    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    }