    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}