001// Licensed under the Apache License, Version 2.0 (the "License");
002// you may not use this file except in compliance with the License.
003// You may obtain a copy of the License at
004//
005// http://www.apache.org/licenses/LICENSE-2.0
006//
007// Unless required by applicable law or agreed to in writing, software
008// distributed under the License is distributed on an "AS IS" BASIS,
009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
010// See the License for the specific language governing permissions and
011// limitations under the License.
012
013package org.apache.tapestry5.ioc.services;
014
015/**
016 * Interface for objects which can periodically check for updates.
017 *
018 * Note that this interface has moved from module tapestry-core to tapestry-ioc, but has kept the same package (for
019 * backwards compatibility reasons).
020 * 
021 * @see org.apache.tapestry5.ioc.services.UpdateListenerHub
022 * @since 5.1.0.0
023 */
024public interface UpdateListener
025{
026    /**
027     * Invoked to force the receiver to check for updates to whatever underlying resources it makes use of.
028     */
029    void checkForUpdates();
030}