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
015package 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 */
026public 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}