org.commoncrawl.io.NIOServerTCPSocket.java Source code

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Here is the source code for org.commoncrawl.io.NIOServerTCPSocket.java

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/**
 * Copyright 2008 - CommonCrawl Foundation
 * 
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation, either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 **/
package org.commoncrawl.io;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.nio.channels.spi.AbstractSelectableChannel;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.commoncrawl.util.CCStringUtils;

/**
 * 
 * @author rana
 *
 */
public class NIOServerTCPSocket implements NIOServerSocket {

    private static void setClientSocketOptions(SocketChannel channel) throws IOException {
        channel.socket().setTcpNoDelay(true);
        channel.configureBlocking(false);
    }

    private static void setListenerSocketOptions(ServerSocketChannel channel) throws IOException {
        channel.socket().setReuseAddress(true);
        channel.configureBlocking(false);
    }

    int _socketId = NIOSocket._idFactory.getNextId();

    ServerSocketChannel _channel;

    NIOServerSocketListener _listener;

    public static final Log LOG = LogFactory.getLog(NIOServerTCPSocket.class);

    public NIOServerTCPSocket(NIOServerSocketListener listener) {

        _listener = listener;
    }

    // @Override
    public void acceptable() {
        if (_listener != null) {

            SocketChannel newClientChannel = null;
            try {
                newClientChannel = _channel.accept();
                // set socket options
                setClientSocketOptions(newClientChannel);
                // allocate a new NIOClientTCPSocket object ...
                NIOClientTCPSocket newSocketObj = new NIOClientTCPSocket(newClientChannel);
                // inform the listener of the event
                _listener.Accepted(newSocketObj);
            } catch (Exception e) {
                LOG.error("ERROR: ACCEPTING CONNECTION On Server Socket:" + _channel.toString() + " Exception:"
                        + CCStringUtils.stringifyException(e));
                if (newClientChannel != null) {
                    try {
                        newClientChannel.close();
                    } catch (IOException e2) {
                        LOG.error(CCStringUtils.stringifyException(e));
                    }
                }
                throw new RuntimeException(e);
            }
        }

    }

    // @Override
    public void close() {
        try {
            if (_channel != null) {
                if (_channel.socket() != null)
                    _channel.socket().close();
                _channel.close();
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        } finally {
            _channel = null;
        }
    }

    // @Override
    public AbstractSelectableChannel getChannel() {
        return _channel;
    }

    // @Override
    public NIOSocketListener getListener() {
        return _listener;
    }

    // @Override
    public int getSocketId() {
        return _socketId;
    }

    // @Override
    public boolean isOpen() {
        return _channel != null;
    }

    // @Override
    public void open(InetSocketAddress address) throws IOException {
        if (_channel != null) {
            throw new IOException("Invalid State. Socket already bound");
        }
        LOG.info(this + " Binding to: " + address.getAddress().getHostAddress() + ":" + address.getPort());
        _channel = ServerSocketChannel.open();
        setListenerSocketOptions(_channel);
        _channel.socket().bind(address);
    }

    // @Override
    public void setListener(NIOSocketListener listener) {
        _listener = (NIOServerSocketListener) listener;
    }
}