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}