/**
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;
/**
* A type-safe enumeration for informational quorum events.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public enum QuorumEventEnum {
/**
* Event generated when a member service is added to a quorum.
*/
MEMBER_ADD,
/**
* Event generated when a member service is removed form a quorum.
*/
MEMBER_REMOVE,
/**
* Event generated when a service is added to the write pipeline.
*/
PIPELINE_ADD,
/**
* Event generated when a member service is removed from the write pipeline.
*/
PIPELINE_REMOVE,
/**
* Vote cast by a service for some lastCommitTime.
*/
CAST_VOTE,
/**
* Vote for some lastCommitTime was withdrawn by a service.
*/
WITHDRAW_VOTE,
/**
* A consensus has been achieved with <code>(k+1)/2</code> services voting
* for some lastCommitTime. This event will typically be associated with an
* invalid quorum token since the quorum token is assigned when the leader
* is elected and this event generally becomes visible before the
* {@link #LEADER_ELECTED} event.
*/
CONSENSUS,
/**
* Event generated when a service joins a quorum.
*/
SERVICE_JOIN,
/**
* Event generated when a service leaves a quorum.
*/
SERVICE_LEAVE,
// /**
// * Event generated when a service joins a quorum as a follower.
// */
// ELECTED_FOLLOWER,
// /**
// * Event generated when a new leader is elected, including when a quorum
// * meets.
// */
// ELECTED_LEADER,
// /**
// * Event generated when the (lastValidToken,token) are atomically updated.
// */
// SET_LAST_VALID_TOKEN,
/**
* Event generated when a quorum meets (aka when the lastValidToken and
* token are updated atomically).
*/
QUORUM_MEET,
/**
* Event generated when a quorum breaks (aka when the token is cleared).
*/
QUORUM_BROKE,
/**
* Event generated when a service becomes disconnected from a remote quorum
* (such as a zookeeper ensemble).
*/
QUORUM_DISCONNECTED;
}