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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_pollFunc)(); |
| 41 m_timer.startRepeating(1 / m_frequency, BLINK_FROM_HERE); |
| 42 } |
| 43 |
| 44 void ContiniousSensorPollingStrategy::stopPolling() |
| 45 { |
| 46 m_timer.stop(); |
| 47 } |
| 48 |
| 49 void ContiniousSensorPollingStrategy::pollForData(TimerBase*) |
| 50 { |
| 51 (*m_pollFunc)(); |
| 52 } |
| 53 |
| 54 class OnChangeSensorPollingStrategy : public SensorPollingStrategy { |
| 55 public: |
| 56 DEFINE_INLINE_VIRTUAL_TRACE() |
| 57 { |
| 58 SensorPollingStrategy::trace(visitor); |
| 59 } |
| 60 |
| 61 OnChangeSensorPollingStrategy(double frequency, std::unique_ptr<Function<voi
d()>> func) |
| 62 : SensorPollingStrategy(frequency, std::move(func)) |
| 63 , m_timer(this, &OnChangeSensorPollingStrategy::pollForData) |
| 64 , m_polling(false) |
| 65 , m_lastPollingTimestamp(0.0) {} |
| 66 private: |
| 67 // SensorPollingStrategy overrides. |
| 68 void startPolling() override; |
| 69 void stopPolling() override; |
| 70 void onSensorReadingChanged() override; |
| 71 |
| 72 void pollForData(TimerBase*); |
| 73 |
| 74 Timer<OnChangeSensorPollingStrategy> m_timer; |
| 75 bool m_polling; |
| 76 double m_lastPollingTimestamp; |
| 77 }; |
| 78 |
| 79 void OnChangeSensorPollingStrategy::startPolling() |
| 80 { |
| 81 (*m_pollFunc)(); |
| 82 m_polling = true; |
| 83 } |
| 84 |
| 85 void OnChangeSensorPollingStrategy::stopPolling() |
| 86 { |
| 87 m_polling = false; |
| 88 } |
| 89 |
| 90 void OnChangeSensorPollingStrategy::onSensorReadingChanged() |
| 91 { |
| 92 if (!m_polling || m_timer.isActive()) |
| 93 return; |
| 94 double pollingPeriod = 1 / m_frequency; |
| 95 double elapsedTime = WTF::monotonicallyIncreasingTime() - m_lastPollingTimes
tamp; |
| 96 |
| 97 if (elapsedTime >= pollingPeriod) { |
| 98 m_lastPollingTimestamp = WTF::monotonicallyIncreasingTime(); |
| 99 (*m_pollFunc)(); |
| 100 } else { |
| 101 m_timer.startOneShot(pollingPeriod - elapsedTime, BLINK_FROM_HERE); |
| 102 } |
| 103 } |
| 104 |
| 105 void OnChangeSensorPollingStrategy::pollForData(TimerBase*) |
| 106 { |
| 107 if (!m_polling) |
| 108 return; |
| 109 m_lastPollingTimestamp = WTF::monotonicallyIncreasingTime(); |
| 110 (*m_pollFunc)(); |
| 111 } |
| 112 |
| 113 // static |
| 114 SensorPollingStrategy* SensorPollingStrategy::create(double frequency, std::uniq
ue_ptr<Function<void()>> func, device::mojom::blink::ReportingMode mode) |
| 115 { |
| 116 if (mode == device::mojom::blink::ReportingMode::CONTINUOUS) |
| 117 return new ContiniousSensorPollingStrategy(frequency, std::move(func)); |
| 118 |
| 119 return new OnChangeSensorPollingStrategy(frequency, std::move(func)); |
| 120 } |
| 121 |
| 122 } // namespace blink |
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