es.tid.cep.esperanza.Events.java Source code

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Here is the source code for es.tid.cep.esperanza.Events.java

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/*
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 * and open the template in the editor.
 */
package es.tid.cep.esperanza;

import com.espertech.esper.client.EPServiceProvider;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Map;
import javax.servlet.ServletContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.json.JSONException;

import org.json.JSONObject;

/**
 *
 * @author brox
 */
@WebServlet(name = "Events", loadOnStartup = 2, urlPatterns = { "/events" })
public class Events extends HttpServlet {

    private static final Logger logger = LoggerFactory.getLogger(Events.class);
    EPServiceProvider epService;

    @Override
    public void init() {
        ServletContext sc = getServletContext();
        epService = Utils.initEPService(sc);
        logger.debug("init at events servlet");
    }

    @Override
    public void destroy() {
        Utils.destroyEPService(getServletContext());
        logger.debug("destroy at events servlet");
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        logger.debug("events doPost");
        PrintWriter out = response.getWriter();
        try {
            response.setContentType("application/json;charset=UTF-8");
            ServletInputStream sis = request.getInputStream();
            byte[] b = new byte[request.getContentLength()];
            sis.read(b, 0, b.length);
            sis.close();
            String eventText = new String(b);
            logger.debug("event as text:" + eventText);
            org.json.JSONObject jo = new JSONObject(eventText);
            logger.debug("event as JSONObject: " + jo);
            Map<String, Object> otro = Utils.JSONObject2Map(jo);
            logger.debug("event as map: " + otro);
            epService.getEPRuntime().sendEvent(otro, "iotEvent");
            logger.debug("event was sent: " + otro);
        } catch (JSONException je) {
            logger.debug("error: " + je.getMessage());
            response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
            out.printf("{\"error\":\"%s\"}\n", je.getMessage());

        } finally {
            out.close();
        }
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Events server";
    }// </editor-fold>

}