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
015package org.apache.tapestry5.services;
016
017import 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 */
023public 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}