001// Copyright 2005 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.tapestry.error; 016 017import org.apache.tapestry.IRequestCycle; 018 019/** 020 * Invoked by the {@link org.apache.tapestry.IEngine} if there's an uncaught exception 021 * (checked or runtime) processing a request. The ExceptionPresenter is responsible for presenting a 022 * exception message (or description) to the user. The default implementation activates the 023 * "Exception" page, but it is common to override this to do something application specific 024 * (typically, return to the Home page and display an error message there). This service also 025 * provides a good hook for creating a server-side log of exceptions. 026 * 027 * @author Howard M. Lewis Ship 028 * @since 4.0 029 * @see RequestExceptionReporter 030 */ 031public interface ExceptionPresenter 032{ 033 /** 034 * Report the exception and provide some response to the user in lieu of the expected result 035 * page. 036 * 037 * @param cycle 038 * the current request cycle 039 * @param cause 040 * the exception that was caught 041 */ 042 043 public void presentException(IRequestCycle cycle, Throwable cause); 044}