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Java > Open Source Codes > nextapp > echo2 > webcontainer > ContainerAsyncMonitorService


1 /*
2  * This file is part of the Echo Web Application Framework (hereinafter "Echo").
3  * Copyright (C) 2002-2005 NextApp, Inc.
4  *
5  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6  *
7  * The contents of this file are subject to the Mozilla Public License Version
8  * 1.1 (the "License"); you may not use this file except in compliance with
9  * the License. You may obtain a copy of the License at
10  * http://www.mozilla.org/MPL/
11  *
12  * Software distributed under the License is distributed on an "AS IS" basis,
13  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14  * for the specific language governing rights and limitations under the
15  * License.
16  *
17  * Alternatively, the contents of this file may be used under the terms of
18  * either the GNU General Public License Version 2 or later (the "GPL"), or
19  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
20  * in which case the provisions of the GPL or the LGPL are applicable instead
21  * of those above. If you wish to allow use of your version of this file only
22  * under the terms of either the GPL or the LGPL, and not to allow others to
23  * use your version of this file under the terms of the MPL, indicate your
24  * decision by deleting the provisions above and replace them with the notice
25  * and other provisions required by the GPL or the LGPL. If you do not delete
26  * the provisions above, a recipient may use your version of this file under
27  * the terms of any one of the MPL, the GPL or the LGPL.
28  */
29
30 package nextapp.echo2.webcontainer;
31
32 import nextapp.echo2.app.ApplicationInstance;
33 import nextapp.echo2.webrender.Service;
34 import nextapp.echo2.webrender.UserInstance;
35 import nextapp.echo2.webrender.service.AsyncMonitorService;
36
37 /**
38  * Web Container implementation of <code>AsyncMonitorService</code>.
39  * Determines if a given application instance requires immediate
40  * client-server synchronization by querying
41  * <code>ApplicationInstance.hasQueuedTasks()</code>.
42  */
43 public class ContainerAsyncMonitorService extends AsyncMonitorService {
44
45     /**
46      * Singleton instance.
47      */
48     public static final Service INSTANCE = new ContainerAsyncMonitorService();
49
50     /**
51      * @see nextapp.echo2.webrender.service.AsyncMonitorService#isSynchronizationRequired(
52      * nextapp.echo2.webrender.UserInstance)
53      */
54     public boolean isSynchronizationRequired(UserInstance userInstance) {
55         ApplicationInstance app = ((ContainerInstance) userInstance).getApplicationInstance();
56         return app.hasQueuedTasks();
57     }
58 }
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