ExceptionPresenter


1   // Copyright 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.error;
16  
17  import org.apache.tapestry.IRequestCycle;
18  
19  /**
20   * Invoked by the {@link org.apache.tapestry.IEngine} if there's an uncaught exception
21   * (checked or runtime) processing a request. The ExceptionPresenter is responsible for presenting a
22   * exception message (or description) to the user. The default implementation activates the
23   * "Exception" page, but it is common to override this to do something application specific
24   * (typically, return to the Home page and display an error message there). This service also
25   * provides a good hook for creating a server-side log of exceptions.
26   * 
27   * @author Howard M. Lewis Ship
28   * @since 4.0
29   * @see RequestExceptionReporter
30   */
31  public interface ExceptionPresenter
32  {
33      /**
34       * Report the exception and provide some response to the user in lieu of the expected result
35       * page.
36       * 
37       * @param cycle
38       *            the current request cycle
39       * @param cause
40       *            the exception that was caught
41       */
42  
43      public void presentException(IRequestCycle cycle, Throwable   cause);
44  }

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