DMDirc-Client/src/com/dmdirc/addons/identd/IdentdServer.java

/*
 * Copyright (c) 2006-2008 Chris Smith, Shane Mc Cormack, Gregory Holmes
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.dmdirc.addons.identd;

import com.dmdirc.config.IdentityManager;
import com.dmdirc.logger.Logger;
import com.dmdirc.logger.ErrorLevel;

import java.net.Socket;
import java.net.ServerSocket;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * The IdentdServer watches over the ident port when required
 *
 * @author Shane "Dataforce" Mc Cormack
 * @version $Id: IdentdServer.java 969 2007-04-30 18:38:20Z ShaneMcC $
 */
public final class IdentdServer implements Runnable {

    /** The Thread in use for this server */
	private volatile Thread myThread = null;
	/** The current socket in use for this server */
	private ServerSocket serverSocket;
	/** Arraylist of all the clients we have */
	private final List<IdentClient> clientList = new ArrayList<IdentClient>();
	
	/**
	 * Create the IdentdServer.
	 */
	public IdentdServer() {
        super();
	}
	
	/**
	 * Run this IdentdServer.
	 */
	public void run() {
		final Thread thisThread = Thread.currentThread();
		while (myThread == thisThread) {
			try {
				final Socket clientSocket = serverSocket.accept();
				final IdentClient client = new IdentClient(this, clientSocket);
				addClient(client);
			} catch (IOException e) {
				if (myThread == thisThread) {
					Logger.userError(ErrorLevel.HIGH ,"Accepting client failed: "+e.getMessage());
				}
			}
		}
	}
	
	/**
	 * Add an IdentClient to the clientList
	 *
	 * @param client Client to add
	 */
	public void addClient(final IdentClient client) {
		synchronized (clientList) {
			clientList.add(client);
		}
	}
	
	/**
	 * Remove an IdentClient from the clientList
	 *
	 * @param client Client to remove
	 */
	public void delClient(final IdentClient client) {
		synchronized (clientList) {
			for (int i = 0; i < clientList.size() ; ++i) {
				if (clientList.get(i) == client) {
					clientList.remove(i);
					break;
				}
			}
		}
	}
	
	/**
	 * Check if the server is currently running
	 *
	 * @return True if the server is running
	 */
	public boolean isRunning() {
		return (myThread != null);
	}
	
	/**
	 * Start the ident server
	 */
	public void startServer() {
		if (myThread == null) {
			try {
				final int identPort = IdentityManager.getGlobalConfig().getOptionInt(IdentdPlugin.getDomain(), "advanced.port", 113);
				serverSocket = new ServerSocket(identPort);
				myThread = new Thread(this);
				myThread.start();
			} catch (IOException e) {
				Logger.userError(ErrorLevel.MEDIUM ,"Unable to start identd server: "+e.getMessage());
			}
		}
	}
	
	/**
	 * Stop the ident server
	 */
	public void stopServer() {
		if (myThread != null) {
			final Thread tmpThread = myThread;
			myThread = null;
			if (tmpThread != null) { tmpThread.interrupt(); }
			try { serverSocket.close(); } catch (IOException e) { }
			
			synchronized (clientList) {
				for (int i = 0; i < clientList.size() ; ++i) {
					clientList.get(i).close();
				}
				clientList.clear();
			}
		}
	}
	
}