/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Jun 2, 2010
*/
package com.bigdata.quorum;
/**
* An interface for receiving informational quorum events. These events are
* intended for clients interested in quorum state changes. Services that are HA
* aware use a more intimate API to handle the state changes.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public interface QuorumListener {
/**
* Notify the client of a quorum event.
* <p>
* The listener MUST NOT take any event that could block. In particular, it
* MUST NOT wait on another thread that will access the {@link Quorum} as
* that will cause a deadlock around the internal lock maintained by the
* {@link Quorum}.
*/
void notify(QuorumEvent e);
}