01: /*
02: * This file is part of the Echo Web Application Framework (hereinafter "Echo").
03: * Copyright (C) 2002-2005 NextApp, Inc.
04: *
05: * Version: MPL 1.1/GPL 2.0/LGPL 2.1
06: *
07: * The contents of this file are subject to the Mozilla Public License Version
08: * 1.1 (the "License"); you may not use this file except in compliance with
09: * 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)
56: .getApplicationInstance();
57: return app.hasQueuedTasks();
58: }
59: }
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