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      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   virtual ~Destroyer() {}
     34 
     35  private:
     36   // base::MessageLoop::DestructionObserver implementation.
     37   virtual 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
    109