BuilderServlet.java

package org.javaee7.chapter11;

import java.io.IOException;
import java.io.PrintWriter;
import java.math.BigDecimal;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Resource;
import javax.enterprise.concurrent.ManagedExecutorService;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@WebServlet(name = "BuilderServlet", urlPatterns = {"/builderServlet"})
public class BuilderServlet extends HttpServlet implements Servlet {
    // Retrieve our executor instance.

    @Resource(name = "concurrent/BuilderExecutor") 
    ManagedExecutorService mes;
    EmployeeInfo employeeInfo;

    protected void processRequest(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        try {
            PrintWriter out = resp.getWriter();
            // Create the task instances
            Future<EmployeeInfo> empFuture = mes.submit(new EmployeeTask(new BigDecimal(1)));
            Future<EmployeeInfo> empFuture2 = mes.submit(new EmployeeTask(new BigDecimal(2)));

            EmployeeInfo empInfo = empFuture.get();
            EmployeeInfo empInfo2 = empFuture2.get();
            // Process Results
            
        } catch (InterruptedException|ExecutionException ex) {
            Logger.getLogger(BuilderServlet.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
    
     // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</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 doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * 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 {
        processRequest(request, response);
    }

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

    
}