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/message_loop/message_loop.h"
  11 #include "base/stl_util.h"
  12
  13 #if defined(OS_LINUX) && defined(USE_UDEV)
  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 HidService* g_service = NULL;
  26
  27 }  // namespace
  28
  29 class HidService::Destroyer : public base::MessageLoop::DestructionObserver {
  30  public:
  31   explicit Destroyer(HidService* hid_service)
  32       : hid_service_(hid_service) {}
  33   ~Destroyer() override {}
  34
  35  private:
  36   // base::MessageLoop::DestructionObserver implementation.
  37   void WillDestroyCurrentMessageLoop() override {
  38     base::MessageLoop::current()->RemoveDestructionObserver(this);
  39     delete hid_service_;
  40     delete this;
  41     g_service = NULL;
  42   }
  43
  44   HidService* hid_service_;
  45 };
  46
  47 HidService* HidService::GetInstance(
  48     scoped_refptr<base::SingleThreadTaskRunner> file_task_runner,
  49     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
  50   if (g_service == NULL) {
  51 #if defined(OS_LINUX) && defined(USE_UDEV)
  52     g_service = new HidServiceLinux(ui_task_runner);
  53 #elif defined(OS_MACOSX)
  54     g_service = new HidServiceMac(file_task_runner);
  55 #elif defined(OS_WIN)
  56     g_service = new HidServiceWin();
  57 #endif
  58     if (g_service != NULL) {
  59       Destroyer* destroyer = new Destroyer(g_service);
  60       base::MessageLoop::current()->AddDestructionObserver(destroyer);
  61     }
  62   }
  63   return g_service;
  64 }
  65
  66 HidService::~HidService() {
  67   DCHECK(thread_checker_.CalledOnValidThread());
  68 }
  69
  70 void HidService::GetDevices(std::vector<HidDeviceInfo>* devices) {
  71   DCHECK(thread_checker_.CalledOnValidThread());
  72   STLClearObject(devices);
  73   for (DeviceMap::iterator it = devices_.begin();
  74       it != devices_.end();
  75       ++it) {
  76     devices->push_back(it->second);
  77   }
  78 }
  79
  80 // Fills in the device info struct of the given device_id.
  81 bool HidService::GetDeviceInfo(const HidDeviceId& device_id,
  82                                HidDeviceInfo* info) const {
  83   DeviceMap::const_iterator it = devices_.find(device_id);
  84   if (it == devices_.end())
  85     return false;
  86   *info = it->second;
  87   return true;
  88 }
  89
  90 HidService::HidService() {
  91   DCHECK(thread_checker_.CalledOnValidThread());
  92 }
  93
  94 void HidService::AddDevice(const HidDeviceInfo& info) {
  95   DCHECK(thread_checker_.CalledOnValidThread());
  96   if (!ContainsKey(devices_, info.device_id)) {
  97     devices_[info.device_id] = info;
  98   }
  99 }
 100
 101 void HidService::RemoveDevice(const HidDeviceId& device_id) {
 102   DCHECK(thread_checker_.CalledOnValidThread());
 103   DeviceMap::iterator it = devices_.find(device_id);
 104   if (it != devices_.end())
 105     devices_.erase(it);
 106 }
 107
 108 }  // namespace device