Extract device_sensors to /device via Mojofication

content/browser/device_sensors/data_fetcher_shared_memory_base.cc

-// Copyright 2014 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 "content/browser/device_sensors/data_fetcher_shared_memory_base.h"
-
-#include "base/bind.h"
-#include "base/logging.h"
-#include "base/stl_util.h"
-#include "base/threading/thread.h"
-#include "base/timer/timer.h"
-#include "content/common/device_sensors/device_light_hardware_buffer.h"
-#include "content/common/device_sensors/device_motion_hardware_buffer.h"
-#include "content/common/device_sensors/device_orientation_hardware_buffer.h"
-
-namespace content {
-
-namespace {
-
-size_t GetConsumerSharedMemoryBufferSize(ConsumerType consumer_type) {
-  switch (consumer_type) {
-    case CONSUMER_TYPE_MOTION:
-      return sizeof(DeviceMotionHardwareBuffer);
-    case CONSUMER_TYPE_ORIENTATION:
-      return sizeof(DeviceOrientationHardwareBuffer);
-    case CONSUMER_TYPE_LIGHT:
-      return sizeof(DeviceLightHardwareBuffer);
-    default:
-      NOTREACHED();
-  }
-  return 0;
-}
-
-}  // namespace
-
-class DataFetcherSharedMemoryBase::PollingThread : public base::Thread {
- public:
-  PollingThread(const char* name, DataFetcherSharedMemoryBase* fetcher);
-  ~PollingThread() override;
-
-  void AddConsumer(ConsumerType consumer_type, void* buffer);
-  void RemoveConsumer(ConsumerType consumer_type);
-
-  unsigned GetConsumersBitmask() const { return consumers_bitmask_; }
-  bool IsTimerRunning() const { return timer_ ? timer_->IsRunning() : false; }
-
- private:
-  void DoPoll();
-
-  unsigned consumers_bitmask_;
-  DataFetcherSharedMemoryBase* fetcher_;
-  scoped_ptr<base::RepeatingTimer<PollingThread> > timer_;
-
-  DISALLOW_COPY_AND_ASSIGN(PollingThread);
-};
-
-// --- PollingThread methods
-
-DataFetcherSharedMemoryBase::PollingThread::PollingThread(
-    const char* name, DataFetcherSharedMemoryBase* fetcher)
-    : base::Thread(name),
-      consumers_bitmask_(0),
-      fetcher_(fetcher) {
-}
-
-DataFetcherSharedMemoryBase::PollingThread::~PollingThread() {
-}
-
-void DataFetcherSharedMemoryBase::PollingThread::AddConsumer(
-    ConsumerType consumer_type, void* buffer) {
-  DCHECK(fetcher_);
-  if (!fetcher_->Start(consumer_type, buffer))
-    return;
-
-  consumers_bitmask_ |= consumer_type;
-
-  if (!timer_ && fetcher_->GetType() == FETCHER_TYPE_POLLING_CALLBACK) {
-    timer_.reset(new base::RepeatingTimer<PollingThread>());
-    timer_->Start(FROM_HERE,
-                  fetcher_->GetInterval(),
-                  this, &PollingThread::DoPoll);
-  }
-}
-
-void DataFetcherSharedMemoryBase::PollingThread::RemoveConsumer(
-    ConsumerType consumer_type) {
-  DCHECK(fetcher_);
-  if (!fetcher_->Stop(consumer_type))
-    return;
-
-  consumers_bitmask_ ^= consumer_type;
-
-  if (!consumers_bitmask_)
-    timer_.reset();  // will also stop the timer.
-}
-
-void DataFetcherSharedMemoryBase::PollingThread::DoPoll() {
-  DCHECK(fetcher_);
-  DCHECK(consumers_bitmask_);
-  fetcher_->Fetch(consumers_bitmask_);
-}
-
-// --- end of PollingThread methods
-
-DataFetcherSharedMemoryBase::DataFetcherSharedMemoryBase()
-    : started_consumers_(0) {
-}
-
-DataFetcherSharedMemoryBase::~DataFetcherSharedMemoryBase() {
-  DCHECK_EQ(0u, started_consumers_);
-
-  // make sure polling thread stops asap.
-  if (polling_thread_)
-    polling_thread_->Stop();
-
-  STLDeleteContainerPairSecondPointers(shared_memory_map_.begin(),
-      shared_memory_map_.end());
-}
-
-bool DataFetcherSharedMemoryBase::StartFetchingDeviceData(
-    ConsumerType consumer_type) {
-  if (started_consumers_ & consumer_type)
-    return true;
-
-  void* buffer = GetSharedMemoryBuffer(consumer_type);
-  if (!buffer)
-    return false;
-
-  if (GetType() != FETCHER_TYPE_DEFAULT) {
-    if (!InitAndStartPollingThreadIfNecessary())
-      return false;
-    polling_thread_->message_loop()->PostTask(
-        FROM_HERE,
-        base::Bind(&PollingThread::AddConsumer,
-                   base::Unretained(polling_thread_.get()),
-                   consumer_type, buffer));
-  } else {
-    if (!Start(consumer_type, buffer))
-      return false;
-  }
-
-  started_consumers_ |= consumer_type;
-
-  return true;
-}
-
-bool DataFetcherSharedMemoryBase::StopFetchingDeviceData(
-    ConsumerType consumer_type) {
-  if (!(started_consumers_ & consumer_type))
-    return true;
-
-  if (GetType() != FETCHER_TYPE_DEFAULT) {
-    polling_thread_->message_loop()->PostTask(
-        FROM_HERE,
-        base::Bind(&PollingThread::RemoveConsumer,
-                   base::Unretained(polling_thread_.get()),
-                   consumer_type));
-  } else {
-    if (!Stop(consumer_type))
-      return false;
-  }
-
-  started_consumers_ ^= consumer_type;
-
-  return true;
-}
-
-void DataFetcherSharedMemoryBase::Shutdown() {
-  StopFetchingDeviceData(CONSUMER_TYPE_MOTION);
-  StopFetchingDeviceData(CONSUMER_TYPE_ORIENTATION);
-  StopFetchingDeviceData(CONSUMER_TYPE_LIGHT);
-}
-
-base::SharedMemoryHandle
-DataFetcherSharedMemoryBase::GetSharedMemoryHandleForProcess(
-    ConsumerType consumer_type, base::ProcessHandle process) {
-  SharedMemoryMap::const_iterator it = shared_memory_map_.find(consumer_type);
-  if (it == shared_memory_map_.end())
-    return base::SharedMemory::NULLHandle();
-
-  base::SharedMemoryHandle renderer_handle;
-  it->second->ShareToProcess(process, &renderer_handle);
-  return renderer_handle;
-}
-
-bool DataFetcherSharedMemoryBase::InitAndStartPollingThreadIfNecessary() {
-  if (polling_thread_)
-    return true;
-
-  polling_thread_.reset(
-      new PollingThread("Inertial Device Sensor poller", this));
-
-  if (!polling_thread_->Start()) {
-      LOG(ERROR) << "Failed to start inertial sensor data polling thread";
-      return false;
-  }
-  return true;
-}
-
-void DataFetcherSharedMemoryBase::Fetch(unsigned consumer_bitmask) {
-  NOTIMPLEMENTED();
-}
-
-DataFetcherSharedMemoryBase::FetcherType
-DataFetcherSharedMemoryBase::GetType() const {
-  return FETCHER_TYPE_DEFAULT;
-}
-
-base::TimeDelta DataFetcherSharedMemoryBase::GetInterval() const {
-  return base::TimeDelta::FromMicroseconds(kInertialSensorIntervalMicroseconds);
-}
-
-base::SharedMemory* DataFetcherSharedMemoryBase::GetSharedMemory(
-    ConsumerType consumer_type) {
-  SharedMemoryMap::const_iterator it = shared_memory_map_.find(consumer_type);
-  if (it != shared_memory_map_.end())
-    return it->second;
-
-  size_t buffer_size = GetConsumerSharedMemoryBufferSize(consumer_type);
-  if (buffer_size == 0)
-    return nullptr;
-
-  scoped_ptr<base::SharedMemory> new_shared_mem(new base::SharedMemory);
-  if (new_shared_mem->CreateAndMapAnonymous(buffer_size)) {
-    if (void* mem = new_shared_mem->memory()) {
-      memset(mem, 0, buffer_size);
-      base::SharedMemory* shared_mem = new_shared_mem.release();
-      shared_memory_map_[consumer_type] = shared_mem;
-      return shared_mem;
-    }
-  }
-  LOG(ERROR) << "Failed to initialize shared memory";
-  return nullptr;
-}
-
-void* DataFetcherSharedMemoryBase::GetSharedMemoryBuffer(
-    ConsumerType consumer_type) {
-  if (base::SharedMemory* shared_memory = GetSharedMemory(consumer_type))
-    return shared_memory->memory();
-  return nullptr;
-}
-
-base::MessageLoop* DataFetcherSharedMemoryBase::GetPollingMessageLoop() const {
-  return polling_thread_ ? polling_thread_->message_loop() : nullptr;
-}
-
-bool DataFetcherSharedMemoryBase::IsPollingTimerRunningForTesting() const {
-  return polling_thread_ ? polling_thread_->IsTimerRunning() : false;
-}
-
-}  // namespace content