Refactor GeofencingManager to have one instance per StoragePartition.

content/browser/geofencing/geofencing_service.h

+// Copyright 2014 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_GEOFENCING_GEOFENCING_SERVICE_H_
+#define CONTENT_BROWSER_GEOFENCING_GEOFENCING_SERVICE_H_
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/common/content_export.h"
+#include "content/common/geofencing_status.h"
+
+template <typename T>
+struct DefaultSingletonTraits;
+
+namespace blink {
+struct WebCircularGeofencingRegion;
+};
+
+namespace content {
+
+class GeofencingProvider;
+class GeofencingRegistrationDelegate;
+
+// This interface exists primarily to facilitate testing of classes that depend
+// on GeofencingService. It defines the interface exposed by
+// |GeofencingService|.
+class GeofencingService {
+ public:
+  virtual ~GeofencingService() {}
+
+  // Returns if a geofencing service is available.
+  virtual bool IsServiceAvailable() = 0;
+
+  // Register a region. This returns a unique registration ID, and
+  // asynchronously calls the |delegate|s RegistrationFinished method to
+  // inform the delegate of the result of the attempt to register the region.
+  // This does not transfer ownership of the |delegate|. Callers have to ensure
+  // that the delegate remains valid as long as the region is registered.
+  virtual int64 RegisterRegion(const blink::WebCircularGeofencingRegion& region,
+                               GeofencingRegistrationDelegate* delegate) = 0;
+
+  // Unregister a region. This is assumed to always succeed. It is safe to call
+  // this even if a registration is still in progress.
+  virtual void UnregisterRegion(int64 geofencing_registration_id) = 0;
+};
+
+// This class combines all the geofence registrations from the various per
+// storage partition |GeofencingManager| instances, and registers a subset
+// of those fences with an underlying platform specific |GeofencingProvider|.
+// TODO(mek): Limit the number of geofences that are registered with the
+// underlying GeofencingProvider.
+class CONTENT_EXPORT GeofencingServiceImpl
+    : NON_EXPORTED_BASE(public GeofencingService) {
+ public:
+  // Gets a pointer to the singleton instance of the geofencing service. This
+  // must only be called on the IO thread so that the GeofencingService is
+  // always instantiated on the same thread. Ownership is NOT returned.
+  static GeofencingServiceImpl* GetInstance();
+
+  // GeofencingServiceInterface implementation.
+  bool IsServiceAvailable() override;
+  int64 RegisterRegion(
+      const blink::WebCircularGeofencingRegion& region,
+      GeofencingRegistrationDelegate* delegate) override;
+  void UnregisterRegion(int64 geofencing_registration_id) override;
+
+ protected:
+  friend class GeofencingServiceTest;
+  friend struct DefaultSingletonTraits<GeofencingServiceImpl>;
+  GeofencingServiceImpl();
+  ~GeofencingServiceImpl() override;
+
+  void SetProviderForTesting(scoped_ptr<GeofencingProvider> provider);
+  int RegistrationCountForTesting();
+
+ private:
+  struct Registration;
+  typedef std::map<int64, Registration> RegistrationsMap;
+
+  // This method checks if a |GeofencingProvider| exists, creates a new one if
+  // not, and finally returns false if it can't create a provider for the
+  // current platform.
+  bool EnsureProvider();
+
+  // Returns a new unique ID to use for the next geofence registration.
+  int64 GetNextId();
+
+  // Notifies the correct delegate that registration has completed for a
+  // specific geofence registration.
+  void NotifyRegistrationFinished(int64 geofencing_registration_id,
+                                  GeofencingStatus status);
+
+  int64 next_registration_id_;
+  RegistrationsMap registrations_;
+  scoped_ptr<GeofencingProvider> provider_;
+
+  DISALLOW_COPY_AND_ASSIGN(GeofencingServiceImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_GEOFENCING_GEOFENCING_SERVICE_H_