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package org.javaee7.concurrency.managedscheduledexecutor;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Resource;
import javax.enterprise.concurrent.ManagedScheduledExecutorService;
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 arungup
*/
@WebServlet(urlPatterns = { "/ScheduleServlet" })
public class ScheduleServlet extends HttpServlet {
// @Resource(name = "concurrent/myScheduledExecutor2")
@Resource(name = "DefaultManagedScheduledExecutorService")
ManagedScheduledExecutorService executor;
/**
* Processes requests for both HTTP
* <code>GET</code> and
* <code>POST</code> methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
try (PrintWriter out = response.getWriter()) {
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>Schedule using Callable after 5 seconds</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Schedule using Callable after 5 seconds</h1>");
out.println("<h2>Scheduling tasks using Callable</h2>");
ScheduledFuture<Product> future = executor.schedule(new MyCallableTask(5), 5, TimeUnit.SECONDS);
while (true) {
if (future.isDone()) {
break;
} else {
System.out.println("Checking Callable Future, waiting for 1 sec");
Thread.sleep(1000);
}
}
out.println("Callable Task completed: " + future.get().getId());
out.println("<h2>Scheduling tasks using Runnable</h2>");
ScheduledFuture<?> f = executor.schedule(new MyRunnableTask(10), 5, TimeUnit.SECONDS);
while (true) {
if (f.isDone()) {
break;
} else {
System.out.println("Checking Runnable Future, waiting for 1 sec");
Thread.sleep(1000);
}
}
out.println("Runnable Task completed: " + future.get().getId());
out.println("<br><br>Check server.log for output");
out.println("</body>");
out.println("</html>");
} catch (InterruptedException | ExecutionException ex) {
Logger.getLogger(ScheduleServlet.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>
}