001// Copyright 2006 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; 016 017import java.io.Serializable; 018 019/** 020 * An action that is associated with a component. This is used in several areas of Tapestry and is primarily an attempt 021 * to externalize state for a component so that it can be recorded outside the object. 022 * <p/> 023 * ComponentActions should be immutable. They are often created during one request and associated with a particular 024 * component instance. They are then used in a later request (with an equivalent component instance). 025 * <p/> 026 * ComponentActions are serializable (they are often serialized into Base64 strings for storage on the client). 027 */ 028public interface ComponentAction<T> extends Serializable 029{ 030 /** 031 * Passed a component instance, the action should operate upon the instance. 032 */ 033 void execute(T component); 034}