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
021package 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 */
038public 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}