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      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_LOCATION_API_ADAPTER_ANDROID_H_
      6 #define CONTENT_BROWSER_GEOLOCATION_LOCATION_API_ADAPTER_ANDROID_H_
      7 
      8 #include "base/android/jni_weak_ref.h"
      9 #include "base/android/scoped_java_ref.h"
     10 #include "base/memory/ref_counted.h"
     11 #include "base/memory/singleton.h"
     12 #include "base/message_loop/message_loop_proxy.h"
     13 #include "base/synchronization/lock.h"
     14 
     15 namespace content {
     16 class LocationProviderAndroid;
     17 struct Geoposition;
     18 
     19 // Interacts with JNI and reports back to AndroidLocationProvider.
     20 // This class creates a LocationProvider java object and listens for
     21 // updates.
     22 // The simplified flow is:
     23 // GeolocationProvider runs in a Geolocation Thread and fetches geolocation data
     24 // from a LocationProvider.
     25 // AndroidLocationProvider access a singleton AndroidLocationApiAdapter
     26 // AndroidLocationApiAdapter calls via JNI and uses the main thread Looper
     27 // in the java side to listen for location updates. We then bounce these updates
     28 // to the Geolocation thread.
     29 // Note that AndroidLocationApiAdapter is a singleton and there's at most only
     30 // one AndroidLocationProvider that has called Start().
     31 class AndroidLocationApiAdapter {
     32  public:
     33   // Starts the underlying location provider, returns true if successful.
     34   // Called on the Geolocation thread.
     35   bool Start(LocationProviderAndroid* location_provider, bool high_accuracy);
     36   // Stops the underlying location provider.
     37   // Called on the Geolocation thread.
     38   void Stop();
     39 
     40   // Returns our singleton.
     41   static AndroidLocationApiAdapter* GetInstance();
     42 
     43   // Called when initializing chrome_view to obtain a pointer to the java class.
     44   static bool RegisterGeolocationService(JNIEnv* env);
     45 
     46   // Called by JNI on main thread looper.
     47   static void OnNewLocationAvailable(double latitude,
     48                                      double longitude,
     49                                      double time_stamp,
     50                                      bool has_altitude, double altitude,
     51                                      bool has_accuracy, double accuracy,
     52                                      bool has_heading, double heading,
     53                                      bool has_speed, double speed);
     54   static void OnNewErrorAvailable(JNIEnv* env, jstring message);
     55 
     56  private:
     57   friend struct DefaultSingletonTraits<AndroidLocationApiAdapter>;
     58   AndroidLocationApiAdapter();
     59   ~AndroidLocationApiAdapter();
     60 
     61   void CreateJavaObject(JNIEnv* env);
     62 
     63   // Called on the JNI main thread looper.
     64   void OnNewGeopositionInternal(const Geoposition& geoposition);
     65 
     66   /// Called on the Geolocation thread.
     67   static void NotifyProviderNewGeoposition(const Geoposition& geoposition);
     68 
     69   base::android::ScopedJavaGlobalRef<jobject>
     70       java_location_provider_android_object_;
     71   LocationProviderAndroid* location_provider_;
     72 
     73   // Guards against the following member which is accessed on Geolocation
     74   // thread and the JNI main thread looper.
     75   base::Lock lock_;
     76   scoped_refptr<base::MessageLoopProxy> message_loop_;
     77 };
     78 
     79 }  // namespace content
     80 
     81 #endif  // CONTENT_BROWSER_GEOLOCATION_LOCATION_API_ADAPTER_ANDROID_H_
     82