WIP : Generic Sensor API implementation

third_party/WebKit/Source/modules/sensor/SensorPollingStrategy.cpp

+// Copyright 2016 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.
+
+#include "modules/sensor/SensorPollingStrategy.h"
+
+#include "platform/Timer.h"
+
+namespace blink {
+
+SensorPollingStrategy::SensorPollingStrategy(double frequencySec, std::unique_ptr<Function<void()>> func)
+    : m_frequency(frequencySec)
+    , m_pollFunc(std::move(func)) { }
+
+class ContiniousSensorPollingStrategy : public SensorPollingStrategy {
+public:
+    DEFINE_INLINE_VIRTUAL_TRACE()
+    {
+        SensorPollingStrategy::trace(visitor);
+    }
+
+    ContiniousSensorPollingStrategy(double frequencySec, std::unique_ptr<Function<void()>> func)
+        : SensorPollingStrategy(frequencySec, std::move(func))
+        , m_timer(this, &ContiniousSensorPollingStrategy::pollForData) {}
+private:
+    // SensorPollingStrategy overrides.
+    void startPolling() override;
+    void stopPolling() override;
+
+    void pollForData(Timer<ContiniousSensorPollingStrategy>*);
+
+    Timer<ContiniousSensorPollingStrategy> m_timer;
+};
+
+void ContiniousSensorPollingStrategy::startPolling()
+{
+    m_timer.startRepeating(1/m_frequency, BLINK_FROM_HERE);
+}
+
+void ContiniousSensorPollingStrategy::stopPolling()
+{
+    m_timer.stop();
+}
+
+void ContiniousSensorPollingStrategy::pollForData(Timer<ContiniousSensorPollingStrategy>*)
+{
+    (*m_pollFunc)();
+}
+
+// static
+SensorPollingStrategy* SensorPollingStrategy::create(double frequencySec, std::unique_ptr<Function<void()>> func, device::sensors::blink::ReportingMode mode)
+{
+    if (mode == device::sensors::blink::ReportingMode::CONTINUOUS)
+        return new ContiniousSensorPollingStrategy(frequencySec, std::move(func));
+    else // FIXME : implement strategy for onchange event
+        return new ContiniousSensorPollingStrategy(frequencySec, std::move(func));
+}
+
+} // namespace blink