package org.jibble.pircbot;
import java.io.*;
import java.net.*;
import java.util.*;
/**
* A Thread which reads lines from the IRC server. It then
* passes these lines to the PircBot without changing them.
* This running Thread also detects disconnection from the server
* and is thus used by the OutputThread to send lines to the server.
*
* @author PircBot-PPF project
* @version 1.0.0
*/
public class InputThread extends Thread {
/**
* The InputThread reads lines from the IRC server and allows the
* PircBot to handle them.
*
* @param bot An instance of the underlying PircBot.
* @param socket
* @param breader The BufferedReader that reads lines from the server.
* @param bwriter The BufferedWriter that sends lines to the server.
*/
InputThread(PircBot bot, Socket socket, BufferedReader breader, BufferedWriter bwriter) {
_bot = bot;
_socket = socket;
_breader = breader;
_bwriter = bwriter;
this.setName(this.getClass() + "-Thread");
}
/**
* Sends a raw line to the IRC server as soon as possible, bypassing the
* outgoing message queue.
*
* @param line The raw line to send to the IRC server.
*/
void sendRawLine(String line) {
OutputThread.sendRawLine(_bot, _bwriter, line);
}
/**
* Returns true if this InputThread is connected to an IRC server.
* The result of this method should only act as a rough guide,
* as the result may not be valid by the time you act upon it.
*
* @return True if still connected.
*/
boolean isConnected() {
return _isConnected;
}
/**
* Called to start this Thread reading lines from the IRC server.
* When a line is read, this method calls the handleLine method
* in the PircBot, which may subsequently call an 'onXxx' method
* in the PircBot subclass. If any subclass of Throwable (i.e.
* any Exception or Error) is thrown by your method, then this
* method will print the stack trace to the standard output. It
* is probable that the PircBot may still be functioning normally
* after such a problem, but the existance of any uncaught exceptions
* in your code is something you should really fix.
*/
public void run() {
try {
boolean running = true;
while (running) {
try {
String line = null;
while ((line = _breader.readLine()) != null) {
try {
_bot.handleLine(line);
}
catch (Throwable t) {
// Stick the whole stack trace into a String so we can output it nicely.
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
t.printStackTrace(pw);
pw.flush();
StringTokenizer tokenizer = new StringTokenizer(sw.toString(), "\r\n");
synchronized (_bot) {
_bot.log("### Your implementation of PircBot is faulty and you have");
_bot.log("### allowed an uncaught Exception or Error to propagate in your");
_bot.log("### code. It may be possible for PircBot to continue operating");
_bot.log("### normally. Here is the stack trace that was produced: -");
_bot.log("### ");
while (tokenizer.hasMoreTokens()) {
_bot.log("### " + tokenizer.nextToken());
}
}
}
}
if (line == null) {
// The server must have disconnected us.
running = false;
}
}
catch (InterruptedIOException iioe) {
// This will happen if we haven't received anything from the server for a while.
// So we shall send it a ping to check that we are still connected.
this.sendRawLine("PING " + (System.currentTimeMillis() / 1000));
// Now we go back to listening for stuff from the server...
}
}
}
catch (Exception e) {
// Do nothing.
}
// If we reach this point, then we must have disconnected.
try {
_socket.close();
}
catch (Exception e) {
// Just assume the socket was already closed.
}
if (!_disposed) {
_bot.log("*** Disconnected.");
_isConnected = false;
_bot.onDisconnect();
}
}
/**
* Closes the socket without onDisconnect being called subsequently.
*/
public void dispose () {
try {
_disposed = true;
_socket.close();
}
catch (Exception e) {
// Do nothing.
}
}
void quitServer() {
_isConnected = false;
}
private PircBot _bot = null;
private Socket _socket = null;
private BufferedReader _breader = null;
private BufferedWriter _bwriter = null;
private boolean _isConnected = true;
private boolean _disposed = false;
public static final int MAX_LINE_LENGTH = 512;
}