com.bigdata.quorum

Enum QuorumEventEnum

java.lang.Object

java.lang.Enum<QuorumEventEnum>

com.bigdata.quorum.QuorumEventEnum

All Implemented Interfaces:

Serializable, Comparable<QuorumEventEnum>

public enum QuorumEventEnum
extends Enum<QuorumEventEnum>

A type-safe enumeration for informational quorum events.

Version:

$Id$

Author:

Bryan Thompson

Enum Constant Summary

Enum Constants

Enum Constant and Description
CAST_VOTE Vote cast by a service for some lastCommitTime.
CONSENSUS A consensus has been achieved with (k+1)/2 services voting for some lastCommitTime.
MEMBER_ADD Event generated when a member service is added to a quorum.
MEMBER_REMOVE Event generated when a member service is removed form a quorum.
PIPELINE_ADD Event generated when a service is added to the write pipeline.
PIPELINE_REMOVE Event generated when a member service is removed from the write pipeline.
QUORUM_BROKE Event generated when a quorum breaks (aka when the token is cleared).
QUORUM_DISCONNECTED Event generated when a service becomes disconnected from a remote quorum (such as a zookeeper ensemble).
QUORUM_MEET Event generated when a quorum meets (aka when the lastValidToken and token are updated atomically).
SERVICE_JOIN Event generated when a service joins a quorum.
SERVICE_LEAVE Event generated when a service leaves a quorum.
WITHDRAW_VOTE Vote for some lastCommitTime was withdrawn by a service.

Method Summary

Methods

Modifier and Type	Method and Description
static QuorumEventEnum	valueOf(String name) Returns the enum constant of this type with the specified name.
static QuorumEventEnum[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

MEMBER_ADD

public static final QuorumEventEnum MEMBER_ADD

Event generated when a member service is added to a quorum.

MEMBER_REMOVE

public static final QuorumEventEnum MEMBER_REMOVE

Event generated when a member service is removed form a quorum.

PIPELINE_ADD

public static final QuorumEventEnum PIPELINE_ADD

Event generated when a service is added to the write pipeline.

PIPELINE_REMOVE

public static final QuorumEventEnum PIPELINE_REMOVE

Event generated when a member service is removed from the write pipeline.

CAST_VOTE

public static final QuorumEventEnum CAST_VOTE

Vote cast by a service for some lastCommitTime.

WITHDRAW_VOTE

public static final QuorumEventEnum WITHDRAW_VOTE

Vote for some lastCommitTime was withdrawn by a service.

CONSENSUS

public static final QuorumEventEnum CONSENSUS

A consensus has been achieved with (k+1)/2 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 #LEADER_ELECTED event.

SERVICE_JOIN

public static final QuorumEventEnum SERVICE_JOIN

Event generated when a service joins a quorum.

SERVICE_LEAVE

public static final QuorumEventEnum SERVICE_LEAVE

Event generated when a service leaves a quorum.

QUORUM_MEET

public static final QuorumEventEnum QUORUM_MEET

Event generated when a quorum meets (aka when the lastValidToken and token are updated atomically).

QUORUM_BROKE

public static final QuorumEventEnum QUORUM_BROKE

Event generated when a quorum breaks (aka when the token is cleared).

QUORUM_DISCONNECTED

public static final QuorumEventEnum QUORUM_DISCONNECTED

Event generated when a service becomes disconnected from a remote quorum (such as a zookeeper ensemble).

Method Detail

values

public static QuorumEventEnum[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (QuorumEventEnum c : QuorumEventEnum.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static QuorumEventEnum valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null