com.hazelcast.instance.impl

Enum NodeState

java.lang.Object

java.lang.Enum<NodeState>

com.hazelcast.instance.impl.NodeState

All Implemented Interfaces:

Serializable, Comparable<NodeState>

public enum NodeState
extends Enum<NodeState>

Possible states of a Node during its lifecycle. Some actions/operations may be allowed or denied according to current state of the Node.

Since:

3.6

See Also:

Node.start(), Node.shutdown(boolean), AllowedDuringPassiveState, ClusterState

Enum Constant Summary

Enum Constants

Enum Constant and Description
ACTIVE Initial state of the Node.
PASSIVE Node can go into the PASSIVE when one of the following things happen: When Node.shutdown(boolean) is called, until the shut down process is completed.
SHUT_DOWN After Node.shutdown(boolean) call completes, node's state will be SHUT_DOWN.

Method Summary

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

ACTIVE

public static final NodeState ACTIVE

Initial state of the Node. An ACTIVE node is allowed to execute/process all kinds of operations. A node is in ACTIVE state while cluster state is one of ClusterState.ACTIVE, ClusterState.NO_MIGRATION or ClusterState.FROZEN.

PASSIVE

public static final NodeState PASSIVE

Node can go into the PASSIVE when one of the following things happen:

• When Node.shutdown(boolean) is called, until the shut down process is completed. When the shut down process is completed, node goes into the SHUT_DOWN state.
• When the cluster state moves to ClusterState.PASSIVE via Cluster.changeClusterState(ClusterState)

In PASSIVE state, all operations will be rejected except operations marked as ReadonlyOperation, join operations of some members that are explained in ClusterState, replication / migration operations and heartbeat operations. Operations those are to be allowed during PASSIVE state should be marked as AllowedDuringPassiveState.

SHUT_DOWN

public static final NodeState SHUT_DOWN

After Node.shutdown(boolean) call completes, node's state will be SHUT_DOWN. In SHUT_DOWN state node will be completely inactive. All operations/invocations will be rejected. Once a node is shutdown, it cannot be restarted.

Method Detail

values

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

Returns:

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

valueOf

public static NodeState 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