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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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