WIP : Generic Sensor API implementation

third_party/WebKit/Source/modules/sensor/Sensor.h

 // 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.
 
 #ifndef Sensor_h
 #define Sensor_h
 
 #include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/frame/PlatformEventController.h"
 #include "modules/EventTargetModules.h"
 #include "modules/ModulesExport.h"
+#include "modules/sensor/SensorController.h"
 #include "modules/sensor/SensorOptions.h"
-#include "modules/sensor/SensorState.h"
+#include "modules/sensor/SensorReading.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class ExceptionState;
 class ScriptState;
 class SensorReading;
+class SensorPollingStrategy;
 
 class MODULES_EXPORT Sensor
     : public EventTargetWithInlineData
     , public ActiveScriptWrappable
     , public ActiveDOMObject
-    , public PlatformEventController {
+    , public SensorController::Observer {
     USING_GARBAGE_COLLECTED_MIXIN(Sensor);
     DEFINE_WRAPPERTYPEINFO();
 
 public:
-    ~Sensor() override;
+    enum class SensorState : int {
+      IDLE,
+      ACTIVATING,
+      ACTIVE,
+      ERRORED
+    };
 
-    void start(ScriptState*, ExceptionState&);
-    void stop(ScriptState*, ExceptionState&);
-    void updateState(SensorState);
+    virtual void start(ScriptState*, ExceptionState&);
+    virtual void stop(ScriptState*, ExceptionState&);
 
-    // EventTarget implementation.
+    // EventTarget overrides.
     const AtomicString& interfaceName() const override { return EventTargetNames::Sensor; }
     ExecutionContext* getExecutionContext() const override { return ContextLifecycleObserver::getExecutionContext(); }
 
     // Getters
     String state() const;
     // TODO(riju): crbug.com/614797 .
     SensorReading* reading() const;
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(error);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(change);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(statechange);
 
-    // ActiveDOMObject implementation.
-    void suspend() override;
-    void resume() override;
-    void stop() override;
-    bool hasPendingActivity() const override;
-
     DECLARE_VIRTUAL_TRACE();
 
 protected:
-    Sensor(ExecutionContext*, const SensorOptions&);
-    void notifyStateChange();
+    Sensor(ExecutionContext*, const SensorOptions&, device::sensors::blink::SensorType type);
+    virtual SensorReading* createSensorReading() = 0;
+    virtual device::sensors::blink::SensorConfigurationPtr createSensorOptions() = 0;
 
-    SensorState m_sensorState;
+    // Getters to be used by implementations.
+    const SensorOptions& options() const { return m_sensorOptions; }
+    SensorController* controller() { return m_controller; }
+
+private:
+    void InitControllerIfNeeded();
+
+    // EventTargetWithInlineData overrides.
+    void addedEventListener(const AtomicString& eventType, RegisteredEventListener&) override;
+    void removedEventListener(const AtomicString& eventType, const RegisteredEventListener&) override;
+
+    // ActiveDOMObject overrides.
+    void stop() override {}
+
+    // SensorController::Observer overrides.    
+    void onSensorInitialized() override;
+    void onSensorReadingChanged() override;
+    void onSensorError() override;
+
+    // ActiveScriptWrappable overrides.
+    bool hasPendingActivity() const override;
+
+    void onStartRequestCompleted(bool);
+    void onStopRequestCompleted(bool);
+    void pollForData();
+
+    void updateState(SensorState newState);
+    void reportError();
+
+    void updatePollingStatus();
+
+private:
     Member<SensorReading> m_sensorReading;
     SensorOptions m_sensorOptions;
+    device::sensors::blink::SensorType m_type;
+    SensorState m_state;
+    WeakMember<SensorController> m_controller;
+    Member<SensorPollingStrategy> m_polling;
 };
 
 } // namespace blink
 
 #endif // Sensor_h