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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 SERVICES_DEVICE_GEOLOCATION_WIFI_DATA_PROVIDER_H_
- #define SERVICES_DEVICE_GEOLOCATION_WIFI_DATA_PROVIDER_H_
- #include <set>
- #include "base/callback_forward.h"
- #include "base/memory/ref_counted.h"
- #include "base/memory/weak_ptr.h"
- #include "base/task/single_thread_task_runner.h"
- #include "services/device/geolocation/wifi_data.h"
- namespace device {
- class WifiDataProvider : public base::RefCountedThreadSafe<WifiDataProvider> {
- public:
- WifiDataProvider();
- WifiDataProvider(const WifiDataProvider&) = delete;
- WifiDataProvider& operator=(const WifiDataProvider&) = delete;
- // 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;
- // Returns true if the provider is delayed due to scanning policy.
- virtual bool DelayedByPolicy() = 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;
- virtual void ForceRescan() = 0;
- typedef base::RepeatingClosure WifiDataUpdateCallback;
- void AddCallback(WifiDataUpdateCallback* callback);
- bool RemoveCallback(WifiDataUpdateCallback* callback);
- bool has_callbacks() const;
- base::WeakPtr<WifiDataProvider> GetWeakPtr() {
- return weak_factory_.GetWeakPtr();
- }
- 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_;
- base::WeakPtrFactory<WifiDataProvider> weak_factory_{this};
- };
- } // namespace device
- #endif // SERVICES_DEVICE_GEOLOCATION_WIFI_DATA_PROVIDER_H_
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