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| 1 // Copyright 2013 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_WIFI_DATA_PROVIDER_H_ | |
| 6 #define DEVICE_GEOLOCATION_WIFI_DATA_PROVIDER_H_ | |
| 7 | |
| 8 #include <set> | |
| 9 | |
| 10 #include "base/callback_forward.h" | |
| 11 #include "base/macros.h" | |
| 12 #include "base/memory/ref_counted.h" | |
| 13 #include "base/single_thread_task_runner.h" | |
| 14 #include "device/geolocation/geolocation_export.h" | |
| 15 #include "device/geolocation/wifi_data.h" | |
| 16 | |
| 17 namespace device { | |
| 18 | |
| 19 class DEVICE_GEOLOCATION_EXPORT WifiDataProvider | |
| 20 : public base::RefCountedThreadSafe<WifiDataProvider> { | |
| 21 public: | |
| 22 WifiDataProvider(); | |
| 23 | |
| 24 // Tells the provider to start looking for data. Callbacks will start | |
| 25 // receiving notifications after this call. | |
| 26 virtual void StartDataProvider() = 0; | |
| 27 | |
| 28 // Tells the provider to stop looking for data. Callbacks will stop | |
| 29 // receiving notifications after this call. | |
| 30 virtual void StopDataProvider() = 0; | |
| 31 | |
| 32 // Provides whatever data the provider has, which may be nothing. Return | |
| 33 // value indicates whether this is all the data the provider could ever | |
| 34 // obtain. | |
| 35 virtual bool GetData(WifiData* data) = 0; | |
| 36 | |
| 37 typedef base::Closure WifiDataUpdateCallback; | |
| 38 | |
| 39 void AddCallback(WifiDataUpdateCallback* callback); | |
| 40 | |
| 41 bool RemoveCallback(WifiDataUpdateCallback* callback); | |
| 42 | |
| 43 bool has_callbacks() const; | |
| 44 | |
| 45 protected: | |
| 46 friend class base::RefCountedThreadSafe<WifiDataProvider>; | |
| 47 virtual ~WifiDataProvider(); | |
| 48 | |
| 49 typedef std::set<WifiDataUpdateCallback*> CallbackSet; | |
| 50 | |
| 51 // Runs all callbacks via a posted task, so we can unwind callstack here and | |
| 52 // avoid client reentrancy. | |
| 53 void RunCallbacks(); | |
| 54 | |
| 55 bool CalledOnClientThread() const; | |
| 56 | |
| 57 scoped_refptr<base::SingleThreadTaskRunner> client_task_runner() const { | |
| 58 return client_task_runner_; | |
| 59 } | |
| 60 | |
| 61 private: | |
| 62 void DoRunCallbacks(); | |
| 63 | |
| 64 // The task runner for the client thread, all callbacks should run on it. | |
| 65 scoped_refptr<base::SingleThreadTaskRunner> client_task_runner_; | |
| 66 | |
| 67 CallbackSet callbacks_; | |
| 68 | |
| 69 DISALLOW_COPY_AND_ASSIGN(WifiDataProvider); | |
| 70 }; | |
| 71 | |
| 72 } // namespace device | |
| 73 | |
| 74 #endif // DEVICE_GEOLOCATION_WIFI_DATA_PROVIDER_H_ | |
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Chromium Code Reviews
Issue 2192683003:
Revert of Reland: Geolocation: move from content/browser to device/ (patchset #2 id:20001 of https:… (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@2810