device/bluetooth/bluetooth_gatt_notify_session_chromeos.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/bluetooth/bluetooth_gatt_notify_session_chromeos.h"
   6
   7 #include "base/bind.h"
   8 #include "base/logging.h"
   9 #include "chromeos/dbus/dbus_thread_manager.h"
  10 #include "device/bluetooth/bluetooth_adapter.h"
  11 #include "device/bluetooth/bluetooth_device.h"
  12 #include "device/bluetooth/bluetooth_gatt_service.h"
  13 #include "device/bluetooth/bluetooth_remote_gatt_characteristic_chromeos.h"
  14
  15 namespace chromeos {
  16
  17 BluetoothGattNotifySessionChromeOS::BluetoothGattNotifySessionChromeOS(
  18     scoped_refptr<device::BluetoothAdapter> adapter,
  19     const std::string& device_address,
  20     const std::string& service_identifier,
  21     const std::string& characteristic_identifier,
  22     const dbus::ObjectPath& characteristic_path)
  23     : active_(true),
  24       adapter_(adapter),
  25       device_address_(device_address),
  26       service_id_(service_identifier),
  27       characteristic_id_(characteristic_identifier),
  28       object_path_(characteristic_path) {
  29   DCHECK(adapter_.get());
  30   DCHECK(!device_address_.empty());
  31   DCHECK(!service_id_.empty());
  32   DCHECK(!characteristic_id_.empty());
  33   DCHECK(object_path_.IsValid());
  34
  35   DBusThreadManager::Get()->GetBluetoothGattCharacteristicClient()->AddObserver(
  36       this);
  37 }
  38
  39 BluetoothGattNotifySessionChromeOS::~BluetoothGattNotifySessionChromeOS() {
  40   DBusThreadManager::Get()
  41       ->GetBluetoothGattCharacteristicClient()
  42       ->RemoveObserver(this);
  43   Stop(base::Bind(&base::DoNothing));
  44 }
  45
  46 std::string BluetoothGattNotifySessionChromeOS::GetCharacteristicIdentifier()
  47     const {
  48   return characteristic_id_;
  49 }
  50
  51 bool BluetoothGattNotifySessionChromeOS::IsActive() {
  52   // Determine if the session is active. If |active_| is false, then it's
  53   // been explicitly marked, so return false.
  54   if (!active_)
  55     return false;
  56
  57   // The fact that |active_| is true doesn't mean that the session is
  58   // actually active, since the characteristic might have stopped sending
  59   // notifications yet this method was called before we processed the
  60   // observer event (e.g. because somebody else called this method in their
  61   // BluetoothGattCharacteristicClient::Observer implementation, which was
  62   // called before ours). Check the client to see if notifications are still
  63   // being sent.
  64   BluetoothGattCharacteristicClient::Properties* properties =
  65       DBusThreadManager::Get()
  66           ->GetBluetoothGattCharacteristicClient()
  67           ->GetProperties(object_path_);
  68   if (!properties || !properties->notifying.value())
  69     active_ = false;
  70
  71   return active_;
  72 }
  73
  74 void BluetoothGattNotifySessionChromeOS::Stop(const base::Closure& callback) {
  75   if (!active_) {
  76     VLOG(1) << "Notify session already inactive.";
  77     callback.Run();
  78     return;
  79   }
  80
  81   // Mark this session as inactive no matter what.
  82   active_ = false;
  83
  84   device::BluetoothDevice* device = adapter_->GetDevice(device_address_);
  85   if (!device)
  86     return;
  87
  88   device::BluetoothGattService* service = device->GetGattService(service_id_);
  89   if (!service)
  90     return;
  91
  92   BluetoothRemoteGattCharacteristicChromeOS* chrc =
  93       static_cast<BluetoothRemoteGattCharacteristicChromeOS*>(
  94           service->GetCharacteristic(characteristic_id_));
  95   if (!chrc)
  96     return;
  97
  98   chrc->RemoveNotifySession(callback);
  99 }
 100
 101 void BluetoothGattNotifySessionChromeOS::GattCharacteristicRemoved(
 102     const dbus::ObjectPath& object_path) {
 103   if (object_path != object_path_)
 104     return;
 105
 106   active_ = false;
 107 }
 108
 109 void BluetoothGattNotifySessionChromeOS::GattCharacteristicPropertyChanged(
 110     const dbus::ObjectPath& object_path,
 111     const std::string& property_name) {
 112   if (object_path != object_path_)
 113     return;
 114
 115   if (!active_)
 116     return;
 117
 118   BluetoothGattCharacteristicClient::Properties* properties =
 119       DBusThreadManager::Get()
 120           ->GetBluetoothGattCharacteristicClient()
 121           ->GetProperties(object_path_);
 122   if (!properties) {
 123     active_ = false;
 124     return;
 125   }
 126
 127   if (property_name == properties->notifying.name() &&
 128       !properties->notifying.value())
 129     active_ = false;
 130 }
 131
 132 }  // namespace chromeos