com.sleepycat.je.rep

Enum NodeType

java.lang.Object

java.lang.Enum<NodeType>

com.sleepycat.je.rep.NodeType

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<NodeType>

public enum NodeType
extends java.lang.Enum<NodeType>

The different types of nodes that can be in a replication group.

Enum Constant Summary

Enum Constants

Enum Constant and Description
ARBITER
ELECTABLE A full fledged member of the replication group with an associated replicated environment that can serve as both a Master and a Replica.
MONITOR A node that passively listens for the results of elections, but does not participate in them.
SECONDARY A member of the replication group with an associated replicated environment that serves as a Replica but does not participate in elections or durability decisions.

Method Summary

Modifier and Type	Method and Description
boolean	isArbiter() Returns whether this is the ARBITER type.
boolean	isDataNode() Returns whether this type represents a data node, either ELECTABLE or SECONDARY.
boolean	isElectable() Returns whether this is the ELECTABLE type.
boolean	isMonitor() Returns whether this is the MONITOR type.
boolean	isSecondary() Returns whether this is the SECONDARY type.
static NodeType	valueOf(java.lang.String name) Returns the enum constant of this type with the specified name.
static NodeType[]	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

MONITOR

public static final NodeType MONITOR

A node that passively listens for the results of elections, but does not participate in them. It does not have a replicated environment associated with it.

See Also:

Monitor

ELECTABLE

public static final NodeType ELECTABLE

A full fledged member of the replication group with an associated replicated environment that can serve as both a Master and a Replica.

SECONDARY

public static final NodeType SECONDARY

A member of the replication group with an associated replicated environment that serves as a Replica but does not participate in elections or durability decisions. Secondary nodes are only remembered by the group while they maintain contact with the Master.

You can use SECONDARY nodes to:

• Provide a copy of the data available at a distant location
• Maintain an extra copy of the data to increase redundancy
• Change the number of replicas to adjust to dynamically changing read loads

Since:

6.0

ARBITER

public static final NodeType ARBITER

Method Detail

values

public static NodeType[] 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 (NodeType c : NodeType.values())
    System.out.println(c);

Returns:

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

valueOf

public static NodeType valueOf(java.lang.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:

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

java.lang.NullPointerException - if the argument is null

isMonitor

public boolean isMonitor()

Returns whether this is the MONITOR type.

Returns:

whether this is MONITOR

Since:

6.0

isElectable

public boolean isElectable()

Returns whether this is the ELECTABLE type.

Returns:

whether this is ELECTABLE

Since:

6.0

isSecondary

public boolean isSecondary()

Returns whether this is the SECONDARY type.

Returns:

whether this is SECONDARY

Since:

6.0

isDataNode

public boolean isDataNode()

Returns whether this type represents a data node, either ELECTABLE or SECONDARY.

Returns:

whether this represents a data node

Since:

6.0

isArbiter

public boolean isArbiter()

Returns whether this is the ARBITER type.

Returns:

whether this is ARBITER

Since:

6.0