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      1 // Copyright (c) 2012 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 "base/system_monitor/system_monitor.h"
      6 
      7 #include <utility>
      8 
      9 #include "base/logging.h"
     10 #include "base/message_loop/message_loop.h"
     11 #include "base/time/time.h"
     12 
     13 namespace base {
     14 
     15 static SystemMonitor* g_system_monitor = NULL;
     16 
     17 SystemMonitor::SystemMonitor()
     18     :  devices_changed_observer_list_(
     19           new ObserverListThreadSafe<DevicesChangedObserver>()) {
     20   DCHECK(!g_system_monitor);
     21   g_system_monitor = this;
     22 }
     23 
     24 SystemMonitor::~SystemMonitor() {
     25   DCHECK_EQ(this, g_system_monitor);
     26   g_system_monitor = NULL;
     27 }
     28 
     29 // static
     30 SystemMonitor* SystemMonitor::Get() {
     31   return g_system_monitor;
     32 }
     33 
     34 void SystemMonitor::ProcessDevicesChanged(DeviceType device_type) {
     35   NotifyDevicesChanged(device_type);
     36 }
     37 
     38 void SystemMonitor::AddDevicesChangedObserver(DevicesChangedObserver* obs) {
     39   devices_changed_observer_list_->AddObserver(obs);
     40 }
     41 
     42 void SystemMonitor::RemoveDevicesChangedObserver(DevicesChangedObserver* obs) {
     43   devices_changed_observer_list_->RemoveObserver(obs);
     44 }
     45 
     46 void SystemMonitor::NotifyDevicesChanged(DeviceType device_type) {
     47   DVLOG(1) << "DevicesChanged with device type " << device_type;
     48   devices_changed_observer_list_->Notify(
     49       &DevicesChangedObserver::OnDevicesChanged, device_type);
     50 }
     51 
     52 }  // namespace base
     53