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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_base.h" | |
| 6 | |
| 7 #include <utility> | |
| 8 | |
| 9 #include "base/stl_util.h" | |
| 10 #include "device/generic_sensor/public/interfaces/sensor_provider.mojom.h" | |
| 11 | |
| 12 namespace device { | |
| 13 | |
| 14 namespace { | |
| 15 | |
| 16 const uint64_t kReadingBufferSize = sizeof(SensorReadingSharedBuffer); | |
| 17 const uint64_t kSharedBufferSizeInBytes = | |
| 18 kReadingBufferSize * static_cast<uint64_t>(mojom::SensorType::LAST); | |
| 19 | |
| 20 } // namespace | |
| 21 | |
| 22 PlatformSensorProviderBase::PlatformSensorProviderBase() = default; | |
| 23 | |
| 24 PlatformSensorProviderBase::~PlatformSensorProviderBase() { | |
| 25 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); | |
| 26 } | |
| 27 | |
| 28 void PlatformSensorProviderBase::CreateSensor( | |
| 29 mojom::SensorType type, | |
| 30 const CreateSensorCallback& callback) { | |
| 31 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); | |
| 32 | |
| 33 if (!CreateSharedBufferIfNeeded()) { | |
| 34 callback.Run(nullptr); | |
| 35 return; | |
| 36 } | |
| 37 | |
| 38 mojo::ScopedSharedBufferMapping mapping = MapSharedBufferForType(type); | |
| 39 if (!mapping) { | |
| 40 callback.Run(nullptr); | |
| 41 return; | |
| 42 } | |
| 43 | |
| 44 auto it = requests_map_.find(type); | |
| 45 if (it != requests_map_.end()) { | |
| 46 it->second.push_back(callback); | |
| 47 } else { // This is the first CreateSensor call. | |
| 48 requests_map_[type] = CallbackQueue({callback}); | |
| 49 | |
| 50 CreateSensorInternal( | |
| 51 type, std::move(mapping), | |
| 52 base::Bind(&PlatformSensorProviderBase::NotifySensorCreated, | |
| 53 base::Unretained(this), type)); | |
| 54 } | |
| 55 } | |
| 56 | |
| 57 scoped_refptr<PlatformSensor> PlatformSensorProviderBase::GetSensor( | |
| 58 mojom::SensorType type) { | |
| 59 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); | |
| 60 | |
| 61 auto it = sensor_map_.find(type); | |
| 62 if (it != sensor_map_.end()) | |
| 63 return it->second; | |
| 64 return nullptr; | |
| 65 } | |
| 66 | |
| 67 bool PlatformSensorProviderBase::CreateSharedBufferIfNeeded() { | |
| 68 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); | |
| 69 if (shared_buffer_handle_.is_valid()) | |
| 70 return true; | |
| 71 | |
| 72 shared_buffer_handle_ = | |
| 73 mojo::SharedBufferHandle::Create(kSharedBufferSizeInBytes); | |
| 74 return shared_buffer_handle_.is_valid(); | |
| 75 } | |
| 76 | |
| 77 void PlatformSensorProviderBase::RemoveSensor(mojom::SensorType type) { | |
| 78 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); | |
| 79 DCHECK(ContainsKey(sensor_map_, type)); | |
| 80 sensor_map_.erase(type); | |
| 81 | |
| 82 if (sensor_map_.empty()) { | |
| 83 AllSensorsRemoved(); | |
| 84 shared_buffer_handle_.reset(); | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 mojo::ScopedSharedBufferHandle | |
| 89 PlatformSensorProviderBase::CloneSharedBufferHandle() { | |
| 90 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); | |
| 91 CreateSharedBufferIfNeeded(); | |
| 92 return shared_buffer_handle_->Clone( | |
| 93 mojo::SharedBufferHandle::AccessMode::READ_ONLY); | |
| 94 } | |
| 95 | |
| 96 bool PlatformSensorProviderBase::HasSensors() const { | |
| 97 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); | |
| 98 return !sensor_map_.empty(); | |
| 99 } | |
| 100 | |
| 101 void PlatformSensorProviderBase::NotifySensorCreated( | |
| 102 mojom::SensorType type, | |
| 103 scoped_refptr<PlatformSensor> sensor) { | |
| 104 DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); | |
| 105 DCHECK(!ContainsKey(sensor_map_, type)); | |
| 106 DCHECK(ContainsKey(requests_map_, type)); | |
| 107 | |
| 108 if (sensor) | |
| 109 sensor_map_[type] = sensor.get(); | |
| 110 | |
| 111 // Inform subscribers about the sensor. | |
| 112 // |sensor| can be nullptr here. | |
| 113 auto it = requests_map_.find(type); | |
| 114 for (auto& callback : it->second) | |
| 115 callback.Run(sensor); | |
| 116 | |
| 117 requests_map_.erase(type); | |
| 118 } | |
| 119 | |
| 120 std::vector<mojom::SensorType> | |
| 121 PlatformSensorProviderBase::GetPendingRequestTypes() { | |
| 122 std::vector<mojom::SensorType> request_types; | |
| 123 for (auto const& entry : requests_map_) | |
| 124 request_types.push_back(entry.first); | |
| 125 return request_types; | |
| 126 } | |
| 127 | |
| 128 mojo::ScopedSharedBufferMapping | |
| 129 PlatformSensorProviderBase::MapSharedBufferForType(mojom::SensorType type) { | |
| 130 mojo::ScopedSharedBufferMapping mapping = shared_buffer_handle_->MapAtOffset( | |
| 131 kReadingBufferSize, SensorReadingSharedBuffer::GetOffset(type)); | |
| 132 memset(mapping.get(), 0, kReadingBufferSize); | |
| 133 return mapping; | |
| 134 } | |
| 135 | |
| 136 } // namespace device | |
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Chromium Code Reviews
Issue 2865263002:
Move //device/generic_sensor to be part of the internal implementation of the Device Service. (Closed)
