001 // Copyright 2004, 2005 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. 014 015 package org.apache.tapestry; 016 017 /** 018 * A particular type of component usuable with the 019 * action service. 020 * 021 * @author Howard Lewis Ship 022 * @since 1.0.1 023 */ 024 025 public interface IAction extends IComponent 026 { 027 /** 028 * Returns true if the component requires 029 * an existing, not new, {@link javax.servlet.http.HttpSession} 030 * to operate. Components who are not dependant on page state 031 * (or the visit object) are non-stateful and can return false. 032 * 033 **/ 034 035 public boolean getRequiresSession(); 036 }