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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_
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