device/bluetooth/bluetooth_socket_thread.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_socket_thread.h"
   6
   7 #include "base/lazy_instance.h"
   8 #include "base/sequenced_task_runner.h"
   9 #include "base/threading/thread.h"
  10
  11 namespace device {
  12
  13 base::LazyInstance<scoped_refptr<BluetoothSocketThread> > g_instance =
  14     LAZY_INSTANCE_INITIALIZER;
  15
  16 // static
  17 scoped_refptr<BluetoothSocketThread> BluetoothSocketThread::Get() {
  18   if (!g_instance.Get().get()) {
  19     g_instance.Get() = new BluetoothSocketThread();
  20   }
  21   return g_instance.Get();
  22 }
  23
  24 // static
  25 void BluetoothSocketThread::CleanupForTesting() {
  26   DCHECK(g_instance.Get());
  27   g_instance.Get() = NULL;
  28 }
  29
  30 BluetoothSocketThread::BluetoothSocketThread()
  31     : active_socket_count_(0) {}
  32
  33 BluetoothSocketThread::~BluetoothSocketThread() {
  34   if (thread_) {
  35     thread_->Stop();
  36     thread_.reset(NULL);
  37     task_runner_ = NULL;
  38   }
  39 }
  40
  41 void BluetoothSocketThread::OnSocketActivate() {
  42   DCHECK(thread_checker_.CalledOnValidThread());
  43   active_socket_count_++;
  44   EnsureStarted();
  45 }
  46
  47 void BluetoothSocketThread::OnSocketDeactivate() {
  48   DCHECK(thread_checker_.CalledOnValidThread());
  49   active_socket_count_--;
  50   if (active_socket_count_ == 0 && thread_) {
  51     thread_->Stop();
  52     thread_.reset(NULL);
  53     task_runner_ = NULL;
  54   }
  55 }
  56
  57 void BluetoothSocketThread::EnsureStarted() {
  58   DCHECK(thread_checker_.CalledOnValidThread());
  59   if (thread_)
  60     return;
  61
  62   base::Thread::Options thread_options;
  63   thread_options.message_loop_type = base::MessageLoop::TYPE_IO;
  64   thread_.reset(new base::Thread("BluetoothSocketThread"));
  65   thread_->StartWithOptions(thread_options);
  66   task_runner_ = thread_->message_loop_proxy();
  67 }
  68
  69 scoped_refptr<base::SequencedTaskRunner> BluetoothSocketThread::task_runner()
  70     const {
  71   DCHECK(active_socket_count_ > 0);
  72   DCHECK(thread_);
  73   DCHECK(task_runner_);
  74
  75   return task_runner_;
  76 }
  77
  78 }  // namespace device