gwap.game.quiz.PlayNCommunicationResource.java Source code

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Here is the source code for gwap.game.quiz.PlayNCommunicationResource.java

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/*
 * This file is part of gwap, an open platform for games with a purpose
 *
 * Copyright (C) 2013
 * Project play4science
 * Lehr- und Forschungseinheit fr Programmier- und Modellierungssprachen
 * Ludwig-Maximilians-Universitt Mnchen
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package gwap.game.quiz;

import gwap.game.quiz.tools.FacesContextBuilder;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.el.ValueExpression;
import javax.faces.context.FacesContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.transaction.Status;

import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.Logger;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.annotations.Startup;
import org.jboss.seam.annotations.intercept.BypassInterceptors;
import org.jboss.seam.log.Log;
import org.jboss.seam.servlet.ContextualHttpServletRequest;
import org.jboss.seam.transaction.Transaction;
import org.jboss.seam.web.AbstractResource;
import org.json.simple.JSONObject;

/**
 * This servlet provides a new Quiz Game for the PlayN-HTML5-Interface by
 * returning a HttpServletRespone in JSON-Format
 * 
 * @author Jonas Hlzler
 * 
 */
@Startup
@Scope(ScopeType.APPLICATION)
@Name("playNCommunicationResource")
@BypassInterceptors
public class PlayNCommunicationResource extends AbstractResource {
    @Logger
    private Log logger;

    private HttpServletRequest request;

    private HttpServletResponse response;

    private ExpressionFactory elFactory;

    private ELContext elc;

    private HttpSession ses;

    private QuizSessionBean quizSessionBean;

    @Override
    public String getResourcePath() {
        return "/quiz";
    }

    @Override
    public void getResource(final HttpServletRequest request, final HttpServletResponse response)
            throws ServletException, IOException {
        new ContextualHttpServletRequest(request) {
            @Override
            public void process() throws IOException {
                doWork(request, response);
            }
        }.run();
    }

    private void doWork(HttpServletRequest request, HttpServletResponse response) throws IOException {

        // HttpSession session = request.getSession();
        this.request = request;
        this.response = response;

        ses = request.getSession();
        SessionTracker.instance().add(ses);

        // }

        // give it ten trys to find a valid game configuration
        for (int ii = 0; ii < 10; ++ii) {
            JSONObject jsonObject = createJSONObjectForNewGame();
            if (jsonObject != null) {

                jsonObject.put("SID", ses.getId());
                InputStream instream = null;
                OutputStream outstream = null;

                try {
                    instream = request.getInputStream();
                    response.setContentType("text/plain");
                    outstream = response.getOutputStream();
                    BufferedWriter out = new BufferedWriter(new OutputStreamWriter(outstream));
                    jsonObject.writeJSONString(out);
                    out.flush();
                    outstream.flush();
                    outstream.close();

                    instream.close();
                    logger.info("Successfully initialized game");
                    break;
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } else {
                logger.info("Couldn't initialize a game in try no." + ii);
            }

        }

    }

    /**
     * Sets up a new Quiz Game Session
     * 
     * @return gameArray Array for JSON
     */
    private JSONObject createJSONObjectForNewGame() {

        try {
            /*
             * setting up dummy JSF FacesContext
             */
            if (Transaction.instance().getStatus() == Status.STATUS_NO_TRANSACTION) {
                Transaction.instance().begin();
            }
            // Conversation.instance().begin();
            FacesContext facesContext = new FacesContextBuilder().getFacesContext(request, response,
                    request.getSession());
            this.elc = facesContext.getELContext();

            this.elFactory = facesContext.getApplication().getExpressionFactory();

            ValueExpression mexp = elFactory.createValueExpression(elc, "#{quizSession}", QuizSessionBean.class);
            this.quizSessionBean = (QuizSessionBean) mexp.getValue(elc);
            ses.setAttribute("quizSession", quizSessionBean);

            JSONObject jsonResult = quizSessionBean.getJSONResult();

            facesContext.release();
            Transaction.instance().commit();

            return jsonResult;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }

}