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Java > Open Source Codes > org > apache > tapestry > callback > ICallback


1 // Copyright 2004, 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.callback;
16
17 import java.io.Serializable JavaDoc;
18
19 import org.apache.tapestry.IRequestCycle;
20
21 /**
22  * Defines a callback, an object which is used to invoke or reinvoke a method
23  * on an object or component in a later request cycle. This is used to
24  * allow certain operations (say, submitting an order) to defer to other processes
25  * (say, logging in and/or registerring).
26  *
27  * <p>Callbacks must be {@link Serializable}, to ensure that they can be stored
28  * between request cycles.
29  *
30  * @author Howard Lewis Ship
31  * @since 0.2.9
32  *
33  **/
34
35 public interface ICallback extends Serializable JavaDoc
36 {
37     /**
38      * Performs the call back. Typical implementation will locate a particular
39      * page or component and invoke a method upon it, or
40      * invoke a method on the {@link IRequestCycle cycle}.
41      *
42      **/
43
44     public void performCallback(IRequestCycle cycle);
45 }
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