Index: device/generic_sensor/platform_sensor_reader_linux.h |
diff --git a/device/generic_sensor/platform_sensor_reader_linux.h b/device/generic_sensor/platform_sensor_reader_linux.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..755ad2671af5f80937cd470d8f3ac8851d64f733 |
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+++ b/device/generic_sensor/platform_sensor_reader_linux.h |
@@ -0,0 +1,66 @@ |
+// 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_READER_LINUX_H_ |
+#define DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_READER_LINUX_H_ |
+ |
+#include "base/memory/ref_counted.h" |
+#include "device/generic_sensor/generic_sensor_export.h" |
+ |
+namespace base { |
+class SingleThreadTaskRunner; |
+} |
+ |
+namespace device { |
+ |
+class PlatformSensorLinux; |
+class PlatformSensorConfiguration; |
+struct SensorInfoLinux; |
+ |
+// A generic reader class that can be implemented with two different strategies: |
+// polling and on trigger. |
+class SensorReader { |
+ public: |
+ // Creates a new instance of SensorReader. At the moment, only polling |
+ // reader is supported. |
+ static std::unique_ptr<SensorReader> Create( |
+ const SensorInfoLinux* sensor_device, |
+ PlatformSensorLinux* sensor, |
+ scoped_refptr<base::SingleThreadTaskRunner> polling_thread_task_runner); |
+ |
+ virtual ~SensorReader(); |
+ |
+ // Starts fetching data based on strategy this reader has chosen. |
+ // Only polling strategy is supported at the moment. Thread safe. |
+ virtual bool StartFetchingData( |
+ const PlatformSensorConfiguration& configuration) = 0; |
+ |
+ // Stops fetching data. Thread safe. |
+ virtual void StopFetchingData() = 0; |
+ |
+ protected: |
+ SensorReader(PlatformSensorLinux* sensor, |
+ scoped_refptr<base::SingleThreadTaskRunner> polling_task_runner); |
+ |
+ // Notifies |sensor_| about an error. |
+ void NotifyReadError(); |
+ |
+ // Non-owned pointer to a sensor that created this reader. |
+ PlatformSensorLinux* sensor_; |
+ |
+ // A task runner that is used to poll data. |
+ scoped_refptr<base::SingleThreadTaskRunner> polling_task_runner_; |
+ |
+ // A task runner that belongs to a thread this reader is created on. |
+ scoped_refptr<base::SingleThreadTaskRunner> task_runner_; |
+ |
+ // Indicates if reading is active. |
+ bool is_reading_active_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(SensorReader); |
+}; |
+ |
+} // namespace device |
+ |
+#endif // DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_READER_LINUX_H_ |