001/*
002 * HA-JDBC: High-Availability JDBC
003 * Copyright (c) 2004-2007 Paul Ferraro
004 * 
005 * This library is free software; you can redistribute it and/or modify it 
006 * under the terms of the GNU Lesser General Public License as published by the 
007 * Free Software Foundation; either version 2.1 of the License, or (at your 
008 * option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful, but WITHOUT
011 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
012 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License 
013 * for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public License
016 * along with this library; if not, write to the Free Software Foundation, 
017 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
018 * 
019 * Contact: ferraro@users.sourceforge.net
020 */
021package net.sf.hajdbc.sql;
022
023import java.util.Map;
024import java.util.SortedMap;
025import java.util.TreeMap;
026
027import net.sf.hajdbc.Database;
028
029/**
030 * @author Paul Ferraro
031 *
032 */
033public class DriverWriteInvocationStrategy<D, T, R> implements InvocationStrategy<D, T, R>
034{
035        /**
036         * @see net.sf.hajdbc.sql.InvocationStrategy#invoke(net.sf.hajdbc.sql.SQLProxy, net.sf.hajdbc.sql.Invoker)
037         */
038        @Override
039        public R invoke(SQLProxy<D, T> proxy, Invoker<D, T, R> invoker) throws Exception
040        {
041                SortedMap<Database<D>, R> map = this.invokeAll(proxy, invoker);
042                
043                return map.get(map.firstKey());
044        }
045
046        protected SortedMap<Database<D>, R> invokeAll(SQLProxy<D, T> proxy, Invoker<D, T, R> invoker) throws Exception
047        {
048                SortedMap<Database<D>, R> resultMap = new TreeMap<Database<D>, R>();
049
050                for (Map.Entry<Database<D>, T> entry: proxy.entries())
051                {
052                        Database<D> database = entry.getKey();
053                        
054                        resultMap.put(database, invoker.invoke(database, entry.getValue()));
055                }
056                
057                return resultMap;
058        }
059}