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1 // Copyright 2016 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 SensorPollingStrategy_h | |
6 #define SensorPollingStrategy_h | |
7 | |
8 #include "device/generic_sensor/public/interfaces/sensor_provider.mojom-blink.h" | |
9 #include "platform/Timer.h" | |
10 #include "platform/heap/Handle.h" | |
11 #include "wtf/Functional.h" | |
12 | |
13 namespace blink { | |
14 | |
15 // This class provides different polling behaviour depending on | |
16 // the given 'ReportingMode': | |
17 // - for 'CONTINUOUS' mode the polling function is invoked periodically | |
18 // with the given polling period (on timer event). | |
19 // - for 'ONCHANGE' mode the polling function is invoked only after client | |
20 // calls 'onSensorReadingChanged()' however considering the given polling | |
21 // period: guaranteed not to be called more often than expected. | |
22 class SensorPollingStrategy { | |
23 public: | |
24 static std::unique_ptr<SensorPollingStrategy> create( | |
25 double pollingPeriod, | |
26 std::unique_ptr<Function<void()>> pollFunc, | |
27 device::mojom::blink::ReportingMode); | |
28 | |
29 virtual void onSensorReadingChanged() {} | |
30 virtual void startPolling() = 0; | |
31 virtual void stopPolling() = 0; | |
32 | |
33 virtual ~SensorPollingStrategy(); | |
34 | |
35 protected: | |
36 SensorPollingStrategy(double pollingPeriod, | |
37 std::unique_ptr<Function<void()>>); | |
38 virtual void pollForData(TimerBase*) = 0; | |
39 | |
40 double m_pollingPeriod; | |
41 std::unique_ptr<Function<void()>> m_pollFunc; | |
42 Timer<SensorPollingStrategy> m_timer; | |
43 }; | |
44 | |
45 } // namespace blink | |
46 | |
47 #endif // SensorPollingStrategy_h | |
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