Example usage for java.nio.channels SocketChannel connect

List of usage examples for java.nio.channels SocketChannel connect

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Introduction

In this page you can find the example usage for java.nio.channels SocketChannel connect.

Prototype

public abstract boolean connect(SocketAddress remote) throws IOException;

Source Link

Document

Connects this channel's socket.

Usage

From source file:edu.hawaii.soest.kilonalu.tchain.TChainSource.java

/**
* A method used to the TCP socket of the remote source host for communication
* @param host       the name or IP address of the host to connect to for the
*                   socket connection (reading)
* @param portNumber the number of the TCP port to connect to (i.e. 2604)
*///w ww  .j a v  a 2s .com
protected SocketChannel getSocketConnection() {

    String host = getHostName();
    int portNumber = new Integer(getHostPort()).intValue();
    SocketChannel dataSocket = null;

    try {

        // create the socket channel connection to the data source via the 
        // converter serial2IP converter      
        dataSocket = SocketChannel.open();
        Socket tcpSocket = dataSocket.socket();
        tcpSocket.setTcpNoDelay(true);
        tcpSocket.setReceiveBufferSize(40);
        dataSocket.connect(new InetSocketAddress(host, portNumber));

        // if the connection to the source fails, also disconnect from the RBNB
        // server and return null
        if (!dataSocket.isConnected()) {
            dataSocket.close();
            disconnect();
            dataSocket = null;
        }
    } catch (UnknownHostException ukhe) {
        System.err.println("Unable to look up host: " + host + "\n");
        disconnect();
        dataSocket = null;
    } catch (IOException nioe) {
        System.err.println("Couldn't get I/O connection to: " + host);
        disconnect();
        dataSocket = null;
    } catch (Exception e) {
        disconnect();
        dataSocket = null;
    }
    return dataSocket;

}

From source file:com.cloud.agent.resource.virtualnetwork.VirtualRoutingResource.java

public String connect(final String ipAddress, final int port) {
    for (int i = 0; i <= _retry; i++) {
        SocketChannel sch = null;
        try {/*  w  w  w .j a  v  a 2  s . c  om*/
            if (s_logger.isDebugEnabled()) {
                s_logger.debug("Trying to connect to " + ipAddress);
            }
            sch = SocketChannel.open();
            sch.configureBlocking(true);

            final InetSocketAddress addr = new InetSocketAddress(ipAddress, port);
            sch.connect(addr);
            return null;
        } catch (final IOException e) {
            if (s_logger.isDebugEnabled()) {
                s_logger.debug("Could not connect to " + ipAddress);
            }
        } finally {
            if (sch != null) {
                try {
                    sch.close();
                } catch (final IOException e) {
                }
            }
        }
        try {
            Thread.sleep(_sleep);
        } catch (final InterruptedException e) {
        }
    }

    s_logger.debug("Unable to logon to " + ipAddress);

    return "Unable to connect";
}

From source file:HttpDownloadManager.java

public void run() {
    log.info("HttpDownloadManager thread starting.");

    // The download thread runs until release() is called
    while (!released) {
        // The thread blocks here waiting for something to happen
        try {/*  ww w .ja va2  s  .c o  m*/
            selector.select();
        } catch (IOException e) {
            // This should never happen.
            log.log(Level.SEVERE, "Error in select()", e);
            return;
        }

        // If release() was called, the thread should exit.
        if (released)
            break;

        // If any new Download objects are pending, deal with them first
        if (!pendingDownloads.isEmpty()) {
            // Although pendingDownloads is a synchronized list, we still
            // need to use a synchronized block to iterate through its
            // elements to prevent a concurrent call to download().
            synchronized (pendingDownloads) {
                Iterator iter = pendingDownloads.iterator();
                while (iter.hasNext()) {
                    // Get the pending download object from the list
                    DownloadImpl download = (DownloadImpl) iter.next();
                    iter.remove(); // And remove it.

                    // Now begin an asynchronous connection to the
                    // specified host and port. We don't block while
                    // waiting to connect.
                    SelectionKey key = null;
                    SocketChannel channel = null;
                    try {
                        // Open an unconnected channel
                        channel = SocketChannel.open();
                        // Put it in non-blocking mode
                        channel.configureBlocking(false);
                        // Register it with the selector, specifying that
                        // we want to know when it is ready to connect
                        // and when it is ready to read.
                        key = channel.register(selector, SelectionKey.OP_READ | SelectionKey.OP_CONNECT,
                                download);
                        // Create the web server address
                        SocketAddress address = new InetSocketAddress(download.host, download.port);
                        // Ask the channel to start connecting
                        // Note that we don't send the HTTP request yet.
                        // We'll do that when the connection completes.
                        channel.connect(address);
                    } catch (Exception e) {
                        handleError(download, channel, key, e);
                    }
                }
            }
        }

        // Now get the set of keys that are ready for connecting or reading
        Set keys = selector.selectedKeys();
        if (keys == null)
            continue; // bug workaround; should not be needed
        // Loop through the keys in the set
        for (Iterator i = keys.iterator(); i.hasNext();) {
            SelectionKey key = (SelectionKey) i.next();
            i.remove(); // Remove the key from the set before handling

            // Get the Download object we attached to the key
            DownloadImpl download = (DownloadImpl) key.attachment();
            // Get the channel associated with the key.
            SocketChannel channel = (SocketChannel) key.channel();

            try {
                if (key.isConnectable()) {
                    // If the channel is ready to connect, complete the
                    // connection and then send the HTTP GET request to it.
                    if (channel.finishConnect()) {
                        download.status = Status.CONNECTED;
                        // This is the HTTP request we wend
                        String request = "GET " + download.path + " HTTP/1.1\r\n" + "Host: " + download.host
                                + "\r\n" + "Connection: close\r\n" + "\r\n";
                        // Wrap in a CharBuffer and encode to a ByteBuffer
                        ByteBuffer requestBytes = LATIN1.encode(CharBuffer.wrap(request));
                        // Send the request to the server. If the bytes
                        // aren't all written in one call, we busy loop!
                        while (requestBytes.hasRemaining())
                            channel.write(requestBytes);

                        log.info("Sent HTTP request: " + download.host + ":" + download.port + ": " + request);
                    }
                }
                if (key.isReadable()) {
                    // If the key indicates that there is data to be read,
                    // then read it and store it in the Download object.
                    int numbytes = channel.read(buffer);

                    // If we read some bytes, store them, otherwise
                    // the download is complete and we need to note this
                    if (numbytes != -1) {
                        buffer.flip(); // Prepare to drain the buffer
                        download.addData(buffer); // Store the data
                        buffer.clear(); // Prepare for another read
                        log.info("Read " + numbytes + " bytes from " + download.host + ":" + download.port);
                    } else {
                        // If there are no more bytes to read
                        key.cancel(); // We're done with the key
                        channel.close(); // And with the channel.
                        download.status = Status.DONE;
                        if (download.listener != null) // notify listener
                            download.listener.done(download);
                        log.info("Download complete from " + download.host + ":" + download.port);
                    }
                }
            } catch (Exception e) {
                handleError(download, channel, key, e);
            }
        }
    }
    log.info("HttpDownloadManager thread exiting.");
}

From source file:com.byteatebit.nbserver.simple.client.SimpleNbClient.java

public void tcpConnect(String remoteHost, int remotePort, IClientSocketChannelHandler socketChannelHandler,
        long timeout) throws IOException {
    if (!initialized.get())
        throw new IllegalStateException("SimpleNbClient must first be initialized via init()");
    SocketChannel socketChannel = SocketChannel.open();
    socketChannel.configureBlocking(false);
    InetSocketAddress address = new InetSocketAddress(remoteHost, remotePort);
    INbContext nbContext = new NbContext(simpleNbService.getSelectorRegistrarBalancer().getSelectorRegistrar(),
            simpleNbService.getScheduler());
    IOTask connectTask = (selectionKey) -> {
        boolean connectionFinished = false;
        try {//  w  w w .  ja  va  2  s.  c  o m
            connectionFinished = socketChannel.finishConnect();
        } catch (IOException e) {
            LOG.error("Could not complete socket connection.", e);
        }
        if (!connectionFinished) {
            LOG.error("Could not complete socket connection.  Closing socket channel");
            selectionKey.cancel();
            IOUtils.closeQuietly(socketChannel);
            socketChannelHandler.connectFailed(remoteHost, remotePort);
            return;
        }
        selectionKey.interestOps(selectionKey.interestOps() & ~SelectionKey.OP_CONNECT);
        socketChannelHandler.accept(nbContext, socketChannel);
    };
    IOTimeoutTask timeoutTask = (selectionKey, ops) -> {
        LOG.error("Connect attempt timed out after " + timeout + " ms");
        selectionKey.cancel();
        IOUtils.closeQuietly(socketChannel);
        socketChannelHandler.connectFailed(remoteHost, remotePort);
    };
    nbContext.register(socketChannel, SelectionKey.OP_CONNECT, connectTask, timeoutTask, timeout);
    socketChannel.connect(address);
}

From source file:edu.hawaii.soest.kilonalu.ctd.CTDSource.java

/**
* A method used to the TCP socket of the remote source host for communication
* @param host       the name or IP address of the host to connect to for the
*                   socket connection (reading)
* @param portNumber the number of the TCP port to connect to (i.e. 2604)
*//*www .  j  ava2 s. co m*/
protected SocketChannel getSocketConnection() {

    String host = getHostName();
    int portNumber = new Integer(getHostPort()).intValue();
    SocketChannel dataSocket = null;

    try {

        // create the socket channel connection to the data source via the 
        // converter serial2IP converter      
        dataSocket = SocketChannel.open();
        dataSocket.connect(new InetSocketAddress(host, portNumber));

        // if the connection to the source fails, also disconnect from the RBNB
        // server and return null
        if (!dataSocket.isConnected()) {
            dataSocket.close();
            disconnect();
            dataSocket = null;
        }
    } catch (UnknownHostException ukhe) {

        logger.info("Unable to look up host: " + host + "\n");
        disconnect();
        dataSocket = null;
    } catch (IOException nioe) {
        logger.info("Couldn't get I/O connection to: " + host);
        disconnect();
        dataSocket = null;
    } catch (Exception e) {
        disconnect();
        dataSocket = null;
    }
    return dataSocket;

}

From source file:net.timewalker.ffmq4.transport.tcp.nio.NIOTcpPacketTransport.java

/**
  * Connect the transport to its remote endpoint
  *//*from w w  w  . j  ava 2s.  c o  m*/
private SocketChannel connect(URI transportURI) throws PacketTransportException {
    String host = transportURI.getHost();
    int port = transportURI.getPort();

    try {
        SocketChannel socketChannel = SocketChannel.open();
        socketChannel.configureBlocking(false);
        SocketUtils.setupSocket(socketChannel.socket(), socketSendBufferSize, socketRecvBufferSize);

        log.debug("#" + id + " opening a TCP connection to " + host + ":" + port);
        socketChannel.connect(new InetSocketAddress(host, port));

        return socketChannel;
    } catch (Exception e) {
        log.error("#" + id + " could not connect to " + host + ":" + port, e);
        throw new PacketTransportException("Could not connect to " + host + ":" + port + " : " + e.toString());
    }
}

From source file:net.ymate.platform.serv.nio.support.NioEventGroup.java

@SuppressWarnings("unchecked")
protected INioSession __doSessionCreate(IClientCfg cfg) throws IOException {
    SocketChannel _channel = SocketChannel.open();
    _channel.configureBlocking(false);/* w w  w.j  a va 2  s . c  o m*/
    _channel.socket().setReuseAddress(true);
    _channel.connect(new InetSocketAddress(cfg.getRemoteHost(), cfg.getPort()));
    __channel = _channel;
    return new NioSession(this, _channel);
}

From source file:org.apache.gobblin.tunnel.TestTunnelWithArbitraryTCPTraffic.java

@Test(enabled = false, timeOut = 15000)
public void testDirectConnectionToEchoServer() throws IOException {
    SocketChannel client = SocketChannel.open();
    try {/*from   ww  w .  ja va  2s . c o  m*/
        client.connect(new InetSocketAddress("localhost", doubleEchoServer.getServerSocketPort()));
        writeToSocket(client, "Knock\n".getBytes());
        String response = readFromSocket(client);
        client.close();
        assertEquals(response, "Knock Knock\n");
    } finally {
        client.close();
    }
}

From source file:org.apache.gobblin.tunnel.TestTunnelWithArbitraryTCPTraffic.java

@Test(enabled = false, timeOut = 15000)
public void testTunnelToEchoServer() throws IOException {
    MockServer proxyServer = startConnectProxyServer();
    Tunnel tunnel = Tunnel.build("localhost", doubleEchoServer.getServerSocketPort(), "localhost",
            proxyServer.getServerSocketPort());

    try {//from  w w w.ja  va 2 s . com
        int tunnelPort = tunnel.getPort();
        SocketChannel client = SocketChannel.open();

        client.connect(new InetSocketAddress("localhost", tunnelPort));
        client.write(ByteBuffer.wrap("Knock\n".getBytes()));
        String response = readFromSocket(client);
        client.close();

        assertEquals(response, "Knock Knock\n");
        assertEquals(proxyServer.getNumConnects(), 1);
    } finally {
        proxyServer.stopServer();
        tunnel.close();
        assertFalse(tunnel.isTunnelThreadAlive());
    }
}

From source file:org.apache.gobblin.tunnel.TestTunnelWithArbitraryTCPTraffic.java

@Test(enabled = false, timeOut = 15000)
public void testTunnelToDelayedEchoServer() throws IOException {
    MockServer proxyServer = startConnectProxyServer();
    Tunnel tunnel = Tunnel.build("localhost", delayedDoubleEchoServer.getServerSocketPort(), "localhost",
            proxyServer.getServerSocketPort());

    try {// w  ww.j a  v a  2 s .  c o m
        int tunnelPort = tunnel.getPort();
        SocketChannel client = SocketChannel.open();

        client.connect(new InetSocketAddress("localhost", tunnelPort));
        client.write(ByteBuffer.wrap("Knock\n".getBytes()));
        String response = readFromSocket(client);
        client.close();

        assertEquals(response, "Knock Knock\n");
        assertEquals(proxyServer.getNumConnects(), 1);
    } finally {
        proxyServer.stopServer();
        tunnel.close();
        assertFalse(tunnel.isTunnelThreadAlive());
    }
}