device/hid/hid_service.cc

   1 // Copyright 2014 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/hid/hid_service.h"
   6
   7 #include "base/lazy_instance.h"
   8 #include "base/logging.h"
   9 #include "base/memory/scoped_vector.h"
  10 #include "base/stl_util.h"
  11 #include "base/threading/thread_restrictions.h"
  12
  13 #if defined(OS_LINUX)
  14 #include "device/hid/hid_service_linux.h"
  15 #elif defined(OS_MACOSX)
  16 #include "device/hid/hid_service_mac.h"
  17 #else
  18 #include "device/hid/hid_service_win.h"
  19 #endif
  20
  21 namespace device {
  22
  23 namespace {
  24
  25 // The instance will be reset when message loop destroys.
  26 base::LazyInstance<scoped_ptr<HidService> >::Leaky g_hid_service_ptr =
  27     LAZY_INSTANCE_INITIALIZER;
  28
  29 }  // namespace
  30
  31 void HidService::GetDevices(std::vector<HidDeviceInfo>* devices) {
  32   DCHECK(thread_checker_.CalledOnValidThread());
  33   STLClearObject(devices);
  34   for (DeviceMap::iterator it = devices_.begin();
  35       it != devices_.end();
  36       ++it) {
  37     devices->push_back(it->second);
  38   }
  39 }
  40
  41 // Fills in the device info struct of the given device_id.
  42 bool HidService::GetDeviceInfo(const HidDeviceId& device_id,
  43                                HidDeviceInfo* info) const {
  44   DeviceMap::const_iterator it = devices_.find(device_id);
  45   if (it == devices_.end())
  46     return false;
  47   *info = it->second;
  48   return true;
  49 }
  50
  51 void HidService::WillDestroyCurrentMessageLoop() {
  52   DCHECK(thread_checker_.CalledOnValidThread());
  53   g_hid_service_ptr.Get().reset(NULL);
  54 }
  55
  56 HidService::HidService() {
  57   base::ThreadRestrictions::AssertIOAllowed();
  58   DCHECK(thread_checker_.CalledOnValidThread());
  59   base::MessageLoop::current()->AddDestructionObserver(this);
  60 }
  61
  62 HidService::~HidService() {
  63   DCHECK(thread_checker_.CalledOnValidThread());
  64   base::MessageLoop::current()->RemoveDestructionObserver(this);
  65 }
  66
  67 HidService* HidService::CreateInstance() {
  68 #if defined(OS_LINUX)
  69     return new HidServiceLinux();
  70 #elif defined(OS_MACOSX)
  71     return new HidServiceMac();
  72 #elif defined(OS_WIN)
  73     return new HidServiceWin();
  74 #else
  75     return NULL;
  76 #endif
  77 }
  78
  79 void HidService::AddDevice(const HidDeviceInfo& info) {
  80   DCHECK(thread_checker_.CalledOnValidThread());
  81   if (!ContainsKey(devices_, info.device_id)) {
  82     devices_[info.device_id] = info;
  83   }
  84 }
  85
  86 void HidService::RemoveDevice(const HidDeviceId& device_id) {
  87   DCHECK(thread_checker_.CalledOnValidThread());
  88   DeviceMap::iterator it = devices_.find(device_id);
  89   if (it != devices_.end())
  90     devices_.erase(it);
  91 }
  92
  93 HidService* HidService::GetInstance() {
  94   if (!g_hid_service_ptr.Get().get())
  95     g_hid_service_ptr.Get().reset(CreateInstance());
  96   return g_hid_service_ptr.Get().get();
  97 }
  98
  99 }  // namespace device