Implemented Asynchronous Initialization of BluetoothAdapter.

device/bluetooth/bluetooth_task_manager_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "device/bluetooth/bluetooth_task_manager_win.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop.h"
 #include "base/sequenced_task_runner.h"
 #include "base/stringprintf.h"
 #include "base/sys_string_conversions.h"
 #include "base/threading/sequenced_worker_pool.h"
-#include "base/threading/thread_restrictions.h"
 #include "base/win/scoped_handle.h"
-#include "device/bluetooth/bluetooth_includes_win.h"
+#include "device/bluetooth/bluetooth_init_win.h"
 
 namespace {
 
 const int kNumThreadsInWorkerPool = 3;
 const char kBluetoothThreadName[] = "BluetoothPollingThreadWin";
 
-// A frame-based exception handler filter function for a handler for exceptions
-// generated by the Visual C++ delay loader helper function.
-int FilterVisualCPPExceptions(DWORD exception_code) {
-  return HRESULT_FACILITY(exception_code) == FACILITY_VISUALCPP ?
-      EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH;
-}  // namespace
-
 // Populates bluetooth adapter state using adapter_handle.
 void GetAdapterState(HANDLE adapter_handle,
                      device::BluetoothTaskManagerWin::AdapterState* state) {
   std::string name;
   std::string address;
   bool powered = false;
   BLUETOOTH_RADIO_INFO adapter_info = { sizeof(BLUETOOTH_RADIO_INFO), 0 };
   if (adapter_handle &&
       ERROR_SUCCESS == BluetoothGetRadioInfo(adapter_handle,
                                              &adapter_info)) {
@@ skipping 12 matching lines @@
   state->powered = powered;
 }
 
 }
 
 namespace device {
 
 // static
 const int BluetoothTaskManagerWin::kPollIntervalMs = 500;
 
-// static
-bool BluetoothTaskManagerWin::HasBluetoothStack() {
-  static enum {
-    HBS_UNKNOWN,
-    HBS_YES,
-    HBS_NO,
-  } has_bluetooth_stack = HBS_UNKNOWN;
-
-  if (has_bluetooth_stack == HBS_UNKNOWN) {
-    base::ThreadRestrictions::AssertIOAllowed();
-    HRESULT hr = E_FAIL;
-    __try {
-      hr = __HrLoadAllImportsForDll("bthprops.cpl");
-    } __except(FilterVisualCPPExceptions(::GetExceptionCode())) {
-      hr = E_FAIL;
-    }
-    has_bluetooth_stack = SUCCEEDED(hr) ? HBS_YES : HBS_NO;
-  }
-
-  return has_bluetooth_stack == HBS_YES;
-}
-
 BluetoothTaskManagerWin::BluetoothTaskManagerWin(
     scoped_refptr<base::SequencedTaskRunner> ui_task_runner)
     : ui_task_runner_(ui_task_runner),
       worker_pool_(new base::SequencedWorkerPool(kNumThreadsInWorkerPool,
                                                  kBluetoothThreadName)),
       bluetooth_task_runner_(
           worker_pool_->GetSequencedTaskRunnerWithShutdownBehavior(
               worker_pool_->GetSequenceToken(),
               base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN)) {
 }
@@ skipping 25 matching lines @@
   bluetooth_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&BluetoothTaskManagerWin::StartPolling,
                  this));
 }
 
 void BluetoothTaskManagerWin::StartPolling() {
   DCHECK(bluetooth_task_runner_->RunsTasksOnCurrentThread());
 
   // TODO(youngki): Handle this check where BluetoothAdapter is initialized.
-  if (HasBluetoothStack()) {
+  if (device::bluetooth_init_win::HasBluetoothStack()) {
     PollAdapter();
+  } else {
+    // IF the bluetooth stack is not available, we still send an empty state
+    // to BluetoothAdapter so that it is marked initialized, but the adapter
+    // will not be present.
+    AdapterState* state = new AdapterState();
+    ui_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&BluetoothTaskManagerWin::OnAdapterStateChanged,
+                 this,
+                 base::Owned(state)));
   }
 }
 
 void BluetoothTaskManagerWin::Shutdown() {
   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
   worker_pool_->Shutdown();
 }
 
 void BluetoothTaskManagerWin::PostSetPoweredBluetoothTask(
     bool powered,
@@ skipping 65 matching lines @@
         FROM_HERE,
         base::Bind(&BluetoothTaskManagerWin::OnAdapterStateChanged,
                    this,
                    base::Owned(state)));
     ui_task_runner_->PostTask(FROM_HERE, callback);
   } else {
     ui_task_runner_->PostTask(FROM_HERE, error_callback);
   }
 }
 
-}  // namespace device
+}  // namespace device