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Java > Open Source Codes > org > apache > tapestry > IDirect


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;
16
17 /**
18  * Interface that defines classes that may be messaged by the direct
19  * service.
20  *
21  * @author Howard Lewis Ship
22  **/
23
24 public interface IDirect extends IComponent
25 {
26     /**
27      * Invoked by the direct service to have the component peform
28      * the appropriate action. The {@link org.apache.tapestry.link.DirectLink} component will
29      * notify its listener.
30      *
31      **/
32
33     public void trigger(IRequestCycle cycle);
34
35     /**
36      * Invoked by the direct service to query the component as to
37      * whether it is stateful. If stateful and no
38      * {@link javax.servlet.http.HttpSession} is active, then a
39      * {@link org.apache.tapestry.StaleSessionException} is
40      * thrown by the service.
41      *
42      * @since 2.3
43      *
44      **/
45
46     public boolean isStateful();
47
48 }
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