content/browser/geolocation/geolocation_provider_impl.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_PROVIDER_IMPL_H_
   6 #define CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_PROVIDER_IMPL_H_
   7
   8 #include <list>
   9 #include <vector>
  10
  11 #include "base/basictypes.h"
  12 #include "base/callback_forward.h"
  13 #include "base/compiler_specific.h"
  14 #include "base/threading/thread.h"
  15 #include "content/common/content_export.h"
  16 #include "content/public/browser/geolocation_provider.h"
  17 #include "content/public/common/geoposition.h"
  18
  19 template<typename Type> struct DefaultSingletonTraits;
  20
  21 namespace content {
  22 class LocationArbitrator;
  23
  24 class CONTENT_EXPORT GeolocationProviderImpl
  25     : public NON_EXPORTED_BASE(GeolocationProvider),
  26       public base::Thread {
  27  public:
  28   // GeolocationProvider implementation:
  29   virtual scoped_ptr<GeolocationProvider::Subscription>
  30       AddLocationUpdateCallback(const LocationUpdateCallback& callback,
  31                                 bool use_high_accuracy) OVERRIDE;
  32   virtual void UserDidOptIntoLocationServices() OVERRIDE;
  33   virtual void OverrideLocationForTesting(const Geoposition& position) OVERRIDE;
  34
  35   // Callback from the LocationArbitrator. Public for testing.
  36   void OnLocationUpdate(const Geoposition& position);
  37
  38   // Gets a pointer to the singleton instance of the location relayer, which
  39   // is in turn bound to the browser's global context objects. This must only be
  40   // called on the IO thread so that the GeolocationProviderImpl is always
  41   // instantiated on the same thread. Ownership is NOT returned.
  42   static GeolocationProviderImpl* GetInstance();
  43
  44   bool user_did_opt_into_location_services_for_testing() {
  45     return user_did_opt_into_location_services_;
  46   }
  47
  48  protected:
  49   friend struct DefaultSingletonTraits<GeolocationProviderImpl>;
  50   GeolocationProviderImpl();
  51   virtual ~GeolocationProviderImpl();
  52
  53   // Useful for injecting mock geolocation arbitrator in tests.
  54   virtual LocationArbitrator* CreateArbitrator();
  55
  56  private:
  57   bool OnGeolocationThread() const;
  58
  59   // Start and stop providers as needed when clients are added or removed.
  60   void OnClientsChanged();
  61
  62   // Stops the providers when there are no more registered clients. Note that
  63   // once the Geolocation thread is started, it will stay alive (but sitting
  64   // idle without any pending messages).
  65   void StopProviders();
  66
  67   // Starts the geolocation providers or updates their options (delegates to
  68   // arbitrator).
  69   void StartProviders(bool use_high_accuracy);
  70
  71   // Updates the providers on the geolocation thread, which must be running.
  72   void InformProvidersPermissionGranted();
  73
  74   // Notifies all registered clients that a position update is available.
  75   void NotifyClients(const Geoposition& position);
  76
  77   // Thread
  78   virtual void Init() OVERRIDE;
  79   virtual void CleanUp() OVERRIDE;
  80
  81   base::CallbackList<void(const Geoposition&)> high_accuracy_callbacks_;
  82   base::CallbackList<void(const Geoposition&)> low_accuracy_callbacks_;
  83
  84   bool user_did_opt_into_location_services_;
  85   Geoposition position_;
  86
  87   // True only in testing, where we want to use a custom position.
  88   bool ignore_location_updates_;
  89
  90   // Only to be used on the geolocation thread.
  91   LocationArbitrator* arbitrator_;
  92
  93   DISALLOW_COPY_AND_ASSIGN(GeolocationProviderImpl);
  94 };
  95
  96 }  // namespace content
  97
  98 #endif  // CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_PROVIDER_IMPL_H_