device/bluetooth/bluetooth_adapter_factory.cc

   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 "device/bluetooth/bluetooth_adapter_factory.h"
   6
   7 #include <vector>
   8
   9 #include "base/bind.h"
  10 #include "base/lazy_instance.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/memory/weak_ptr.h"
  13 #include "device/bluetooth/bluetooth_adapter.h"
  14
  15 #if defined(OS_MACOSX)
  16 #include "base/mac/mac_util.h"
  17 #endif
  18
  19 namespace device {
  20
  21 namespace {
  22
  23 // Shared default adapter instance.  We don't want to keep this class around
  24 // if nobody is using it, so use a WeakPtr and create the object when needed.
  25 // Since Google C++ Style (and clang's static analyzer) forbids us having
  26 // exit-time destructors, we use a leaky lazy instance for it.
  27 base::LazyInstance<base::WeakPtr<BluetoothAdapter> >::Leaky default_adapter =
  28     LAZY_INSTANCE_INITIALIZER;
  29
  30 #if defined(OS_WIN)
  31 typedef std::vector<BluetoothAdapterFactory::AdapterCallback>
  32     AdapterCallbackList;
  33
  34 // List of adapter callbacks to be called once the adapter is initialized.
  35 // Since Google C++ Style (and clang's static analyzer) forbids us having
  36 // exit-time destructors we use a lazy instance for it.
  37 base::LazyInstance<AdapterCallbackList> adapter_callbacks =
  38     LAZY_INSTANCE_INITIALIZER;
  39
  40 void RunAdapterCallbacks() {
  41   DCHECK(default_adapter.Get());
  42   scoped_refptr<BluetoothAdapter> adapter(default_adapter.Get().get());
  43   for (std::vector<BluetoothAdapterFactory::AdapterCallback>::const_iterator
  44            iter = adapter_callbacks.Get().begin();
  45        iter != adapter_callbacks.Get().end();
  46        ++iter) {
  47     iter->Run(adapter);
  48   }
  49   adapter_callbacks.Get().clear();
  50 }
  51 #endif  // defined(OS_WIN)
  52
  53 }  // namespace
  54
  55 // static
  56 bool BluetoothAdapterFactory::IsBluetoothAdapterAvailable() {
  57   // SetAdapterForTesting() may be used to provide a test or mock adapter
  58   // instance even on platforms that would otherwise not support it.
  59   if (default_adapter.Get())
  60     return true;
  61 #if defined(OS_CHROMEOS) || defined(OS_WIN)
  62   return true;
  63 #elif defined(OS_MACOSX)
  64   return base::mac::IsOSLionOrLater();
  65 #else
  66   return false;
  67 #endif
  68 }
  69
  70 // static
  71 void BluetoothAdapterFactory::GetAdapter(const AdapterCallback& callback) {
  72   DCHECK(IsBluetoothAdapterAvailable());
  73
  74 #if defined(OS_WIN)
  75   if (!default_adapter.Get()) {
  76     default_adapter.Get() =
  77         BluetoothAdapter::CreateAdapter(base::Bind(&RunAdapterCallbacks));
  78     DCHECK(!default_adapter.Get()->IsInitialized());
  79   }
  80
  81   if (!default_adapter.Get()->IsInitialized())
  82     adapter_callbacks.Get().push_back(callback);
  83 #else  // !defined(OS_WIN)
  84   if (!default_adapter.Get()) {
  85     default_adapter.Get() =
  86         BluetoothAdapter::CreateAdapter(BluetoothAdapter::InitCallback());
  87   }
  88
  89   DCHECK(default_adapter.Get()->IsInitialized());
  90 #endif  // defined(OS_WIN)
  91
  92   if (default_adapter.Get()->IsInitialized())
  93     callback.Run(scoped_refptr<BluetoothAdapter>(default_adapter.Get().get()));
  94
  95 }
  96
  97 // static
  98 void BluetoothAdapterFactory::SetAdapterForTesting(
  99     scoped_refptr<BluetoothAdapter> adapter) {
 100   default_adapter.Get() = adapter->GetWeakPtrForTesting();
 101 }
 102
 103 // static
 104 bool BluetoothAdapterFactory::HasSharedInstanceForTesting() {
 105   return default_adapter.Get();
 106 }
 107
 108 }  // namespace device