/*
 * 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.onlab.onos.openflow.controller;

import org.projectfloodlight.openflow.protocol.OFPortStatus;

/**
 * Allows for providers interested in Switch events to be notified.
 */
public interface OpenFlowSwitchListener {

    /**
     * Notify that the switch was added.
     * @param dpid the switch where the event occurred
     */
    public void switchAdded(Dpid dpid);

    /**
     * Notify that the switch was removed.
     * @param dpid the switch where the event occurred.
     */
    public void switchRemoved(Dpid dpid);

    /**
     * Notify that the switch has changed in some way.
     * @param dpid the switch that changed
     */
    public void switchChanged(Dpid dpid);

    /**
     * Notify that a port has changed.
     * @param dpid the switch on which the change happened.
     * @param status the new state of the port.
     */
    public void portChanged(Dpid dpid, OFPortStatus status);

    /**
     * Notify that a role imposed on a switch failed to take hold.
     *
     * @param dpid the switch that failed role assertion
     * @param role the role imposed by the controller
     */
    public void roleAssertFailed(Dpid dpid, RoleState role);
}