/*
 * Copyright 2014 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 org.onosproject.cluster;

import org.onlab.packet.IpAddress;

/**
 * Represents a controller instance as a member in a cluster.
 */
public interface ControllerNode {

    /** 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 id();

    /**
     * Returns the IP address of the controller instance.
     *
     * @return IP address
     */
    IpAddress ip();


    /**
     * Returns the TCP port on which the node listens for connections.
     *
     * @return TCP port
     */
    int tcpPort();

}