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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 #ifndef DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_READER_LINUX_H_ | |
6 #define DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_READER_LINUX_H_ | |
7 | |
8 #include "base/callback.h" | |
9 #include "base/memory/ref_counted.h" | |
10 #include "base/memory/weak_ptr.h" | |
11 #include "base/threading/thread_checker.h" | |
12 #include "device/generic_sensor/generic_sensor_export.h" | |
13 | |
14 namespace base { | |
15 class SingleThreadTaskRunner; | |
16 } | |
17 | |
18 namespace device { | |
19 | |
20 class PlatformSensorConfiguration; | |
21 class PlatformSensorLinux; | |
22 struct SensorInfoLinux; | |
23 | |
24 // A generic reader class that can be implemented with two different strategies: | |
25 // polling and on trigger. All methods are not thread-safe and must be called | |
26 // on a polling thread that allows I/O. | |
27 class SensorReader { | |
28 public: | |
29 // Creates a new instance of SensorReader. At the moment, only polling | |
30 // reader is supported. | |
31 static std::unique_ptr<SensorReader> Create( | |
32 const SensorInfoLinux* sensor_device, | |
33 base::WeakPtr<PlatformSensorLinux> sensor, | |
34 scoped_refptr<base::SingleThreadTaskRunner> task_runner); | |
35 | |
36 virtual ~SensorReader(); | |
37 | |
38 // Starts fetching data based on strategy this reader has chosen. | |
39 // Only polling strategy is supported at the moment. | |
40 virtual void StartFetchingData( | |
41 const PlatformSensorConfiguration& configuration) = 0; | |
42 | |
43 // Stops fetching data. | |
44 virtual void StopFetchingData() = 0; | |
45 | |
46 protected: | |
47 SensorReader(base::WeakPtr<PlatformSensorLinux> sensor, | |
48 scoped_refptr<base::SingleThreadTaskRunner> task_runner); | |
49 | |
50 // Notifies |sensor_| about an error. | |
51 void NotifyReadError(); | |
52 | |
53 // In builds with DCHECK enabled checks that methods of this | |
54 // and derived classes are called on a right thread. | |
55 THREAD_CHECKER(thread_checker_); | |
56 | |
57 // A sensor that this reader is owned by and notifies about errors and | |
58 // readings to. | |
59 base::WeakPtr<PlatformSensorLinux> sensor_; | |
60 | |
61 // A task runner that is used to report about new readings and errors | |
62 // to a |sensor_|. | |
63 scoped_refptr<base::SingleThreadTaskRunner> task_runner_; | |
64 | |
65 // Indicates if reading is active. | |
66 bool is_reading_active_; | |
67 | |
68 DISALLOW_COPY_AND_ASSIGN(SensorReader); | |
69 }; | |
70 | |
71 } // namespace device | |
72 | |
73 #endif // DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_READER_LINUX_H_ | |
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