source: src/main/java/geniusweb/runserver/RunNego.java

package geniusweb.runserver;

import java.io.IOException;
import java.util.logging.Level;
import java.util.stream.Collectors;

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

import geniusweb.protocol.NegoSettings;
import tudelft.utilities.logging.ReportToLogger;
import tudelft.utilities.logging.Reporter;

/**
 * Contains incoming connection to run a Nego. runserver/runsession with the
 * JSON {@link NegoSettings} in the request header. After the session is
 * started, the new Nego ID is returned. This can be used to find back the log
 * files..
 */
@SuppressWarnings("serial")
public class RunNego extends HttpServlet {
        private final Reporter log;

        public RunNego() {
                this(new ReportToLogger("runserver"));
        }

        public RunNego(Reporter logger) {
                super();
                this.log = logger;
        }

        /**
         * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
         *      response).
         * 
         * @return the ID of the new started run. Or SC_BAD_REQUEST if the request
         *         can not be processed.
         */
        @Override
        protected void doGet(HttpServletRequest request,
                        HttpServletResponse response) throws ServletException, IOException {
                String reqstring = request.getReader().lines()
                                .collect(Collectors.joining());
                NegoSettings settings;
                try {
                        settings = Jackson.instance().readValue(reqstring,
                                        NegoSettings.class);
                } catch (IOException e) {
                        response.sendError(HttpServletResponse.SC_BAD_REQUEST,
                                        e.getMessage());
                        System.err.println("Run request failed " + reqstring);
                        e.printStackTrace(); // helpful for debugging run requests
                        return;
                }
                log.log(Level.INFO, "request to run Nego: " + settings);
                RunningNego running = new RunningNego(settings,
                                RunningNegotiationsRepo.instance(), log);
                running.start();
                // set content type to prevent some browsers
                // trying to parse this (eg as XML)
                response.setContentType("application/json");
                response.getWriter().append(running.getID());
        }

        /**
         * @see #doGet(HttpServletRequest, HttpServletResponse)
         */
        @Override
        protected void doPost(HttpServletRequest request,
                        HttpServletResponse response) throws ServletException, IOException {
                doGet(request, response);
        }

}