OioSocketChannel.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.channel.socket.DefaultSocketChannelConfig;
import org.jboss.netty.channel.socket.SocketChannel;
import org.jboss.netty.channel.socket.SocketChannelConfig;

import java.io.OutputStream;
import java.io.PushbackInputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;

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

    final Socket socket;
    final Object interestOpsLock = new Object();
    private final SocketChannelConfig config;
    volatile Thread workerThread;
    private volatile InetSocketAddress localAddress;
    private volatile InetSocketAddress remoteAddress;

    OioSocketChannel(
            Channel parent,
            ChannelFactory factory,
            ChannelPipeline pipeline,
            ChannelSink sink,
            Socket socket) {

        super(parent, factory, pipeline, sink);

        this.socket = socket;
        config = new DefaultSocketChannelConfig(socket);
    }

    public SocketChannelConfig getConfig() {
        return config;
    }

    public InetSocketAddress getLocalAddress() {
        InetSocketAddress localAddress = this.localAddress;
        if (localAddress == null) {
            try {
                this.localAddress = localAddress =
                    (InetSocketAddress) socket.getLocalSocketAddress();
            } catch (Throwable t) {
                // Sometimes fails on a closed socket in Windows.
                return null;
            }
        }
        return localAddress;
    }

    public InetSocketAddress getRemoteAddress() {
        InetSocketAddress remoteAddress = this.remoteAddress;
        if (remoteAddress == null) {
            try {
                this.remoteAddress = remoteAddress =
                    (InetSocketAddress) socket.getRemoteSocketAddress();
            } catch (Throwable t) {
                // Sometimes fails on a closed socket in Windows.
                return null;
            }
        }
        return remoteAddress;
    }

    public boolean isBound() {
        return isOpen() && socket.isBound();
    }

    public boolean isConnected() {
        return isOpen() && socket.isConnected();
    }

    @Override
    protected boolean setClosed() {
        return super.setClosed();
    }

    @Override
    protected void setInterestOpsNow(int interestOps) {
        super.setInterestOpsNow(interestOps);
    }

    abstract PushbackInputStream getInputStream();
    abstract OutputStream getOutputStream();

    @Override
    public ChannelFuture write(Object message, SocketAddress remoteAddress) {
        if (remoteAddress == null || remoteAddress.equals(getRemoteAddress())) {
            return super.write(message, null);
        } else {
            return getUnsupportedOperationFuture();
        }
    }
}