Index: content/browser/geolocation/wifi_data_provider.h |
diff --git a/content/browser/geolocation/wifi_data_provider.h b/content/browser/geolocation/wifi_data_provider.h |
new file mode 100644 |
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+++ b/content/browser/geolocation/wifi_data_provider.h |
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+// Copyright 2013 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. |
+ |
+#ifndef CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_PROVIDER_H_ |
+#define CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_PROVIDER_H_ |
+ |
+#include <set> |
+ |
+#include "base/callback_forward.h" |
+#include "base/macros.h" |
+#include "base/memory/ref_counted.h" |
+#include "base/single_thread_task_runner.h" |
+#include "content/browser/geolocation/wifi_data.h" |
+#include "content/common/content_export.h" |
+ |
+namespace content { |
+ |
+class CONTENT_EXPORT WifiDataProvider |
+ : public base::RefCountedThreadSafe<WifiDataProvider> { |
+ public: |
+ WifiDataProvider(); |
+ |
+ // Tells the provider to start looking for data. Callbacks will start |
+ // receiving notifications after this call. |
+ virtual void StartDataProvider() = 0; |
+ |
+ // Tells the provider to stop looking for data. Callbacks will stop |
+ // receiving notifications after this call. |
+ virtual void StopDataProvider() = 0; |
+ |
+ // Provides whatever data the provider has, which may be nothing. Return |
+ // value indicates whether this is all the data the provider could ever |
+ // obtain. |
+ virtual bool GetData(WifiData* data) = 0; |
+ |
+ typedef base::Closure WifiDataUpdateCallback; |
+ |
+ void AddCallback(WifiDataUpdateCallback* callback); |
+ |
+ bool RemoveCallback(WifiDataUpdateCallback* callback); |
+ |
+ bool has_callbacks() const; |
+ |
+ protected: |
+ friend class base::RefCountedThreadSafe<WifiDataProvider>; |
+ virtual ~WifiDataProvider(); |
+ |
+ typedef std::set<WifiDataUpdateCallback*> CallbackSet; |
+ |
+ // Runs all callbacks via a posted task, so we can unwind callstack here and |
+ // avoid client reentrancy. |
+ void RunCallbacks(); |
+ |
+ bool CalledOnClientThread() const; |
+ |
+ scoped_refptr<base::SingleThreadTaskRunner> client_task_runner() const { |
+ return client_task_runner_; |
+ } |
+ |
+ private: |
+ void DoRunCallbacks(); |
+ |
+ // The task runner for the client thread, all callbacks should run on it. |
+ scoped_refptr<base::SingleThreadTaskRunner> client_task_runner_; |
+ |
+ CallbackSet callbacks_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(WifiDataProvider); |
+}; |
+ |
+} // namespace content |
+ |
+#endif // CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_PROVIDER_H_ |