001    /*
002      GRANITE DATA SERVICES
003      Copyright (C) 2011 GRANITE DATA SERVICES S.A.S.
004    
005      This file is part of Granite Data Services.
006    
007      Granite Data Services is free software; you can redistribute it and/or modify
008      it under the terms of the GNU Library General Public License as published by
009      the Free Software Foundation; either version 2 of the License, or (at your
010      option) any later version.
011    
012      Granite Data Services is distributed in the hope that it will be useful, but
013      WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014      FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015      for more details.
016    
017      You should have received a copy of the GNU Library General Public License
018      along with this library; if not, see <http://www.gnu.org/licenses/>.
019    */
020    
021    package org.granite.tide.data;
022    
023    
024    /**
025     *  Interface for data update dispatchers.
026     *  The dispatch is a three step process :
027     * 
028     *      <ul>
029     *  <li>Initialization in the constructor (specific for each implementation), at initialization of <code>DataContext</code></li>
030     *  <li><code>observe()</code> builds the server selector depending on the data that are processed</li>
031     *  <li><code>publish()</code> handles the actual publishing</li>
032     *  </ul>
033     * 
034     *  @see DataContext
035     * 
036     *  @author William Drai
037     */
038    public interface DataDispatcher {
039            
040            public static final String TIDE_DATA_SUBTOPIC = "tideDataTopic";
041            public static final String GDS_SESSION_ID = "GDSSessionID";
042            public static final String TIDE_DATA_TYPE_KEY = "type";
043            public static final String TIDE_DATA_TYPE_VALUE = "DATA";
044            public static final String SERVER_DISPATCHER_GDS_SESSION_ID = "__GDS_SERVER_DISPATCHER__";
045    
046            public void observe();
047            
048            public void publish(Object[][] dataUpdates);
049    }