org.jboss.netty.channel.socket.oio.OioWorker Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of netty Show documentation

The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

There is a newer version: 4.0.0.Alpha8

Show newest version

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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.jboss.netty.channel.socket.oio;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.DefaultFileRegion;
import org.jboss.netty.channel.FileRegion;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PushbackInputStream;
import java.net.SocketException;
import java.nio.channels.Channels;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.WritableByteChannel;
import java.util.regex.Pattern;

import static org.jboss.netty.channel.Channels.*;

class OioWorker extends AbstractOioWorker {

    private static final Pattern SOCKET_CLOSED_MESSAGE = Pattern.compile(
            "^.*(?:Socket.*closed).*$", Pattern.CASE_INSENSITIVE);

    OioWorker(OioSocketChannel channel) {
        super(channel);
    }

    @Override
    public void run() {
        boolean fireConnected = channel instanceof OioAcceptedSocketChannel;
        if (fireConnected && channel.isOpen()) {
            // Fire the channelConnected event for OioAcceptedSocketChannel.
            // See #287
            fireChannelConnected(channel, channel.getRemoteAddress());
        }
        super.run();
    }

    @Override
    boolean process() throws IOException {
        byte[] buf;
        int readBytes;
        PushbackInputStream in = channel.getInputStream();
        int bytesToRead = in.available();
        if (bytesToRead > 0) {
            buf = new byte[bytesToRead];
            readBytes = in.read(buf);
        } else {
            int b = in.read();
            if (b < 0) {
                return false;
            }
            in.unread(b);
            return true;
        }
        fireMessageReceived(channel, channel.getConfig().getBufferFactory().getBuffer(buf, 0, readBytes));

        return true;
    }

    static void write(
            OioSocketChannel channel, ChannelFuture future,
            Object message) {

        boolean iothread = isIoThread(channel);
        OutputStream out = channel.getOutputStream();
        if (out == null) {
            Exception e = new ClosedChannelException();
            future.setFailure(e);
            if (iothread) {
                fireExceptionCaught(channel, e);
            } else {
                fireExceptionCaughtLater(channel, e);
            }
            return;
        }

        try {
            int length = 0;

            // Add support to write a FileRegion. This in fact will not give any performance gain
            // but at least it not fail and we did the best to emulate it
            if (message instanceof FileRegion) {
                FileRegion fr = (FileRegion) message;
                try {
                    synchronized (out) {
                        WritableByteChannel  bchannel = Channels.newChannel(out);

                        long i;
                        while ((i = fr.transferTo(bchannel, length)) > 0) {
                            length += i;
                            if (length >= fr.getCount()) {
                                break;
                            }
                        }
                    }
                } finally {
                    if (fr instanceof DefaultFileRegion) {
                        DefaultFileRegion dfr = (DefaultFileRegion) fr;
                        if (dfr.releaseAfterTransfer()) {
                            fr.releaseExternalResources();
                        }
                    }
                }
            } else {
                ChannelBuffer a = (ChannelBuffer) message;
                length = a.readableBytes();
                synchronized (out) {
                    a.getBytes(a.readerIndex(), out, length);
                }
            }

            future.setSuccess();
            if (iothread) {
                fireWriteComplete(channel, length);
            } else {
                fireWriteCompleteLater(channel, length);
            }

        } catch (Throwable t) {
            // Convert 'SocketException: Socket closed' to
            // ClosedChannelException.
            if (t instanceof SocketException &&
                    SOCKET_CLOSED_MESSAGE.matcher(
                            String.valueOf(t.getMessage())).matches()) {
                t = new ClosedChannelException();
            }
            future.setFailure(t);
            if (iothread) {
                fireExceptionCaught(channel, t);
            } else {
                fireExceptionCaughtLater(channel, t);
            }
        }
    }
}