/**
* Copyright (C) 2002-2012 The FreeCol Team
*
* This file is part of FreeCol.
*
* FreeCol 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.
*
* FreeCol 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 FreeCol. If not, see <http://www.gnu.org/licenses/>.
*/
package net.sf.freecol.metaserver;
import java.io.IOException;
import java.util.logging.Logger;
import net.sf.freecol.common.networking.Connection;
import net.sf.freecol.common.networking.DOMMessage;
import net.sf.freecol.common.networking.MessageHandler;
import org.w3c.dom.Element;
/**
* Handles all network messages beeing sent to the metaserver.
*/
public final class NetworkHandler implements MessageHandler {
private static Logger logger = Logger.getLogger(NetworkHandler.class.getName());
private MetaServer metaServer;
private MetaRegister metaRegister;
/**
* The constructor to use.
*
* @param metaServer The <code>MetaServer</code> this
* <code>NetworkHandler</code> has been created
* for.
* @param metaRegister An object containing a list
* of all the servers.
*/
public NetworkHandler(MetaServer metaServer, MetaRegister metaRegister) {
this.metaServer = metaServer;
this.metaRegister = metaRegister;
}
/**
* Handles a network message.
*
* @param connection The <code>Connection</code> the message came from.
* @param element The message to be processed.
*/
public synchronized Element handle(Connection connection, Element element) {
Element reply = null;
String type = element.getTagName();
if (type.equals("register")) {
reply = register(connection, element);
} else if (type.equals("update")) {
reply = update(connection, element);
} else if (type.equals("getServerList")) {
reply = getServerList(connection, element);
} else if (type.equals("remove")) {
reply = remove(connection, element);
} else if (type.equals("disconnect")) {
reply = disconnect(connection, element);
} else {
logger.warning("Unkown request: " + type);
}
return reply;
}
/**
* Handles a "getServerList"-request.
* @param connection The <code>Connection</code> the message
* was received on.
* @param element The element containing the request.
* @return The reply: An <code>Element</code> with a list of the
* servers in the {@link MetaRegister}.
*/
private Element getServerList(Connection connection, Element element) {
return metaRegister.createServerList();
}
/**
* Handles a "register"-request.
*
* @param connection The connection the message was received on.
* @param element The element containing the request.
* @return The reply: <code>null</code>.
*/
private Element register(Connection connection, Element element) {
String name = element.getAttribute("name");
String address = connection.getSocket().getInetAddress().getHostAddress();
int port = Integer.parseInt(element.getAttribute("port"));
int slotsAvailable = Integer.parseInt(element.getAttribute("slotsAvailable"));
int currentlyPlaying = Integer.parseInt(element.getAttribute("currentlyPlaying"));
boolean isGameStarted = Boolean.valueOf(element.getAttribute("isGameStarted")).booleanValue();
String version = element.getAttribute("version");
int gameState = Integer.parseInt(element.getAttribute("gameState"));
try {
metaRegister.addServer(name, address, port, slotsAvailable, currentlyPlaying, isGameStarted, version, gameState);
} catch (IOException e) {
return DOMMessage.createMessage("noRouteToServer");
}
return DOMMessage.createMessage("ok");
}
/**
* Handles an "update"-request.
*
* @param connection The connection the message came from.
* @param element The element containing the request.
* @return The reply: <code>null</code>.
*/
private Element update(Connection connection, Element element) {
String name = element.getAttribute("name");
String address = connection.getSocket().getInetAddress().getHostAddress();
int port = Integer.parseInt(element.getAttribute("port"));
int slotsAvailable = Integer.parseInt(element.getAttribute("slotsAvailable"));
int currentlyPlaying = Integer.parseInt(element.getAttribute("currentlyPlaying"));
boolean isGameStarted = Boolean.valueOf(element.getAttribute("isGameStarted")).booleanValue();
String version = element.getAttribute("version");
int gameState = Integer.parseInt(element.getAttribute("gameState"));
try {
metaRegister.updateServer(name, address, port, slotsAvailable, currentlyPlaying, isGameStarted, version, gameState);
} catch (IOException e) {}
return null;
}
/**
* Handles a "remove"-request.
*
* @param connection The connection the message came from.
* @param element The element containing the request.
* @return The reply: <code>null</code>.
*/
private Element remove(Connection connection, Element element) {
String address = connection.getSocket().getInetAddress().getHostAddress();
int port = Integer.parseInt(element.getAttribute("port"));
metaRegister.removeServer(address, port);
return null;
}
/**
* Handles a "disconnect"-request.
*
* @param connection The connection the message came from.
* @param element The element containing the request.
* @return The reply: <code>null</code>.
*/
private Element disconnect(Connection connection, Element element) {
try {
connection.reallyClose();
} catch (IOException e) {
logger.warning("Could not close the connection.");
}
metaServer.removeConnection(connection);
return null;
}
}