/*! Copyright (c) 2018 Siemens AG. Licensed under the MIT License. */
import { Observable } from "rxjs";
import { Controller, Uuid } from "..";
import { Thing } from "./objects";
/**
 * Observes Things and Thing-related objects.
 *
 * This controller is designed to be used by a client with a corresponding
 * controller (e.g. ThingSourceController) that answers to its events.
 */
export declare class ThingObserverController extends Controller {
    /**
     * Returns an observable of the Things in the system.
     *
     * This is performed by sending a Discovery event with the object type of
     * Thing.
     *
     * This method does not perform any kind of caching and it should be
     * performed on the application-side.
     */
    discoverThings(): Observable<Thing>;
    /**
     * Returns an observable emitting advertised Things.
     *
     * This method does not perform any kind of caching and it should be
     * performed on the application-side.
     */
    observeAdvertisedThings(): Observable<Thing>;
    /**
     * Returns an observable of the Things that are located at the given
     * Location.
     *
     * This is performed by sending a Query event for Thing objects with the
     * locationId matching the objectId of the Location.
     *
     * This method does not perform any kind of caching and it should be
     * performed on the application-side.
     */
    queryThingsAtLocation(locationId: Uuid): Observable<Thing[]>;
}