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
023/**
024 * Defines a strategy for invoking an invoker.
025 * @author Paul Ferraro
026 * @param <D> Type of the root object (e.g. driver, datasource)
027 * @param <T> Target object type of the invocation
028 * @param <R> Return type of this invocation
029 */
030public interface InvocationStrategy<D, T, R>
031{
032        /**
033         * Invoke the specified invoker against the specified proxy.
034         * @param proxy a JDBC object proxy
035         * @param invoker an invoker
036         * @return a result
037         * @throws Exception if the invocation fails
038         */
039        R invoke(SQLProxy<D, T> proxy, Invoker<D, T, R> invoker) throws Exception;
040}