1 /*
2 * JBoss, Home of Professional Open Source
3 * Copyright 2014, Red Hat, Inc. and/or its affiliates, and individual
4 * contributors by the @authors tag. See the copyright.txt in the
5 * distribution for a full listing of individual contributors.
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.jboss.as.quickstarts.servlet.async;
18
19 import java.io.PrintWriter;
20 import java.text.SimpleDateFormat;
21 import java.util.Date;
22 import java.util.logging.Level;
23 import java.util.logging.Logger;
24
25 import javax.ejb.Asynchronous;
26 import javax.ejb.Stateless;
27 import javax.servlet.AsyncContext;
28
29 /**
30 * A simple service to simulate the execution of a long running task.
31 *
32 * @author Christian Sadilek <csadilek@redhat.com>
33 */
34 @Stateless
35 public class LongRunningService {
36
37 private final Logger logger = Logger.getLogger(LongRunningService.class.getName());
38
39 /**
40 * The use of {@link Asynchronous} causes this EJB method to be executed asynchronously, by a different thread from a
41 * dedicated, container managed thread pool.
42 *
43 * @param asyncContext the context for a suspended Servlet request that this EJB will complete later.
44 */
45 @Asynchronous
46 public void readData(AsyncContext asyncContext) {
47 try {
48 // This is just to simulate a long running operation for demonstration purposes.
49 Thread.sleep(5000);
50
51 PrintWriter writer = asyncContext.getResponse().getWriter();
52 writer.println(new SimpleDateFormat("HH:mm:ss").format(new Date()));
53 writer.close();
54
55 asyncContext.complete();
56 } catch (Exception e) {
57 logger.log(Level.SEVERE, e.getMessage(), e);
58 }
59 }
60 }