TcpConnection.java :  » VOIP » aethervoice » org » zoolu » net » Android Open Source

/*
 * Copyright (C) 2005 Luca Veltri - University of Parma - Italy
 * Copyright (C) 2009 The Sipdroid Open Source Project
 * 
 * This file is part of MjSip (http://www.mjsip.org)
 * 
 * MjSip is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * MjSip is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with MjSip; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Author(s):
 * Luca Veltri (luca.veltri@unipr.it)
 */

package org.zoolu.net;

// import java.net.InetAddress;
import java.io.*;

/**
 * TcpConnection provides a TCP connection oriented transport service.
 */
public class TcpConnection extends Thread {
  /** The reading buffer size */
  static final int BUFFER_SIZE = 65535;

  /**
   * Default value for the maximum time that the tcp connection can remain
   * active after been halted (in milliseconds)
   */
  public static final int DEFAULT_SOCKET_TIMEOUT = 2000; // 2sec

  /** The TCP socket */
  TcpSocket socket;

  /**
   * Maximum time that the connection can remain active after been halted (in
   * milliseconds)
   */
  int socket_timeout;

  /**
   * Maximum time that the connection remains active without receiving data
   * (in milliseconds)
   */
  long alive_time;

  /** The InputStream */
  InputStream istream;

  /** The OutputStream */
  OutputStream ostream;

  /** InputStream/OutputStream error */
  Exception error;

  /** Whether it has been halted */
  boolean stop;

  /** Whether it is running */
  boolean is_running;

  /** TcpConnection listener */
  TcpConnectionListener listener;

  /** Costructs a new TcpConnection */
  public TcpConnection(TcpSocket socket, TcpConnectionListener listener) {
    init(socket, 0, listener);
    start();
  }

  /** Costructs a new TcpConnection */
  public TcpConnection(TcpSocket socket, long alive_time,
      TcpConnectionListener listener) {
    init(socket, alive_time, listener);
    start();
  }

  /** Inits the TcpConnection */
  private void init(TcpSocket socket, long alive_time,
      TcpConnectionListener listener) {
    this.listener = listener;
    this.socket = socket;
    this.socket_timeout = DEFAULT_SOCKET_TIMEOUT;
    this.alive_time = alive_time;
    this.stop = false;
    this.is_running = true;

    this.istream = null;
    this.ostream = null;
    this.error = null;
    try {
      istream = new BufferedInputStream(socket.getInputStream());
      ostream = new BufferedOutputStream(socket.getOutputStream());
    } catch (Exception e) {
      error = e;
    }
  }

  /** Whether the service is running */
  public boolean isRunning() {
    return is_running;
  }

  /** Gets the TcpSocket */
  public TcpSocket getSocket() {
    return socket;
  }

  /** Gets the remote IP address */
  public IpAddress getRemoteAddress() {
    return socket.getAddress();
  }

  /** Gets the remote port */
  public int getRemotePort() {
    return socket.getPort();
  }

  /** Stops running */
  public void halt() {
    stop = true;
  }

  /** Sends data */
  public void send(byte[] buff, int offset, int len) throws IOException {
    if (!stop && ostream != null) {
      ostream.write(buff, offset, len);
      ostream.flush();
    }
  }

  /** Sends data */
  public void send(byte[] buff) throws IOException {
    send(buff, 0, buff.length);
  }

  /** Runs the tcp receiver */
  public void run() {
    byte[] buff = new byte[BUFFER_SIZE];
    long expire = 0;
    if (alive_time > 0)
      expire = System.currentTimeMillis() + alive_time;
    try {
      if (error != null)
        throw error;
//      socket.setSoTimeout(socket_timeout); modified
      // loop
      while (!stop) {
        int len = 0;
        if (istream != null) {
          try {
            len = istream.read(buff);
          } catch (InterruptedIOException ie) {
            if (alive_time > 0
                && System.currentTimeMillis() > expire)
              halt();
            continue;
          }
        }
        if (len < 0) { // error=new Exception("TCP connection closed");
          stop = true;
        } else if (len > 0) {
          if (listener != null)
            listener.onReceivedData(this, buff, len);
          if (alive_time > 0)
            expire = System.currentTimeMillis() + alive_time;
        }
      }
    } catch (Exception e) {
      error = e;
      stop = true;
    }
    is_running = false;
    if (istream != null)
      try {
        istream.close();
      } catch (Exception e) {
      }
    if (ostream != null)
      try {
        ostream.close();
      } catch (Exception e) {
      }
    if (listener != null)
      listener.onConnectionTerminated(this, error);
    listener = null;
  }

  /** Gets a String representation of the Object */
  public String toString() {
    return "tcp:" // modified + socket.getLocalAddress() + ":" + socket.getLocalPort()
//        + "<->" + socket.getAddress() + ":" + socket.getPort();
    ;
  }

}