001 // Copyright 2007, 2008 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. 014 015 package org.apache.tapestry5.services; 016 017 import java.io.IOException; 018 019 /** 020 * Filter interface for {@link PageRenderRequestHandler}, which allows extra behaviors to be injected into the 021 * processing of a page render request. 022 */ 023 public interface PageRenderRequestFilter 024 { 025 /** 026 * Invoked to activate and render a page. The return value of the event handler method(s) for the activate event may 027 * result in an action response generator being returned. 028 * 029 * @param parameters defines the page name and activation context 030 * @param handler to delegate the invocation to 031 */ 032 void handle(PageRenderRequestParameters parameters, PageRenderRequestHandler handler) throws IOException; 033 }