Join.java :  » Game » mages » org » mega » gasp » platform » servlets » Android Open Source

/***
 * GASP: a gaming services platform for mobile multiplayer games.
 * Copyright (C) 2004 CNAM/INT
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Contact: gasp-team@objectweb.org
 *
 * Author: Romain Pellerin
 */
package org.mega.gasp.platform.servlets;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Hashtable;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.aksonov.mages.entities.PlayerInfo;
import org.apache.log4j.Category;
import org.mega.gasp.event.DataEvent;
import org.mega.gasp.event.impl.DataEventImpl;
import org.mega.gasp.moods.CustomTypes;
import org.mega.gasp.platform.ApplicationInstance;
import org.mega.gasp.platform.impl.PlatformImpl;

/**
 * This servlet provide to the user to join an ApplicationInstance. The HTTP
 * parameters are : - sID the Session ID of the user - aIID the
 * ApplicationInstanceID
 * 
 * @author PELLERIN Romain (pellerin@cnam.fr) - MEGA Project
 */
public class Join extends HttpServlet {

  private int aSID;
  private Category cat;
  private PlatformImpl platform;

  public void init() {
    ServletContext app = getServletContext();
    platform = PlatformImpl.getPlatform();
    cat = Category.getInstance("JoinServlet");
  }

  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws IOException, ServletException {
  }

  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws IOException, ServletException {
    try {
      // get http request parameters for login
      short sID = Short.parseShort(request.getParameter("sID"));
      String applicationInstanceID = request.getParameter("aIID");
      cat.debug("JoinServlet: called");

      if (applicationInstanceID==null || applicationInstanceID.equals("")) {
        // Join Randomly an Application Instance
        cat.debug("JoinServlet: join random");
        aSID = PlatformImpl.getPlatform().joinAIRnd(sID);
      } else {
        // Join the specific Application Instance
        cat
            .debug("JoinServlet: join AI(" + applicationInstanceID
                + ")");
        short aIID = Short.parseShort(applicationInstanceID);
        aSID = PlatformImpl.getPlatform().joinAI(sID, aIID);
      }

      if (aSID != 0) {
        // reading custom data (if any)
        boolean getCustomData = request.getParameter("custom_data") != null
            && request.getParameter("custom_data").equals("1");

        if (getCustomData) {
          cat.debug("Reading custom data for Create");
          DataInputStream dis = new DataInputStream(request
              .getInputStream());

          ApplicationInstance appIns = platform
              .getActorSessionOwner(aSID);
          CustomTypes customTypes = appIns.getCustomTypes();

          Hashtable h = customTypes.decodeData(dis);

          if (h.size() != 0 && h.get("0") instanceof PlayerInfo) {
            cat
                .debug("Received data from client, number of objects: "
                    + h.size());
            PlayerInfo info = (PlayerInfo) h.get("0");
            if (appIns.getServer().couldJoin(info)) {
              DataEvent de = new DataEventImpl(aSID, h);
              appIns.onDataEvent(de);
            } else {
              aSID = 0;
              cat.debug("Cannot be join because position is busy!");
            }
          } else {
            aSID = 0;
            cat.debug("PlayerInfo is absent");
          }

          dis.close();
        }
      }

      // write the short sID in the http response
      DataOutputStream dos = new DataOutputStream(response
          .getOutputStream());
      response.setContentType("application/octet-stream");
      response.setContentLength(2);
      dos.writeShort(aSID);
      dos.close();
    } catch (Exception e) {
      e.printStackTrace();
      cat.info("cannot comply to received join request " + e);
    }
  }
}