001    // Copyright 2008, 2010, 2011 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     * A service that allows listeners to be registered to learn about {@link org.apache.tapestry5.Link} creation.
019     */
020    public interface LinkCreationHub
021    {
022        /**
023         * Adds a listener. If the scope of the listener is per-thread, then it must be removed.
024         * 
025         * @param listener
026         */
027        void addListener(LinkCreationListener listener);
028    
029        /**
030         * Adds a listener. If the scope of the listener is per-thread, then it must be removed.
031         * 
032         * @param listener
033         * @since 5.2.0
034         */
035        void addListener(LinkCreationListener2 listener);
036    }