InvokeListener


1   package org.apache.beehive.controls.runtime.bean;
2   /*
3    * Copyright 2004 The Apache Software Foundation.
4    *
5    * Licensed under the Apache License, Version 2.0 (the "License");
6    * you may not use this file except in compliance with the License.
7    * You may obtain a copy of the License at
8    * 
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   *
17   * $Header:$
18   */
19  
20  import java.lang.reflect.Method  ;
21  
22  /**
23   *  The InvokeListener interface can be implemented by contextual services or helper
24   *  classes associated with a ControlBean that want pre/post hook notifications of
25   *  invocations occuring on a ControlBean.
26   *
27   *  Hooking is "read only".  An InvokeListener cannot modify the invoked method,
28   *  arguments, return value or thrown exceptions in any way.
29   */
30  public interface InvokeListener extends java.util.EventListener  
31  {
32      /**
33       * Called just prior to invoking an operation or callback event on a control.
34       */
35      public void preInvoke(Method   m, Object   [] args);
36  
37      /**
38       * Called just after inovcation of an operation or callback event on a control
39       */
40      public void postInvoke(Object   retval, Throwable   t);
41  } 
42

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