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}