SocketIOIOConnection.java

/*
 * Copyright 2011 Ytai Ben-Tsvi. All rights reserved.
 *
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list
 *       of conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ARSHAN POURSOHI OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are those of the
 * authors and should not be interpreted as representing official policies, either expressed
 * or implied.
 */
package ioio.lib.impl;

import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;

import ioio.lib.api.IOIOConnection;
import ioio.lib.api.exception.ConnectionLostException;
import ioio.lib.spi.Log;

public class SocketIOIOConnection implements IOIOConnection {
    private static final String TAG = "SocketIOIOConnection";
    private final int port_;
    private ServerSocket server_ = null;
    private Socket socket_ = null;
    private boolean disconnect_ = false;
    private boolean server_owned_by_connect_ = true;
    private boolean socket_owned_by_connect_ = true;
    private InputStream inputStream_;
    private OutputStream outputStream_;

    public SocketIOIOConnection(int port) {
        port_ = port;
    }

    @Override
    public void waitForConnect() throws ConnectionLostException {
        try {
            synchronized (this) {
                if (disconnect_) {
                    throw new ConnectionLostException();
                }
                Log.v(TAG, "Creating server socket");
                server_ = new ServerSocket(port_);
                server_owned_by_connect_ = false;
            }
            Log.v(TAG, "Waiting for TCP connection");
            socket_ = server_.accept();
            Log.v(TAG, "TCP connected");
            inputStream_ = new FixedReadBufferedInputStream(socket_.getInputStream(), 64);
            outputStream_ = new BufferedOutputStream(socket_.getOutputStream(), 1024);
            synchronized (this) {
                if (disconnect_) {
                    socket_.close();
                    throw new ConnectionLostException();
                }
                socket_owned_by_connect_ = false;
            }
        } catch (IOException e) {
            synchronized (this) {
                disconnect_ = true;
                if (server_owned_by_connect_ && server_ != null) {
                    try {
                        server_.close();
                    } catch (IOException e1) {
                        Log.e(TAG, "Unexpected exception", e1);
                    }
                }
                if (socket_owned_by_connect_ && socket_ != null) {
                    try {
                        socket_.close();
                    } catch (IOException e1) {
                        Log.e(TAG, "Unexpected exception", e1);
                    }
                }
                if (e instanceof SocketException && e.getMessage().equals("Permission denied")) {
                    Log.e(TAG, "Did you forget to declare uses-permission of android.permission.INTERNET?");
                }
                throw new ConnectionLostException(e);
            }
        }
    }

    @Override
    synchronized public void disconnect() {
        if (disconnect_) {
            return;
        }
        Log.v(TAG, "Client initiated disconnect");
        disconnect_ = true;
        if (!server_owned_by_connect_) {
            try {
                server_.close();
            } catch (IOException e1) {
                Log.e(TAG, "Unexpected exception", e1);
            }
        }
        if (!socket_owned_by_connect_) {
            try {
                socket_.shutdownOutput();
            } catch (IOException e1) {
            }
        }
    }

    @Override
    public InputStream getInputStream() throws ConnectionLostException {
        return inputStream_;
    }

    @Override
    public OutputStream getOutputStream() throws ConnectionLostException {
        return outputStream_;
    }

    @Override
    public boolean canClose() {
        return true;
    }
}