/*
* Copyright (C) 2005 Luca Veltri - University of Parma - Italy
*
* 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
{
private boolean initialized=false;
/** The reading buffer size */
protected 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 */
protected TcpSocket socket;
/** Maximum time that the connection can remain active after been halted (in milliseconds) */
protected int socket_timeout;
/** Maximum time that the connection remains active without receiving data (in milliseconds) */
protected long alive_time;
/** The InputStream */
protected InputStream istream;
/** The OutputStream */
protected OutputStream ostream;
/** InputStream/OutputStream error */
protected Exception error;
/** Whether it has been halted */
protected boolean stop;
/** Whether it is running */
protected boolean is_running;
/** TcpConnection listener */
protected 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)
{
if (!initialized){
initialized=true;
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);
// 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:"+socket.getLocalAddress()+":"+socket.getLocalPort()+"<->"+socket.getAddress()+":"+socket.getPort();
}
}