chromium/services/device/geolocation/geolocation_provider.h

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SERVICES_DEVICE_GEOLOCATION_GEOLOCATION_PROVIDER_H_
#define SERVICES_DEVICE_GEOLOCATION_GEOLOCATION_PROVIDER_H_

#include "base/callback_list.h"
#include "services/device/public/mojom/geoposition.mojom.h"

namespace device {

// This is the main API to the geolocation subsystem. The application will hold
// a single instance of this class and can register multiple clients to be
// notified of location changes:
// * Callbacks are registered by AddLocationUpdateCallback() and will keep
//   receiving updates until the returned subscription object is destroyed.
// The application must instantiate the GeolocationProvider on the UI thread and
// must communicate with it on the same thread.
// The underlying location arbitrator will only be enabled whilst there is at
// least one registered observer or pending callback (and only after
// mojom::UserDidOptIntoLocationServices() which is implemented by
// GeolocationProviderImpl). The arbitrator and the location providers it uses
// run on a separate Geolocation thread.
// TODO([email protected]): With the proceeding of the servicification of
// geolocation, the geolocation core will be moved into //services/device and as
// a internal part of Device Service. This geolocation_provider.h will also be
// removed.
class GeolocationProvider { … };

}  // namespace device

#endif  // SERVICES_DEVICE_GEOLOCATION_GEOLOCATION_PROVIDER_H_