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+/*
+ * Copyright (c) 2011 Oracle and/or its affiliates. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - 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.
+ *
+ * - Neither the name of Oracle nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS 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 THE COPYRIGHT OWNER OR
+ * 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.
+ */
+
+/*
+ * This source code is provided to illustrate the usage of a given feature
+ * or technique and has been deliberately simplified. Additional steps
+ * required for a production-quality application, such as security checks,
+ * input validation and proper error handling, might not be present in
+ * this sample code.
+ */
+
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
+import java.net.StandardSocketOptions;
+import java.nio.channels.*;
+import java.util.*;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Implements a chat server, this class holds the list of {@code clients} connected to the server.
+ * It sets up a server socket using AsynchronousServerSocketChannel listening to a specified port.
+ */
+public class ChatServer implements Runnable {
+ private final List<Client> connections = Collections.synchronizedList(new ArrayList<Client>());
+ private int port;
+ private final AsynchronousServerSocketChannel listener;
+ private final AsynchronousChannelGroup channelGroup;
+
+ /**
+ *
+ * @param port to listen to
+ * @throws java.io.IOException when failing to start the server
+ */
+ public ChatServer(int port) throws IOException {
+ channelGroup = AsynchronousChannelGroup.withFixedThreadPool(Runtime.getRuntime().availableProcessors(),
+ Executors.defaultThreadFactory());
+ this.port = port;
+ listener = createListener(channelGroup);
+ }
+
+ /**
+ *
+ * @return The socket address that the server is bound to
+ * @throws java.io.IOException if an I/O error occurs
+ */
+ public SocketAddress getSocketAddress() throws IOException {
+ return listener.getLocalAddress();
+ }
+
+ /**
+ * Start accepting connections
+ */
+ public void run() {
+
+ // call accept to wait for connections, tell it to call our CompletionHandler when there
+ // is a new incoming connection
+ listener.accept(null, new CompletionHandler<AsynchronousSocketChannel, Void>() {
+ @Override
+ public void completed(AsynchronousSocketChannel result, Void attachment) {
+ // request a new accept and handle the incoming connection
+ listener.accept(null, this);
+ handleNewConnection(result);
+ }
+
+ @Override
+ public void failed(Throwable exc, Void attachment) {
+ }
+ });
+ }
+
+ /**
+ * Shuts down the server
+ * @throws InterruptedException if terminated while waiting for shutdown
+ * @throws IOException if failing to shutdown the channel group
+ */
+ public void shutdown() throws InterruptedException, IOException {
+ channelGroup.shutdownNow();
+ channelGroup.awaitTermination(1, TimeUnit.SECONDS);
+ }
+
+ /*
+ * Creates a listener and starts accepting connections
+ */
+ private AsynchronousServerSocketChannel createListener(AsynchronousChannelGroup channelGroup) throws IOException {
+ final AsynchronousServerSocketChannel listener = openChannel(channelGroup);
+ listener.setOption(StandardSocketOptions.SO_REUSEADDR, true);
+ listener.bind(new InetSocketAddress(port));
+ return listener;
+ }
+
+ private AsynchronousServerSocketChannel openChannel(AsynchronousChannelGroup channelGroup) throws IOException {
+ return AsynchronousServerSocketChannel.open(channelGroup);
+ }
+
+ /**
+ * Creates a new client and adds it to the list of connections.
+ * Sets the clients handler to the initial state of NameReader
+ *
+ * @param channel the newly accepted channel
+ */
+ private void handleNewConnection(AsynchronousSocketChannel channel) {
+ Client client = new Client(channel, new ClientReader(this, new NameReader(this)));
+ try {
+ channel.setOption(StandardSocketOptions.TCP_NODELAY, true);
+ } catch (IOException e) {
+ // ignore
+ }
+ connections.add(client);
+ client.run();
+ }
+
+ /**
+ * Sends a message to all clients except the source.
+ * The method is synchronized as it is desired that messages are sent to
+ * all clients in the same order as received.
+ *
+ * @param client the message source
+ * @param message the message to be sent
+ */
+ public void writeMessageToClients(Client client, String message) {
+ synchronized (connections) {
+ for (Client clientConnection : connections) {
+ if (clientConnection != client) {
+ clientConnection.writeMessageFrom(client, message);
+ }
+ }
+ }
+ }
+
+ public void removeClient(Client client) {
+ connections.remove(client);
+ }
+
+ private static void usage() {
+ System.err.println("ChatServer [-port <port number>]");
+ System.exit(1);
+ }
+
+ public static void main(String[] args) throws IOException {
+ int port = 5000;
+ if (args.length != 0 && args.length != 2) {
+ usage();
+ } else if (args.length == 2) {
+ try {
+ if (args[0].equals("-port")) {
+ port = Integer.parseInt(args[1]);
+ } else {
+ usage();
+ }
+ } catch (NumberFormatException e) {
+ usage();
+ }
+ }
+ System.out.println("Running on port " + port);
+ new ChatServer(port).run();
+ }
+}