001// Copyright 2007 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.internal.services;
016
017import org.apache.tapestry5.ComponentResources;
018
019/**
020 * A kind of callback that can easily be injected into a transformed class to perform complex work.
021 * <p/>
022 * These callbacks are often injected into a transformed component class via {@link
023 * org.apache.tapestry5.services.ClassTransformation#addInjectedField(Class, String, Object)}. Bear in mind that such
024 * callbacks must be <em>threadsafe</em>, since every instance of such a class will share a single instance of the
025 * operation.
026 */
027public interface ComponentResourcesOperation
028{
029    /**
030     * Perform some operation that requires the components' resources.
031     */
032    void perform(ComponentResources resources);
033}