SocketChannel connect to the passed host and port. - Java java.nio.channels

Java examples for java.nio.channels:SocketChannel

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Description

SocketChannel connect to the passed host and port.

Demo Code

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//package com.java2s;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.channels.SocketChannel;

public class Main {
    /**
     * This will attempt to connect to the passed host and port. The connection
     * will be made in non-blocking mode, so if there is no route to the host,
     * then it won't hold up capsd or the poller.
     *
     * Once a connection is made, the channel is returned to blocking mode.
     *
     * @param host
     *            remote host
     * @param port
     *            port
     * @param timeout
     *            timeout (ms)
     * @return SocketChannel object already connected to the remote host/port
     *         pair.
     * @throws java.io.IOException if any.
     * @throws java.lang.InterruptedException if any.
     */
    public static SocketChannel getConnectedSocketChannel(InetAddress host,
            int port, int timeout) throws IOException, InterruptedException {
        SocketChannel sChannel = null;

        try {
            // try to connect first as non-blocking
            sChannel = SocketChannel.open();
            sChannel.configureBlocking(false);
            sChannel.connect(new InetSocketAddress(host, port));
            long startConnectTime = System.currentTimeMillis();

            // see if connected
            do {
                if (!sChannel.finishConnect()) {
                    Thread.sleep(100);
                }
            } while (!sChannel.isConnected()
                    && (System.currentTimeMillis() - startConnectTime) <= timeout);

            // check timeout
            if (!sChannel.isConnected()) {
                if (sChannel.socket() != null)
                    sChannel.socket().close();

                sChannel.close();
                sChannel = null;
            } else {
                // we're connected, so return channel to blocking mode. Avoids
                // No Route to Host errors.
                sChannel.configureBlocking(true);
                sChannel.socket().setSoTimeout(timeout);
            }
        } catch (IOException e) {
            if (sChannel != null) {
                if (sChannel.socket() != null)
                    sChannel.socket().close();
                sChannel.close();
                sChannel = null;
            }
            throw e;
        } catch (InterruptedException e) {
            if (sChannel != null) {
                if (sChannel.socket() != null)
                    sChannel.socket().close();
                sChannel.close();
                sChannel = null;
            }
            throw e;
        }

        return sChannel;
    }
}

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