/
Node.java
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/
Node.java
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/*
* Copyright 2014-present Open Networking Laboratory
*
* 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 io.atomix.cluster;
import java.net.InetAddress;
/**
* Represents a controller instance as a member in a cluster.
*/
public interface Node {
/**
* Represents the operational state of the instance.
*/
enum State {
/**
* Signifies that the instance is active and that all components are
* operating normally.
*/
READY,
/**
* Signifies that the instance is active and operating normally.
*/
ACTIVE,
/**
* Signifies that the instance is inactive, which means either down or
* up, but not operational.
*/
INACTIVE;
/**
* Indicates whether the state represents node which is active or ready.
*
* @return true if active or ready
*/
public boolean isActive() {
return this == ACTIVE || this == READY;
}
/**
* Indicates whether the state represents a node which is ready.
*
* @return true if active and ready
*/
public boolean isReady() {
return this == READY;
}
}
/**
* Returns the instance identifier.
*
* @return instance identifier
*/
NodeId getNodeId();
/**
* Returns the IP address of the controller instance.
*
* @return IP address
*/
InetAddress getInetAddress();
/**
* Returns the TCP port on which the node listens for connections.
*
* @return TCP port
*/
int getTcpPort();
}