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


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.Command;
33
34 /**
35  * A stateless peer object used to render the given type of
36  * <code>nextapp.echo2.app.Command</code> to the client.
37  * <p>
38  * A <strong>single</strong> instance of a given
39  * <code>CommandSynchronizePeer</code> will be created to synchronize the state
40  * of <strong>ALL</strong> instances of a particular class of
41  * <code>Command</code>. Thus, it is not possible to
42  * store information about a command's state in this object.
43  */
44 public interface CommandSynchronizePeer {
45     
46     /**
47      * Renders a directive to execute the command on the client.
48      *
49      * @param rc the relevant <code>RenderContext</code>
50      * @param command the <code>Command</code> to execute
51      */
52     public void render(RenderContext rc, Command command);
53 }
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