {
assert inputSocket.socket() != null;
this.inputSocket = inputSocket;
this.transport = transport;
}
/**
* {@inheritDoc}
*/
public void run() {
try {
if (inputSocket != null && inputSocket.isConnected()) {
newMessenger = new TcpMessenger(inputSocket, transport);
}
} catch (IOException io) {
// protect against invalid connections
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.log(Level.FINE, "Messenger creation failure", io);
}
} catch (Throwable all) {
if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.WARNING)) {
LOG.log(Level.SEVERE, "Uncaught Throwable", all);
}
}
}
}
}
