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}