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Unified Diff: device/generic_sensor/platform_sensor_provider.h

Issue 2144623003: [sensors] Introduce Generic Sensor API interfaces (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Comments from Tim and Ken Created 4 years, 4 months ago
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Index: device/generic_sensor/platform_sensor_provider.h
diff --git a/device/generic_sensor/platform_sensor_provider.h b/device/generic_sensor/platform_sensor_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..8b3c9a72b794eafa505d9c1cecea1b794b021e38
--- /dev/null
+++ b/device/generic_sensor/platform_sensor_provider.h
@@ -0,0 +1,60 @@
+// 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 DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_PROVIDER_H_
+#define DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_PROVIDER_H_
+
+#include "base/macros.h"
+
+#include "base/threading/non_thread_safe.h"
+#include "device/generic_sensor/platform_sensor.h"
+
+namespace device {
+
+// Base class that defines factory methods for PlatformSensor creation.
+// Its implementations must be accessed via GetInstance() method.
+class PlatformSensorProvider : public base::NonThreadSafe {
+ public:
+ // Note: returns 'nullptr' if there is no available implementation for
+ // the current platform.
+ static PlatformSensorProvider* GetInstance();
+
+ // Creates new instance of PlatformSensor.
+ scoped_refptr<PlatformSensor> CreateSensor(mojom::SensorType type,
+ uint64_t size,
+ uint64_t offset);
+
+ // Gets previously created instance of PlatformSensor by sensor type |type|.
+ scoped_refptr<PlatformSensor> GetSensor(mojom::SensorType type);
+
+ // Shared buffer getters.
+ mojo::ScopedSharedBufferHandle CloneSharedBufferHandle();
+
+ protected:
+ PlatformSensorProvider();
+ virtual ~PlatformSensorProvider();
+
+ // Method that must be implemented by platform specific classes.
+ virtual scoped_refptr<PlatformSensor> CreateSensorInternal(
+ mojom::SensorType type,
+ mojo::ScopedSharedBufferMapping mapping,
+ uint64_t buffer_size) = 0;
+
+ private:
+ friend class PlatformSensor; // To call RemoveSensor();
+
+ bool CreateSharedBufferIfNeeded();
+ void RemoveSensor(mojom::SensorType type);
+
+ private:
+ std::map<mojom::SensorType, PlatformSensor*> sensor_map_;
+ mojo::ScopedSharedBufferHandle shared_buffer_handle_;
+
+ static PlatformSensorProvider* s_instance_;
+ DISALLOW_COPY_AND_ASSIGN(PlatformSensorProvider);
+};
+
+} // namespace device
+
+#endif // DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_PROVIDER_H_

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