org.apache.nifi.cluster.coordination.node

Enum NodeConnectionState

java.lang.Object

java.lang.Enum<NodeConnectionState>

org.apache.nifi.cluster.coordination.node.NodeConnectionState

All Implemented Interfaces:

Serializable, Comparable<NodeConnectionState>

public enum NodeConnectionState
extends Enum<NodeConnectionState>

Enum Constant Summary

Enum Constants

Enum Constant and Description
CONNECTED A node that is connected to the cluster.
CONNECTING A node has issued a connection request to the cluster, but has not yet sent a heartbeat.
DISCONNECTED A node that is not connected to the cluster.
DISCONNECTING A node that is in the process of disconnecting from the cluster.
REMOVED A NodeConnectionState of REMOVED indicates that the node was removed from the cluster and is used in order to notify other nodes in the cluster.

Method Summary

Modifier and Type	Method and Description
static NodeConnectionState	valueOf(String name) Returns the enum constant of this type with the specified name.
static NodeConnectionState[]	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

CONNECTING

public static final NodeConnectionState CONNECTING

A node has issued a connection request to the cluster, but has not yet sent a heartbeat. A connecting node can transition to DISCONNECTED or CONNECTED. The cluster will not accept any external requests to change the flow while any node is in this state.

CONNECTED

public static final NodeConnectionState CONNECTED

A node that is connected to the cluster. A connecting node transitions to connected after the cluster receives the node's first heartbeat. A connected node can transition to disconnecting.

DISCONNECTING

public static final NodeConnectionState DISCONNECTING

A node that is in the process of disconnecting from the cluster. A DISCONNECTING node will always transition to DISCONNECTED.

DISCONNECTED

public static final NodeConnectionState DISCONNECTED

A node that is not connected to the cluster. A DISCONNECTED node can transition to CONNECTING.

REMOVED

public static final NodeConnectionState REMOVED

A NodeConnectionState of REMOVED indicates that the node was removed from the cluster and is used in order to notify other nodes in the cluster.

Method Detail

values

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

Returns:

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

valueOf

public static NodeConnectionState 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