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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 #include "modules/sensor/SensorPollingStrategy.h" |
| 6 |
| 7 #include "platform/Timer.h" |
| 8 #include "wtf/CurrentTime.h" |
| 9 |
| 10 namespace blink { |
| 11 |
| 12 SensorPollingStrategy::SensorPollingStrategy(double frequency, std::unique_ptr<F
unction<void()>> func) |
| 13 : m_frequency(frequency) |
| 14 , m_pollFunc(std::move(func)) |
| 15 { |
| 16 } |
| 17 |
| 18 class ContiniousSensorPollingStrategy : public SensorPollingStrategy { |
| 19 public: |
| 20 DEFINE_INLINE_VIRTUAL_TRACE() |
| 21 { |
| 22 SensorPollingStrategy::trace(visitor); |
| 23 } |
| 24 |
| 25 ContiniousSensorPollingStrategy(double frequency, std::unique_ptr<Function<v
oid()>> func) |
| 26 : SensorPollingStrategy(frequency, std::move(func)) |
| 27 , m_timer(this, &ContiniousSensorPollingStrategy::pollForData) {} |
| 28 private: |
| 29 // SensorPollingStrategy overrides. |
| 30 void startPolling() override; |
| 31 void stopPolling() override; |
| 32 |
| 33 void pollForData(TimerBase*); |
| 34 |
| 35 Timer<ContiniousSensorPollingStrategy> m_timer; |
| 36 }; |
| 37 |
| 38 void ContiniousSensorPollingStrategy::startPolling() |
| 39 { |
| 40 m_timer.startRepeating(1 / m_frequency, BLINK_FROM_HERE); |
| 41 } |
| 42 |
| 43 void ContiniousSensorPollingStrategy::stopPolling() |
| 44 { |
| 45 m_timer.stop(); |
| 46 } |
| 47 |
| 48 void ContiniousSensorPollingStrategy::pollForData(TimerBase*) |
| 49 { |
| 50 (*m_pollFunc)(); |
| 51 } |
| 52 |
| 53 class OnChangeSensorPollingStrategy : public SensorPollingStrategy { |
| 54 public: |
| 55 DEFINE_INLINE_VIRTUAL_TRACE() |
| 56 { |
| 57 SensorPollingStrategy::trace(visitor); |
| 58 } |
| 59 |
| 60 OnChangeSensorPollingStrategy(double frequency, std::unique_ptr<Function<voi
d()>> func) |
| 61 : SensorPollingStrategy(frequency, std::move(func)) |
| 62 , m_timer(this, &OnChangeSensorPollingStrategy::pollForData) |
| 63 , m_polling(false) |
| 64 , m_lastPollingTimestamp(0.0) {} |
| 65 private: |
| 66 // SensorPollingStrategy overrides. |
| 67 void startPolling() override; |
| 68 void stopPolling() override; |
| 69 void onSensorReadingChanged() override; |
| 70 |
| 71 void pollForData(TimerBase*); |
| 72 |
| 73 Timer<OnChangeSensorPollingStrategy> m_timer; |
| 74 bool m_polling; |
| 75 double m_lastPollingTimestamp; |
| 76 }; |
| 77 |
| 78 void OnChangeSensorPollingStrategy::startPolling() |
| 79 { |
| 80 m_polling = true; |
| 81 } |
| 82 |
| 83 void OnChangeSensorPollingStrategy::stopPolling() |
| 84 { |
| 85 m_polling = false; |
| 86 } |
| 87 |
| 88 void OnChangeSensorPollingStrategy::onSensorReadingChanged() |
| 89 { |
| 90 if (!m_polling || m_timer.isActive()) |
| 91 return; |
| 92 double pollingPeriod = 1 / m_frequency; |
| 93 double elapsedTime = WTF::monotonicallyIncreasingTime() - m_lastPollingTimes
tamp; |
| 94 |
| 95 if (elapsedTime >= pollingPeriod) { |
| 96 m_lastPollingTimestamp = WTF::monotonicallyIncreasingTime(); |
| 97 (*m_pollFunc)(); |
| 98 } else { |
| 99 m_timer.startOneShot(pollingPeriod - elapsedTime, BLINK_FROM_HERE); |
| 100 } |
| 101 } |
| 102 |
| 103 void OnChangeSensorPollingStrategy::pollForData(TimerBase*) |
| 104 { |
| 105 if (!m_polling) |
| 106 return; |
| 107 m_lastPollingTimestamp = WTF::monotonicallyIncreasingTime(); |
| 108 (*m_pollFunc)(); |
| 109 } |
| 110 |
| 111 // static |
| 112 SensorPollingStrategy* SensorPollingStrategy::create(double frequency, std::uniq
ue_ptr<Function<void()>> func, device::mojom::blink::ReportingMode mode) |
| 113 { |
| 114 if (mode == device::mojom::blink::ReportingMode::CONTINUOUS) |
| 115 return new ContiniousSensorPollingStrategy(frequency, std::move(func)); |
| 116 |
| 117 return new OnChangeSensorPollingStrategy(frequency, std::move(func)); |
| 118 } |
| 119 |
| 120 } // namespace blink |
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