001 // Copyright 2006, 2007, 2008 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.tapestry5.services; 016 017 /** 018 * Interface for objects which can periodically check for updates. 019 * <p> 020 * Note that this interface has moved from module tapestry-core to tapestry-ioc, but has kept the same package (for 021 * backwards compatibility reasons). 022 * 023 * @see org.apache.tapestry5.services.UpdateListenerHub 024 * @since 5.1.0.0 025 */ 026 public interface UpdateListener 027 { 028 /** 029 * Invoked to force the receiver to check for updates to whatever underlying resources it makes use of. 030 */ 031 void checkForUpdates(); 032 }