OioClientSocketPipelineSink.java

/*
 * Copyright 2012-2015, the original author or authors.
 *
 * Licensed 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 com.flipkart.phantom.netty.uds;

import org.jboss.netty.channel.*;
import org.jboss.netty.util.ThreadRenamingRunnable;
import org.jboss.netty.util.internal.DeadLockProofWorker;

import java.io.PushbackInputStream;
import java.net.SocketAddress;
import java.util.concurrent.Executor;

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

/**
 * Based on: org.jboss.netty.channel.socket.oio.OioClientSocketPipelineSink
 * OIO package modified to work for Unix Domain Sockets instead of ServerSocket.
 * 
 * @author devashishshankar
 * @version 1.0, 19th April 2013
 */
class OioClientSocketPipelineSink extends AbstractChannelSink {

    private final Executor workerExecutor;

    OioClientSocketPipelineSink(Executor workerExecutor) {
        this.workerExecutor = workerExecutor;
    }

    public void eventSunk(
            ChannelPipeline pipeline, ChannelEvent e) throws Exception {
        OioClientSocketChannel channel = (OioClientSocketChannel) e.getChannel();
        ChannelFuture future = e.getFuture();
        if (e instanceof ChannelStateEvent) {
            ChannelStateEvent stateEvent = (ChannelStateEvent) e;
            ChannelState state = stateEvent.getState();
            Object value = stateEvent.getValue();
            switch (state) {
            case OPEN:
                if (Boolean.FALSE.equals(value)) {
                    OioWorker.close(channel, future);
                }
                break;
            case BOUND:
                if (value != null) {
                    bind(channel, future, (SocketAddress) value);
                } else {
                    OioWorker.close(channel, future);
                }
                break;
            case CONNECTED:
                if (value != null) {
                    connect(channel, future, (SocketAddress) value);
                } else {
                    OioWorker.close(channel, future);
                }
                break;
            case INTEREST_OPS:
                OioWorker.setInterestOps(channel, future, ((Integer) value).intValue());
                break;
            }
        } else if (e instanceof MessageEvent) {
            OioWorker.write(
                    channel, future,
                    ((MessageEvent) e).getMessage());
        }
    }

    private void bind(
            OioClientSocketChannel channel, ChannelFuture future,
            SocketAddress localAddress) {
        try {
            channel.socket.bind(localAddress);
            future.setSuccess();
            fireChannelBound(channel, channel.getLocalAddress());
        } catch (Throwable t) {
            future.setFailure(t);
            fireExceptionCaught(channel, t);
        }
    }

    private void connect(
            OioClientSocketChannel channel, ChannelFuture future,
            SocketAddress remoteAddress) {

        boolean bound = channel.isBound();
        boolean connected = false;
        boolean workerStarted = false;

        future.addListener(ChannelFutureListener.CLOSE_ON_FAILURE);

        try {
            channel.socket.connect(
                    remoteAddress, channel.getConfig().getConnectTimeoutMillis());
            connected = true;

            // Obtain I/O stream.
            channel.in = new PushbackInputStream(channel.socket.getInputStream(), 1);
            channel.out = channel.socket.getOutputStream();

            // Fire events.
            future.setSuccess();
            if (!bound) {
                fireChannelBound(channel, channel.getLocalAddress());
            }
            fireChannelConnected(channel, channel.getRemoteAddress());

            // Start the business.
            DeadLockProofWorker.start(
                    workerExecutor,
                    new ThreadRenamingRunnable(
                            new OioWorker(channel),
                            "Old I/O client worker (" + channel + ')'));
            workerStarted = true;
        } catch (Throwable t) {
            future.setFailure(t);
            fireExceptionCaught(channel, t);
        } finally {
            if (connected && !workerStarted) {
                OioWorker.close(channel, future);
            }
        }
    }
}