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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_ARBITRATOR_IMPL_H_ | |
6 #define CONTENT_BROWSER_GEOLOCATION_LOCATION_ARBITRATOR_IMPL_H_ | |
7 | |
8 #include <stdint.h> | |
9 #include <vector> | |
10 | |
11 #include "base/callback_forward.h" | |
12 #include "base/cancelable_callback.h" | |
13 #include "base/macros.h" | |
14 #include "base/memory/scoped_vector.h" | |
15 #include "base/strings/string16.h" | |
16 #include "base/time/time.h" | |
17 #include "content/browser/geolocation/location_arbitrator.h" | |
18 #include "content/common/content_export.h" | |
19 #include "content/public/browser/access_token_store.h" | |
20 #include "content/public/browser/geolocation_provider.h" | |
21 #include "content/public/browser/location_provider.h" | |
22 #include "content/public/common/geoposition.h" | |
23 #include "net/url_request/url_request_context_getter.h" | |
24 | |
25 namespace net { | |
26 class URLRequestContextGetter; | |
27 } | |
28 | |
29 namespace content { | |
30 class AccessTokenStore; | |
31 class GeolocationDelegate; | |
32 class LocationProvider; | |
33 | |
34 // This class is responsible for handling updates from multiple underlying | |
35 // providers and resolving them to a single 'best' location fix at any given | |
36 // moment. | |
37 class CONTENT_EXPORT LocationArbitratorImpl : public LocationArbitrator { | |
38 public: | |
39 // Number of milliseconds newer a location provider has to be that it's worth | |
40 // switching to this location provider on the basis of it being fresher | |
41 // (regardles of relative accuracy). Public for tests. | |
42 static const int64_t kFixStaleTimeoutMilliseconds; | |
43 | |
44 typedef base::Callback<void(const Geoposition&)> LocationUpdateCallback; | |
45 | |
46 LocationArbitratorImpl(const LocationUpdateCallback& callback, | |
47 GeolocationDelegate* delegate); | |
48 ~LocationArbitratorImpl() override; | |
49 | |
50 static GURL DefaultNetworkProviderURL(); | |
51 | |
52 // LocationArbitrator | |
53 void StartProviders(bool enable_high_accuracy) override; | |
54 void StopProviders() override; | |
55 void OnPermissionGranted() override; | |
56 bool HasPermissionBeenGranted() const override; | |
57 | |
58 protected: | |
59 // These functions are useful for injection of dependencies in derived | |
60 // testing classes. | |
61 virtual scoped_refptr<AccessTokenStore> NewAccessTokenStore(); | |
62 virtual std::unique_ptr<LocationProvider> NewNetworkLocationProvider( | |
63 const scoped_refptr<AccessTokenStore>& access_token_store, | |
64 const scoped_refptr<net::URLRequestContextGetter>& context, | |
65 const GURL& url, | |
66 const base::string16& access_token); | |
67 virtual std::unique_ptr<LocationProvider> NewSystemLocationProvider(); | |
68 virtual base::Time GetTimeNow() const; | |
69 | |
70 private: | |
71 friend class TestingLocationArbitrator; | |
72 | |
73 scoped_refptr<AccessTokenStore> GetAccessTokenStore(); | |
74 | |
75 // Provider will either be added to |providers_| or | |
76 // deleted on error (e.g. it fails to start). | |
77 void RegisterProvider(std::unique_ptr<LocationProvider> provider); | |
78 | |
79 void RegisterSystemProvider(); | |
80 void OnAccessTokenStoresLoaded( | |
81 AccessTokenStore::AccessTokenMap access_token_map, | |
82 const scoped_refptr<net::URLRequestContextGetter>& context_getter); | |
83 void DoStartProviders(); | |
84 | |
85 // Gets called when a provider has a new position. | |
86 void OnLocationUpdate(const LocationProvider* provider, | |
87 const Geoposition& new_position); | |
88 | |
89 // Returns true if |new_position| is an improvement over |old_position|. | |
90 // Set |from_same_provider| to true if both the positions came from the same | |
91 // provider. | |
92 bool IsNewPositionBetter(const Geoposition& old_position, | |
93 const Geoposition& new_position, | |
94 bool from_same_provider) const; | |
95 | |
96 GeolocationDelegate* delegate_; | |
97 | |
98 scoped_refptr<AccessTokenStore> access_token_store_; | |
99 LocationUpdateCallback arbitrator_update_callback_; | |
100 LocationProvider::LocationProviderUpdateCallback provider_update_callback_; | |
101 | |
102 // The CancelableCallback will prevent OnAccessTokenStoresLoaded from being | |
103 // called multiple times by calling Reset() at the time of binding. | |
104 base::CancelableCallback<void( | |
105 AccessTokenStore::AccessTokenMap, | |
106 const scoped_refptr<net::URLRequestContextGetter>&)> | |
107 token_store_callback_; | |
108 std::vector<std::unique_ptr<LocationProvider>> providers_; | |
109 bool enable_high_accuracy_; | |
110 // The provider which supplied the current |position_| | |
111 const LocationProvider* position_provider_; | |
112 bool is_permission_granted_; | |
113 // The current best estimate of our position. | |
114 Geoposition position_; | |
115 | |
116 // Tracks whether providers should be running. | |
117 bool is_running_; | |
118 | |
119 DISALLOW_COPY_AND_ASSIGN(LocationArbitratorImpl); | |
120 }; | |
121 | |
122 // Factory functions for the various types of location provider to abstract | |
123 // over the platform-dependent implementations. | |
124 std::unique_ptr<LocationProvider> NewSystemLocationProvider(); | |
125 | |
126 } // namespace content | |
127 | |
128 #endif // CONTENT_BROWSER_GEOLOCATION_LOCATION_ARBITRATOR_IMPL_H_ | |
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