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Unified Diff: device/generic_sensor/platform_sensor_provider.cc

Issue 2144623003: [sensors] Introduce Generic Sensor API interfaces (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Comments from Tim and Ken Created 4 years, 4 months ago
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Index: device/generic_sensor/platform_sensor_provider.cc
diff --git a/device/generic_sensor/platform_sensor_provider.cc b/device/generic_sensor/platform_sensor_provider.cc
new file mode 100644
index 0000000000000000000000000000000000000000..491bd7c242cd4d378066b9a565af6fabcb16964d
--- /dev/null
+++ b/device/generic_sensor/platform_sensor_provider.cc
@@ -0,0 +1,95 @@
+// 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.
+
+#include "device/generic_sensor/platform_sensor_provider.h"
+
+#include <utility>
+
+#include "base/stl_util.h"
+#include "device/generic_sensor/public/interfaces/sensor_provider.mojom.h"
+
+namespace device {
+
+namespace {
+
+const uint64_t kSharedBufferSizeInBytes =
+ mojom::SensorReadBuffer::kReadBufferSize *
+ static_cast<uint64_t>(mojom::SensorType::LAST);
+
+} // namespace
+
+PlatformSensorProvider* PlatformSensorProvider::s_instance_ = nullptr;
+
+// static
+PlatformSensorProvider* PlatformSensorProvider::GetInstance() {
+ // TODO(shalamov): Lazily initialize s_instance_ with platform-specific
+ // PlatformSensorProvider implementations here.
+ return s_instance_;
timvolodine 2016/08/19 16:02:30 we usually use return base::Singleton<.... instead
Mikhail 2016/08/19 19:10:02 I was considering using of Singleton, but here I b
timvolodine 2016/08/22 18:42:46 There is no need for #ifdefs when you follow the s
Mikhail 2016/08/22 19:16:15 Thanks for the links! so the solution could be to
timvolodine 2016/08/22 19:42:25 yes please, thanks ;)
+}
+
+PlatformSensorProvider::PlatformSensorProvider() = default;
+PlatformSensorProvider::~PlatformSensorProvider() = default;
+
+scoped_refptr<PlatformSensor> PlatformSensorProvider::CreateSensor(
+ mojom::SensorType type,
+ uint64_t size,
+ uint64_t offset) {
+ DCHECK(CalledOnValidThread());
+
+ if (!CreateSharedBufferIfNeeded())
+ return nullptr;
+
+ mojo::ScopedSharedBufferMapping mapping =
+ shared_buffer_handle_->MapAtOffset(size, offset);
+ if (!mapping)
+ return nullptr;
+
+ scoped_refptr<PlatformSensor> new_sensor =
+ CreateSensorInternal(type, std::move(mapping), size);
+ if (!new_sensor)
+ return nullptr;
+
+ DCHECK(!ContainsKey(sensor_map_, type));
+ sensor_map_[type] = new_sensor.get();
+
+ return new_sensor;
+}
+
+scoped_refptr<PlatformSensor> PlatformSensorProvider::GetSensor(
+ mojom::SensorType type) {
+ DCHECK(CalledOnValidThread());
+
+ auto it = sensor_map_.find(type);
+ if (it != sensor_map_.end())
+ return it->second;
+ return nullptr;
+}
+
+bool PlatformSensorProvider::CreateSharedBufferIfNeeded() {
+ DCHECK(CalledOnValidThread());
+ if (shared_buffer_handle_.is_valid())
+ return true;
+
+ shared_buffer_handle_ =
+ mojo::SharedBufferHandle::Create(kSharedBufferSizeInBytes);
+ return shared_buffer_handle_.is_valid();
+}
+
+void PlatformSensorProvider::RemoveSensor(mojom::SensorType type) {
+ DCHECK(CalledOnValidThread());
+ DCHECK(ContainsKey(sensor_map_, type));
+ sensor_map_.erase(type);
+
+ if (sensor_map_.empty())
+ shared_buffer_handle_.reset();
+}
+
+mojo::ScopedSharedBufferHandle
+PlatformSensorProvider::CloneSharedBufferHandle() {
+ DCHECK(CalledOnValidThread());
+ CreateSharedBufferIfNeeded();
+ return shared_buffer_handle_->Clone();
+}
+
+} // namespace device

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