1 /*
2 * EL4J, the Extension Library for the J2EE, adds incremental enhancements to
3 * the spring framework, http://el4j.sf.net
4 * Copyright (C) 2006 by ELCA Informatique SA, Av. de la Harpe 22-24,
5 * 1000 Lausanne, Switzerland, http://www.elca.ch
6 *
7 * EL4J is published under the GNU Lesser General Public License (LGPL)
8 * Version 2.1. See http://www.gnu.org/licenses/
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU Lesser General Public License for more details.
14 *
15 * For alternative licensing, please contact info@elca.ch
16 */
17 package ch.elca.el4j.services.remoting.protocol.loadbalancing.policy;
18
19 import ch.elca.el4j.services.remoting.AbstractRemotingProtocol;
20 import ch.elca.el4j.services.remoting.protocol.loadbalancing.NoProtocolAvailableRTException;
21
22
23 /**
24 *
25 * Chooses protocols according to a round robin policy.
26 *
27 * @svnLink $Revision: 3883 $;$Date: 2009-08-04 15:35:01 +0200 (Di, 04. Aug 2009) $;$Author: swismer $;$URL: https://el4j.svn.sourceforge.net/svnroot/el4j/branches/el4j_3_1/el4j/framework/modules/remoting_core/src/main/java/ch/elca/el4j/services/remoting/protocol/loadbalancing/policy/RoundRobinPolicy.java $
28 *
29 * @author Stefan Pleisch (SPL)
30 */
31 public class RoundRobinPolicy extends AbstractPolicy {
32
33 /** Index of the protocol currently in use. */
34 private int m_currentIndex = -1;
35
36 /**
37 * {@inheritDoc}
38 */
39 @Override
40 public AbstractRemotingProtocol getNextProtocol()
41 throws NoProtocolAvailableRTException {
42 if ((m_protocols == null) || (m_protocols.length == 0)) {
43 throw new NoProtocolAvailableRTException("No protocol defined");
44 }
45 m_currentIndex = (m_currentIndex + 1) % m_protocols.length;
46 return m_protocols[m_currentIndex];
47 }
48 }