com.hazelcast.instance.NodeState Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2015, Hazelcast, Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.instance;
import com.hazelcast.cluster.ClusterState;
import com.hazelcast.core.Cluster;
import com.hazelcast.spi.ReadonlyOperation;
import com.hazelcast.spi.impl.AllowedDuringPassiveState;
/**
* Possible states of a {@link Node} during its lifecycle.
* Some actions/operations may be allowed or denied
* according to current state of the {@link Node}.
*
* @see Node#start()
* @see Node#shutdown(boolean)
* @see AllowedDuringPassiveState
* @see ClusterState
*
* @since 3.6
*/
public enum NodeState {
/**
* Initial state of the Node. An {@code ACTIVE} node is allowed to execute/process
* all kinds of operations. A node is in {@code ACTIVE} state while cluster state is
* {@link ClusterState#ACTIVE} or {@link ClusterState#FROZEN}.
*/
ACTIVE,
/**
* Node can go into the {@code PASSIVE} when one of the following things happen:
*
* -
* When {@link Node#shutdown(boolean)} is called, until the shut down process is completed.
* When the shut down process is completed, node goes into the {@link NodeState#SHUT_DOWN} state.
*
* -
* When the cluster state moves to {@link ClusterState#PASSIVE} via
* {@link Cluster#changeClusterState(ClusterState)}
*
*
*
* In {@code PASSIVE} state, all operations will be rejected except operations marked as
* {@link ReadonlyOperation}, join operations of some members that are explained in
* {@link ClusterState}, replication / migration operations and heartbeat operations.
* Operations those are to be allowed during {@code PASSIVE} state should be marked as
* {@link AllowedDuringPassiveState}.
*/
PASSIVE,
/**
* After {@link Node#shutdown(boolean)} call completes, node's state will be {@code SHUT_DOWN}.
* In {@code SHUT_DOWN} state node will be completely inactive. All operations/invocations
* will be rejected. Once a node is shutdown, it cannot be restarted.
*/
SHUT_DOWN
}