LearnInJava/IntroducingJavaEE7Sources/src/java/org/javaee7/chapter11/ReporterServlet.java at master · ArianZhang/LearnInJava · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95

package org.javaee7.chapter11;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.concurrent.Future;
import javax.annotation.Resource;
import javax.enterprise.concurrent.ManagedExecutorService;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Juneau
 */
@WebServlet(name = "ReporterServlet", urlPatterns = {"/ReporterServlet"})
public class ReporterServlet extends HttpServlet {

    @Resource(name = "concurrent/BatchExecutor")
    ManagedExecutorService mes;

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {

            out.println("<html>");
            out.println("<head>");
            out.println("<title>Job Report Invoker</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h2>This servlet initiates the job report task.  Please look "
                    + "in the server log to see the results.</h2> <br />" +
                    " This task is not run asynchronously, the task will process independently.");
            out.println("<br/><br/>");
            ReporterTask reporterTask = new ReporterTask("JobsReport");
            Future reportFuture = mes.submit(reporterTask);
            while( !reportFuture.isDone() )
                out.println("Running...<BR>");
            if (reportFuture.isDone()){
                out.println("Report Complete");
            }
            out.println("</body>");
            out.println("</html>");
        } finally {
            out.close();
        }
    }


    // <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>
}