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1 // Copyright 2014 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 CONTENT_BROWSER_DEVICE_SENSORS_DEVICE_SENSOR_SERVICE_H_ | |
6 #define CONTENT_BROWSER_DEVICE_SENSORS_DEVICE_SENSOR_SERVICE_H_ | |
7 | |
8 #include <memory> | |
9 | |
10 #include "base/callback_forward.h" | |
11 #include "base/macros.h" | |
12 #include "base/memory/shared_memory.h" | |
13 #include "base/memory/singleton.h" | |
14 #include "base/threading/thread_checker.h" | |
15 #include "content/browser/device_sensors/device_sensors_consts.h" | |
16 #include "content/common/content_export.h" | |
17 #include "mojo/public/cpp/system/buffer.h" | |
18 | |
19 namespace content { | |
20 | |
21 class DataFetcherSharedMemory; | |
22 | |
23 // Owns the data fetcher for Device Motion and Orientation and keeps track of | |
24 // the number of consumers currently using the data. The data fetcher is stopped | |
25 // when there are no consumers. | |
26 class CONTENT_EXPORT DeviceSensorService { | |
27 public: | |
28 // Returns the DeviceSensorService singleton. | |
29 static DeviceSensorService* GetInstance(); | |
30 | |
31 // Increments the number of users of the provider. The Provider is running | |
32 // when there's > 0 users, and is paused when the count drops to 0. | |
33 // Must be called on the I/O thread. | |
34 void AddConsumer(ConsumerType consumer_type); | |
35 | |
36 // Removes a consumer. Should be matched with an AddConsumer call. | |
37 // Must be called on the I/O thread. | |
38 void RemoveConsumer(ConsumerType cosumer_type); | |
39 | |
40 // Returns the shared memory handle of the device motion data. | |
41 mojo::ScopedSharedBufferHandle GetSharedMemoryHandle( | |
42 ConsumerType consumer_type); | |
43 | |
44 // Stop/join with the background polling thread in |provider_|. | |
45 void Shutdown(); | |
46 | |
47 // Injects a custom data fetcher for testing purposes. This class takes | |
48 // ownership of the injected object. | |
49 void SetDataFetcherForTesting(DataFetcherSharedMemory* test_data_fetcher); | |
50 | |
51 private: | |
52 friend struct base::DefaultSingletonTraits<DeviceSensorService>; | |
53 | |
54 DeviceSensorService(); | |
55 virtual ~DeviceSensorService(); | |
56 | |
57 bool ChangeNumberConsumers(ConsumerType consumer_type, int delta); | |
58 int GetNumberConsumers(ConsumerType consumer_type) const; | |
59 | |
60 int num_light_readers_; | |
61 int num_motion_readers_; | |
62 int num_orientation_readers_; | |
63 int num_orientation_absolute_readers_; | |
64 bool is_shutdown_; | |
65 std::unique_ptr<DataFetcherSharedMemory> data_fetcher_; | |
66 base::ThreadChecker thread_checker_; | |
67 | |
68 DISALLOW_COPY_AND_ASSIGN(DeviceSensorService); | |
69 }; | |
70 | |
71 } // namespace content | |
72 | |
73 #endif // CONTENT_BROWSER_DEVICE_SENSORS_DEVICE_SENSOR_SERVICE_H_ | |
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