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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_PROVIDER_IMPL_H_
#define CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_PROVIDER_IMPL_H_
#include <list>
#include <vector>
#include "base/basictypes.h"
#include "base/callback_forward.h"
#include "base/compiler_specific.h"
#include "base/threading/thread.h"
#include "content/common/content_export.h"
#include "content/public/browser/geolocation_provider.h"
#include "content/public/common/geoposition.h"
template<typename Type> struct DefaultSingletonTraits;
namespace content {
class GeolocationArbitrator;
class GeolocationProviderTest;
// 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 unregistered by RemoveLocationUpdateCallback().
// The application must instantiate the GeolocationProvider on the IO 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. The arbitrator and the
// location providers it uses run on a separate Geolocation thread.
class CONTENT_EXPORT GeolocationProviderImpl
: public NON_EXPORTED_BASE(GeolocationProvider),
public base::Thread {
public:
// GeolocationProvider implementation:
virtual void AddLocationUpdateCallback(const LocationUpdateCallback& callback,
bool use_high_accuracy) OVERRIDE;
virtual bool RemoveLocationUpdateCallback(
const LocationUpdateCallback& callback) OVERRIDE;
virtual void UserDidOptIntoLocationServices() OVERRIDE;
bool LocationServicesOptedIn() const;
// Overrides the location for automation/testing. Suppresses any further
// updates from the actual providers and sends an update with the overridden
// position to all registered clients.
void OverrideLocationForTesting(const Geoposition& override_position);
// Callback from the GeolocationArbitrator. Public for testing.
void OnLocationUpdate(const Geoposition& position);
// Gets a pointer to the singleton instance of the location relayer, which
// is in turn bound to the browser's global context objects. This must only be
// called on the IO thread so that the GeolocationProviderImpl is always
// instantiated on the same thread. Ownership is NOT returned.
static GeolocationProviderImpl* GetInstance();
protected:
friend struct DefaultSingletonTraits<GeolocationProviderImpl>;
GeolocationProviderImpl();
virtual ~GeolocationProviderImpl();
// Useful for injecting mock geolocation arbitrator in tests.
virtual GeolocationArbitrator* CreateArbitrator();
private:
typedef std::pair<LocationUpdateCallback, bool> LocationUpdateInfo;
typedef std::list<LocationUpdateInfo> CallbackList;
bool OnGeolocationThread() const;
// Start and stop providers as needed when clients are added or removed.
void OnClientsChanged();
// Stops the providers when there are no more registered clients. Note that
// once the Geolocation thread is started, it will stay alive (but sitting
// idle without any pending messages).
void StopProviders();
// Starts the geolocation providers or updates their options (delegates to
// arbitrator).
void StartProviders(bool use_high_accuracy);
// Updates the providers on the geolocation thread, which must be running.
void InformProvidersPermissionGranted();
// Notifies all registered clients that a position update is available.
void NotifyClients(const Geoposition& position);
// Thread
virtual void Init() OVERRIDE;
virtual void CleanUp() OVERRIDE;
// Only used on the IO thread
CallbackList callbacks_;
bool user_did_opt_into_location_services_;
Geoposition position_;
// True only in testing, where we want to use a custom position.
bool ignore_location_updates_;
// Only to be used on the geolocation thread.
GeolocationArbitrator* arbitrator_;
DISALLOW_COPY_AND_ASSIGN(GeolocationProviderImpl);
};
} // namespace content
#endif // CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_PROVIDER_IMPL_H_
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