| // Copyright 2004 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry.callback; |
| |
| import java.io.Serializable; |
| |
| import org.apache.tapestry.IRequestCycle; |
| |
| /** |
| * Defines a callback, an object which is used to invoke or reinvoke a method |
| * on an object or component in a later request cycle. This is used to |
| * allow certain operations (say, submitting an order) to defer to other processes |
| * (say, logging in and/or registerring). |
| * |
| * <p>Callbacks must be {@link Serializable}, to ensure that they can be stored |
| * between request cycles. |
| * |
| * @version $Id$ |
| * @author Howard Lewis Ship |
| * @since 0.2.9 |
| * |
| **/ |
| |
| public interface ICallback extends Serializable |
| { |
| /** |
| * Performs the call back. Typical implementation will locate a particular |
| * page or component and invoke a method upon it, or |
| * invoke a method on the {@link IRequestCycle cycle}. |
| * |
| **/ |
| |
| public void performCallback(IRequestCycle cycle); |
| } |