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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 CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_PROVIDER_H_ |
| 6 #define CONTENT_BROWSER_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 "content/browser/geolocation/wifi_data.h" |
| 15 #include "content/common/content_export.h" |
| 16 |
| 17 namespace content { |
| 18 |
| 19 class CONTENT_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 content |
| 73 |
| 74 #endif // CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_PROVIDER_H_ |
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