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/*
 * Copyright 2016-present Open Networking Foundation
 *
 * 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.net.device;

import org.onosproject.net.driver.HandlerBehaviour;

import java.util.List;
import java.util.function.Consumer;

/**
 * Handler behaviour capable of creating device and port descriptions.
 * These descriptions should be appropriately annotated to support downstream
 * projections of the respective devices and their ports.
 */
public interface DeviceDescriptionDiscovery extends HandlerBehaviour {

    /**
     * Returns a device description appropriately annotated to support
     * downstream model extension via projections of the resulting device,
     * as in the following example.
     *      * MicrowaveDevice device = deviceService.get(id).as(MicrowaveDevice.class);
     * 
     *
     * @return annotated device description
     */
    DeviceDescription discoverDeviceDetails();

    /**
     * Returns a list of port descriptions appropriately annotated to support
     * downstream model extension via projections of their parent device,
     * as in the following example.
     *      * MicrowaveDevice device = deviceService.get(id).as(MicrowaveDevice.class);
     * List<MicrowavePort> ports = device.microwavePorts(deviceService.getPorts(id));
     * 
     *
     * @return annotated device description
     */
    List discoverPortDetails();

    /**
     * Invoke given lamda function when port descriptions are discovered.
     *
     * @param consumer consumer to process port description
     */
    default void discoverPortDetails(Consumer consumer) {
        throw new UnsupportedOperationException("Need to be implemented by subclass");
    }
}