blob: 9e93f6d0d53b65f43d7130cf7e76d82802cd4ca1 [file] [log] [blame]
// 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.
#include "base/android/jni_weak_ref.h"
#include "base/android/scoped_java_ref.h"
#include "base/memory/ref_counted.h"
#include "base/memory/singleton.h"
#include "base/synchronization/lock.h"
namespace base {
class SingleThreadTaskRunner;
namespace device {
class LocationProviderAndroid;
struct Geoposition;
// Interacts with JNI and reports back to LocationProviderAndroid. This class
// creates a LocationProvider java object and listens for updates.
// The simplified flow is:
// - GeolocationProvider runs in a Geolocation Thread and fetches geolocation
// data from a LocationProvider.
// - LocationProviderAndroid accesses a singleton AndroidLocationApiAdapter.
// - AndroidLocationApiAdapter calls via JNI and uses the main thread Looper
// in the java side to listen for location updates. We then bounce these
// updates to the Geolocation thread.
// Note that AndroidLocationApiAdapter is a singleton and there's at most only
// one LocationProviderAndroid that has called Start().
class AndroidLocationApiAdapter {
// Starts the underlying location provider, returns true if successful.
// Called on the Geolocation thread.
bool Start(LocationProviderAndroid* location_provider, bool high_accuracy);
// Stops the underlying location provider.
// Called on the Geolocation thread.
void Stop();
// Returns our singleton.
static AndroidLocationApiAdapter* GetInstance();
// Called when initializing chrome_view to obtain a pointer to the java class.
static bool RegisterGeolocationService(JNIEnv* env);
// Called by JNI on main thread looper.
static void OnNewLocationAvailable(double latitude,
double longitude,
double time_stamp,
bool has_altitude,
double altitude,
bool has_accuracy,
double accuracy,
bool has_heading,
double heading,
bool has_speed,
double speed);
static void OnNewErrorAvailable(JNIEnv* env, jstring message);
friend struct base::DefaultSingletonTraits<AndroidLocationApiAdapter>;
void CreateJavaObject(JNIEnv* env);
// Called on the JNI main thread looper.
void OnNewGeopositionInternal(const Geoposition& geoposition);
/// Called on the Geolocation thread.
static void NotifyProviderNewGeoposition(const Geoposition& geoposition);
// TODO(mvanouwerkerk): Use a callback instead of holding a pointer.
LocationProviderAndroid* location_provider_; // Owned by the arbitrator.
// Guards against the following member which is accessed on Geolocation
// thread and the JNI main thread looper.
base::Lock lock_;
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
} // namespace device