appserver/tests/appserv-tests/devtests/web/servlet-3.0/asyncContextDispatchZeroArg/servlet/test/TestServlet.java

/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package test;

import java.io.*;
import java.util.*;
import jakarta.servlet.*;
import jakarta.servlet.http.*;

public class TestServlet extends HttpServlet {

    public void doGet(HttpServletRequest req, HttpServletResponse res)
            throws IOException, ServletException {

        if (!req.isAsyncSupported()) {
            throw new ServletException("Async not supported when it should");
        }
        if (!"MYVALUE".equals(req.getAttribute("MYNAME"))) {
            final AsyncContext ac = req.startAsync();
            req.setAttribute("MYNAME", "MYVALUE");

            Timer asyncTimer = new Timer("AsyncTimer", true);
            asyncTimer.schedule(
                new TimerTask() {
                    @Override
                    public void run() {
                        ac.dispatch();
                    }
                },
                5000);
        } else {
            // Async re-dispatched request
            res.getWriter().println("Hello world");
        }
    }

}