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 #include "base/threading/thread_restrictions.h"
  13
  14 #if defined(OS_LINUX) && defined(USE_UDEV)
  15 #include "device/hid/hid_service_linux.h"
  16 #elif defined(OS_MACOSX)
  17 #include "device/hid/hid_service_mac.h"
  18 #else
  19 #include "device/hid/hid_service_win.h"
  20 #endif
  21
  22 namespace device {
  23
  24 namespace {
  25
  26 HidService* g_service = NULL;
  27
  28 }  // namespace
  29
  30 class HidService::Destroyer : public base::MessageLoop::DestructionObserver {
  31  public:
  32   explicit Destroyer(HidService* hid_service)
  33       : hid_service_(hid_service) {}
  34   virtual ~Destroyer() {}
  35
  36  private:
  37   // base::MessageLoop::DestructionObserver implementation.
  38   virtual void WillDestroyCurrentMessageLoop() OVERRIDE {
  39     base::MessageLoop::current()->RemoveDestructionObserver(this);
  40     delete hid_service_;
  41     delete this;
  42     g_service = NULL;
  43   }
  44
  45   HidService* hid_service_;
  46 };
  47
  48 HidService* HidService::GetInstance(
  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();
  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   base::ThreadRestrictions::AssertIOAllowed();
  92   DCHECK(thread_checker_.CalledOnValidThread());
  93 }
  94
  95 void HidService::AddDevice(const HidDeviceInfo& info) {
  96   DCHECK(thread_checker_.CalledOnValidThread());
  97   if (!ContainsKey(devices_, info.device_id)) {
  98     devices_[info.device_id] = info;
  99   }
 100 }
 101
 102 void HidService::RemoveDevice(const HidDeviceId& device_id) {
 103   DCHECK(thread_checker_.CalledOnValidThread());
 104   DeviceMap::iterator it = devices_.find(device_id);
 105   if (it != devices_.end())
 106     devices_.erase(it);
 107 }
 108
 109 const HidService::DeviceMap& HidService::GetDevicesNoEnumerate() const {
 110   return devices_;
 111 }
 112
 113 }  // namespace device