1 // Copyright 2013 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 "content/browser/device_orientation/device_motion_service.h" 6 7 #include "base/bind.h" 8 #include "base/logging.h" 9 #include "base/memory/singleton.h" 10 #include "content/browser/device_orientation/device_motion_provider.h" 11 #include "content/public/browser/render_process_host.h" 12 13 namespace content { 14 15 DeviceMotionService::DeviceMotionService() 16 : num_readers_(0), 17 is_shutdown_(false) { 18 } 19 20 DeviceMotionService::~DeviceMotionService() { 21 } 22 23 DeviceMotionService* DeviceMotionService::GetInstance() { 24 return Singleton<DeviceMotionService, 25 LeakySingletonTraits<DeviceMotionService> >::get(); 26 } 27 28 void DeviceMotionService::AddConsumer() { 29 DCHECK(thread_checker_.CalledOnValidThread()); 30 if (is_shutdown_) 31 return; 32 33 num_readers_++; 34 DCHECK(num_readers_ > 0); 35 if (!provider_.get()) 36 provider_.reset(new DeviceMotionProvider); 37 provider_->StartFetchingDeviceMotionData(); 38 } 39 40 void DeviceMotionService::RemoveConsumer() { 41 DCHECK(thread_checker_.CalledOnValidThread()); 42 if (is_shutdown_) 43 return; 44 45 --num_readers_; 46 DCHECK(num_readers_ >= 0); 47 48 if (num_readers_ == 0) { 49 LOG(INFO) << "ACTIVE service stop fetching"; 50 provider_->StopFetchingDeviceMotionData(); 51 } 52 } 53 54 void DeviceMotionService::Shutdown() { 55 provider_.reset(); 56 is_shutdown_ = true; 57 } 58 59 base::SharedMemoryHandle DeviceMotionService::GetSharedMemoryHandleForProcess( 60 base::ProcessHandle handle) { 61 DCHECK(thread_checker_.CalledOnValidThread()); 62 return provider_->GetSharedMemoryHandleForProcess(handle); 63 } 64 65 } // namespace content 66
