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MessageReceiver.java
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MessageReceiver.java
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/*
* Java Bittorrent API as its name indicates is a JAVA API that implements the Bittorrent Protocol
* This project contains two packages:
* 1. jBittorrentAPI is the "client" part, i.e. it implements all classes needed to publish
* files, share them and download them.
* This package also contains example classes on how a developer could create new applications.
* 2. trackerBT is the "tracker" part, i.e. it implements a all classes needed to run
* a Bittorrent tracker that coordinates peers exchanges. *
*
* Copyright (C) 2007 Baptiste Dubuis, Artificial Intelligence Laboratory, EPFL
*
* This file is part of jbittorrentapi-v1.0.zip
*
* Java Bittorrent API is free software and a free user study set-up;
* 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.
*
* Java Bittorrent API 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 Java Bittorrent API; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* @version 1.0
* @author Baptiste Dubuis
* To contact the author:
* email: baptiste.dubuis@gmail.com
*
* More information about Java Bittorrent API:
* http://sourceforge.net/projects/bitext/
*/
package jBittorrentAPI;
import java.io.*;
import javax.swing.event.EventListenerList;
/**
* Thread created to listen for incoming message from remote peers. When data is read,
* message type is determined and a new Message object (either Message_HS or Message_PP)
* is created and passed to the corresponding receiver
*/
public class MessageReceiver extends Thread {
private boolean run = true;
private InputStream is = null;
private DataInputStream dis = null;
private boolean hsOK = false;
private final EventListenerList listeners = new EventListenerList();
/**
* Create a new Message receiver for a given peer
* @param id The id of the peer that has been assigned this receiver
* @param is InputStream
* @throws IOException
*/
public MessageReceiver(String id, InputStream is) throws IOException {
//this.setName("MR_" + id);
this.is = is;
this.dis = new DataInputStream(is);
}
/**
* Reads bytes from the DataInputStream
* @param data byte[]
* @return int
*
*/
private int read(byte[] data){
try{
this.dis.readFully(data);
}catch(IOException ioe){
return -1;
}
return data.length;
}
/**
* Reads bytes from theInputStream
* @param data byte[]
* @return int
* @throws IOException
* @throws InterruptedException
* @deprecated
*/
private int read2(byte[] data)throws IOException, InterruptedException{
int totalread = 0;
int read = 0;
while(totalread != data.length){
if((read = this.is.read(data, totalread, data.length - totalread)) == -1)
return -1;
totalread += read;
this.sleep(50);
}
return totalread;
}
/**
* Reads bytes from the input stream. This read method read exactly the number of
* bytes corresponding to the length of the byte array given in parameter
* @param data byte[]
* @return int
* @throws IOException
* @throws InterruptedException
* @throws Exception
* @todo Optimize this method which seems to take too much time...
*/
private int read1(byte[] data) throws IOException, InterruptedException, Exception {
int l = data.length;
byte[] payload = new byte[0];
int loop = 0;
for (int i = 0; i < l; ) {
loop++;
int available = is.available();
if (available < l - i) {
loop++;
byte[] temp = new byte[available];
if (is.read(temp) == -1){
return -1;
}
payload = Utils.concat(payload, temp);
i += available;
this.sleep(10);
} else {
byte[] temp = new byte[l - i];
if (is.read(temp) == -1){
return -1;
}
payload = Utils.concat(payload, temp);
Utils.copy(payload, data);
return payload.length;
}
}
return -1;
}
/**
* Reads data from the inputstream, creates new messages according to the
* received data and fires MessageReceived method of the listeners with the
* new message in parameter. Loops as long as the 'run' variable is true
*/
public void run() {
//Message m = null;
int read = 0;
byte[] lengthHS = new byte[1];
byte[] protocol = new byte[19];
byte[] reserved = new byte[8];
byte[] fileID = new byte[20];
byte[] peerID = new byte[20];
byte[] length = new byte[4];
Message_HS hs = new Message_HS();
Message_PP mess = new Message_PP();
while (this.run) {
int l = 1664;
try {
if (!hsOK) {
//System.out.println("Wait for hs");
if ((read = this.read(lengthHS)) > 0) {
for (int i = 0; i < 19; i++)
protocol[i] = (byte) is.read();
for (int i = 0; i < 8; i++)
reserved[i] = (byte) is.read();
for (int i = 0; i < 20; i++)
fileID[i] = (byte) is.read();
for (int i = 0; i < 20; i++)
peerID[i] = (byte) is.read();
hs.setData(lengthHS, protocol, reserved,
fileID, peerID);
//this.hsOK = true;
} else {
hs = null;
}
} else {
int id;
if ((read = this.read(length)) > 0) {
l = Utils.byteArrayToInt(length);
if (l == 0) {
mess.setData(PeerProtocol.KEEP_ALIVE);
} else {
id = is.read();
if(id == -1){
System.err.println("id");
mess = null;
}else{
if (l == 1)
mess.setData(id + 1);
else {
l = l - 1;
byte[] payload = new byte[l];
if (this.read(payload) > 0)
mess.setData(id + 1, payload);
payload = null;
}
}
}
} else {
mess = null;
}
}
} catch (IOException ioe) {
ioe.printStackTrace();
this.fireMessageReceived(null);
return;
// m = null;
} /*catch (InterruptedException ie) {
this.fireMessageReceived(null);
return;
// m = null;
} */catch (Exception e) {
System.err.println(l+"Error in MessageReceiver..."+e.getMessage()
+" " + e.toString());
this.fireMessageReceived(null);
return;
// m = null;
}
if(!this.hsOK){
this.fireMessageReceived(hs);
this.hsOK = true;
}else{
this.fireMessageReceived(mess);
}
// m = null;
}
try{
this.dis.close();
this.dis = null;
}catch(Exception e){}
}
public void addIncomingListener(IncomingListener listener) {
listeners.add(IncomingListener.class, listener);
}
public void removeIncomingListener(IncomingListener listener) {
listeners.remove(IncomingListener.class, listener);
}
public IncomingListener[] getIncomingListeners() {
return listeners.getListeners(IncomingListener.class);
}
protected void fireMessageReceived(Message m) {
for (IncomingListener listener : getIncomingListeners()) {
listener.messageReceived(m);
}
}
/**
* Stops the current thread by completing the run() method
*/
public void stopThread(){
this.run = false;
}
}