001    // Copyright 2007 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.internal.services;
016    
017    import org.apache.tapestry5.Link;
018    import org.apache.tapestry5.services.PersistentFieldChange;
019    import org.apache.tapestry5.services.PersistentFieldStrategy;
020    
021    /**
022     * Describes an object that can store {@link PersistentFieldChange}s, and manage a query parameter stored into a {@link
023     * Link} to maining this data across requests.
024     */
025    public interface ClientPersistentFieldStorage extends PersistentFieldStrategy
026    {
027        /**
028         * Updates a link, adding a query parameter to it (if necessary) to store
029         *
030         * @param link
031         */
032        void updateLink(Link link);
033    }