01: /*
02: * HA-JDBC: High-Availability JDBC
03: * Copyright (c) 2004-2007 Paul Ferraro
04: *
05: * This library is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU Lesser General Public License as published by the
07: * Free Software Foundation; either version 2.1 of the License, or (at your
08: * option) any later version.
09: *
10: * This library is distributed in the hope that it will be useful, but WITHOUT
11: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
13: * for more details.
14: *
15: * You should have received a copy of the GNU Lesser General Public License
16: * along with this library; if not, write to the Free Software Foundation,
17: * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18: *
19: * Contact: ferraro@users.sourceforge.net
20: */
21: package net.sf.hajdbc.sql;
22:
23: /**
24: * Defines a strategy for invoking an invoker.
25: * @author Paul Ferraro
26: * @param <D> Type of the root object (e.g. driver, datasource)
27: * @param <T> Target object type of the invocation
28: * @param <R> Return type of this invocation
29: */
30: public interface InvocationStrategy<D, T, R> {
31: /**
32: * Invoke the specified invoker against the specified proxy.
33: * @param proxy a JDBC object proxy
34: * @param invoker an invoker
35: * @return a result
36: * @throws Exception if the invocation fails
37: */
38: R invoke(SQLProxy<D, T> proxy, Invoker<D, T, R> invoker)
39: throws Exception;
40: }
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