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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 DEVICE_GEOLOCATION_LOCATION_API_ADAPTER_ANDROID_H_ | |
6 #define DEVICE_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/synchronization/lock.h" | |
13 | |
14 namespace base { | |
15 class SingleThreadTaskRunner; | |
16 } | |
17 | |
18 namespace device { | |
19 class LocationProviderAndroid; | |
20 struct Geoposition; | |
21 | |
22 // Interacts with JNI and reports back to LocationProviderAndroid. This class | |
23 // creates a LocationProvider java object and listens for updates. | |
24 // The simplified flow is: | |
25 // - GeolocationProvider runs in a Geolocation Thread and fetches geolocation | |
26 // data from a LocationProvider. | |
27 // - LocationProviderAndroid accesses a singleton AndroidLocationApiAdapter. | |
28 // - AndroidLocationApiAdapter calls via JNI and uses the main thread Looper | |
29 // in the java side to listen for location updates. We then bounce these | |
30 // updates to the Geolocation thread. | |
31 // | |
32 // Note that AndroidLocationApiAdapter is a singleton and there's at most only | |
33 // one LocationProviderAndroid that has called Start(). | |
34 class AndroidLocationApiAdapter { | |
35 public: | |
36 // Starts the underlying location provider, returns true if successful. | |
37 // Called on the Geolocation thread. | |
38 bool Start(LocationProviderAndroid* location_provider, bool high_accuracy); | |
39 // Stops the underlying location provider. | |
40 // Called on the Geolocation thread. | |
41 void Stop(); | |
42 | |
43 // Returns our singleton. | |
44 static AndroidLocationApiAdapter* GetInstance(); | |
45 | |
46 // Called when initializing chrome_view to obtain a pointer to the java class. | |
47 static bool RegisterGeolocationService(JNIEnv* env); | |
48 | |
49 // Called by JNI on main thread looper. | |
50 static void OnNewLocationAvailable(double latitude, | |
51 double longitude, | |
52 double time_stamp, | |
53 bool has_altitude, double altitude, | |
54 bool has_accuracy, double accuracy, | |
55 bool has_heading, double heading, | |
56 bool has_speed, double speed); | |
57 static void OnNewErrorAvailable(JNIEnv* env, jstring message); | |
58 | |
59 private: | |
60 friend struct base::DefaultSingletonTraits<AndroidLocationApiAdapter>; | |
61 AndroidLocationApiAdapter(); | |
62 ~AndroidLocationApiAdapter(); | |
63 | |
64 void CreateJavaObject(JNIEnv* env); | |
65 | |
66 // Called on the JNI main thread looper. | |
67 void OnNewGeopositionInternal(const Geoposition& geoposition); | |
68 | |
69 /// Called on the Geolocation thread. | |
70 static void NotifyProviderNewGeoposition(const Geoposition& geoposition); | |
71 | |
72 base::android::ScopedJavaGlobalRef<jobject> | |
73 java_location_provider_android_object_; | |
74 // TODO(mvanouwerkerk): Use a callback instead of holding a pointer. | |
75 LocationProviderAndroid* location_provider_; // Owned by the arbitrator. | |
76 | |
77 // Guards against the following member which is accessed on Geolocation | |
78 // thread and the JNI main thread looper. | |
79 base::Lock lock_; | |
80 scoped_refptr<base::SingleThreadTaskRunner> task_runner_; | |
81 }; | |
82 | |
83 } // namespace device | |
84 | |
85 #endif // DEVICE_GEOLOCATION_LOCATION_API_ADAPTER_ANDROID_H_ | |
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