org.commoncrawl.io.internal.NIOServerTCPSocket.java Source code

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

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/**
 * Copyright 2008 - CommonCrawl Foundation
 * 
 * CommonCrawl licenses this file to you under the Apache License, 
 * Version 2.0 (the "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.commoncrawl.io.internal;

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;

public class NIOServerTCPSocket implements NIOServerSocket {

    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 int getSocketId() {
        return _socketId;
    }

    //@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);
    }

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

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

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

    //@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 (IOException e) {
                if (newClientChannel != null) {
                    try {
                        newClientChannel.close();
                    } catch (IOException e2) {
                        throw new RuntimeException(e2);
                    }
                }
                throw new RuntimeException(e);
            }
        }

    }

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