    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.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.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}