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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 #include "device/generic_sensor/platform_sensor_provider.h" | |
6 | |
7 #include <utility> | |
8 | |
9 #include "base/stl_util.h" | |
10 | |
11 namespace device { | |
12 | |
13 // static | |
14 PlatformSensorProvider* PlatformSensorProvider::Create( | |
15 uint64_t shared_buffer_size) { | |
16 // TODO(shalamov): Add platform-specific PlatformSensorProvider | |
17 // implementations here. | |
timvolodine
2016/08/18 22:52:14
NOTREACHED()?
Mikhail
2016/08/19 09:29:55
'nullptr' just means that there is no available im
| |
18 return nullptr; | |
19 } | |
20 | |
21 PlatformSensorProvider::PlatformSensorProvider(uint64_t shared_buffer_size) | |
22 : shared_buffer_size_(shared_buffer_size) {} | |
23 | |
24 PlatformSensorProvider::~PlatformSensorProvider() = default; | |
25 | |
26 scoped_refptr<PlatformSensor> PlatformSensorProvider::CreateSensor( | |
27 mojom::SensorType type, | |
28 uint64_t size, | |
29 uint64_t offset) { | |
30 DCHECK(CalledOnValidThread()); | |
31 | |
32 if (!CreateSharedBufferIfNeeded()) | |
33 return nullptr; | |
34 | |
35 mojo::ScopedSharedBufferMapping mapping = | |
36 shared_buffer_handle_->MapAtOffset(size, offset); | |
37 if (!mapping) | |
38 return nullptr; | |
39 | |
40 scoped_refptr<PlatformSensor> new_sensor = | |
41 CreateSensorInternal(type, std::move(mapping), size); | |
42 if (!new_sensor) | |
43 return nullptr; | |
44 | |
45 DCHECK(!ContainsKey(sensor_map_, type)); | |
46 sensor_map_[type] = new_sensor.get(); | |
47 | |
48 return new_sensor; | |
49 } | |
50 | |
51 scoped_refptr<PlatformSensor> PlatformSensorProvider::GetSensor( | |
52 mojom::SensorType type) { | |
53 DCHECK(CalledOnValidThread()); | |
54 | |
55 auto it = sensor_map_.find(type); | |
56 if (it != sensor_map_.end()) | |
57 return it->second; | |
58 return nullptr; | |
59 } | |
60 | |
61 bool PlatformSensorProvider::CreateSharedBufferIfNeeded() { | |
62 DCHECK(CalledOnValidThread()); | |
63 if (shared_buffer_handle_.is_valid()) | |
64 return true; | |
65 | |
66 shared_buffer_handle_ = mojo::SharedBufferHandle::Create(shared_buffer_size_); | |
67 return shared_buffer_handle_.is_valid(); | |
68 } | |
69 | |
70 void PlatformSensorProvider::RemoveSensor(mojom::SensorType type) { | |
71 DCHECK(CalledOnValidThread()); | |
72 DCHECK(ContainsKey(sensor_map_, type)); | |
73 sensor_map_.erase(type); | |
74 | |
75 if (sensor_map_.empty()) | |
76 shared_buffer_handle_.reset(); | |
77 } | |
78 | |
79 mojo::ScopedSharedBufferHandle | |
80 PlatformSensorProvider::CloneSharedBufferHandle() { | |
81 DCHECK(CalledOnValidThread()); | |
82 CreateSharedBufferIfNeeded(); | |
83 return shared_buffer_handle_->Clone(); | |
84 } | |
85 | |
86 } // namespace device | |
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