Implemented BluetoothTaskManagerWin class.

device/bluetooth/bluetooth_polling_thread_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_polling_thread_win.h"
+
+#include <BluetoothAPIs.h>
+#if defined(_WIN32_WINNT_WIN8) && _MSC_VER < 1700
+// The Windows 8 SDK defines FACILITY_VISUALCPP in winerror.h.
+#undef FACILITY_VISUALCPP
+#endif
+#include <delayimp.h>
+#include <string>
+#include "base/message_loop.h"
+#include "base/stringprintf.h"
+#include "base/sys_string_conversions.h"
+#include "base/threading/thread_restrictions.h"
+#include "content/public/browser/browser_thread.h"
+#include "device/bluetooth/bluetooth_task_manager_win.h"
+
+#pragma comment(lib, "Bthprops.lib")
+#pragma comment(lib, "delayimp.lib")
+
+namespace {
+
+const char* kBluetoothManagerThreadName = "BluetoothPollingThreadWin";
+const BLUETOOTH_FIND_RADIO_PARAMS adapter_param =
+    { sizeof(BLUETOOTH_FIND_RADIO_PARAMS) };
+
+// A frame-based exception handler filter functionj for a handler for exceptions

[bryeung, 2012/12/19 19:15:42]

typo: "functionj"?

+// 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;
+}
+
+// Returns true if the machine has a bluetooth stack available. The first call
+// to this function will involve file IO, so it should be done on an
+// appropriate thread. This function is not threadsafe.
+//
+// TODO(youngki): Call this function when BluetoothAdapter is initialized. We
+// should disable Bluetooth support entirely if this function returns false.
+bool 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;
+}
+
+// Populates bluetooth adapter state using adapter_handle.
+void GetAdapterState(const 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)) {
+    name = base::SysWideToUTF8(adapter_info.szName);
+    address = base::StringPrintf("%02X:%02X:%02X:%02X:%02X:%02X",
+        adapter_info.address.rgBytes[5],
+        adapter_info.address.rgBytes[4],
+        adapter_info.address.rgBytes[3],
+        adapter_info.address.rgBytes[2],
+        adapter_info.address.rgBytes[1],
+        adapter_info.address.rgBytes[0]);
+    powered = !!BluetoothIsConnectable(adapter_handle);
+  }
+  state->name = name;
+  state->address = address;
+  state->powered = powered;
+}
+
+}  // namespace
+
+namespace device {
+
+// static
+const int BluetoothPollingThreadWin::kPollIntervalMs = 500;
+
+BluetoothPollingThreadWin::BluetoothPollingThreadWin(
+    BluetoothTaskManagerWin* task_manager)
+    : Thread(kBluetoothManagerThreadName),
+      task_manager_(task_manager) {
+}
+
+BluetoothPollingThreadWin::~BluetoothPollingThreadWin() {
+  DCHECK(task_manager_->ui_task_runner()->RunsTasksOnCurrentThread());
+  Cancel();
+}
+
+void BluetoothPollingThreadWin::StartPolling() {
+  if (!message_loop()) {
+    DCHECK(task_manager_->ui_task_runner()->RunsTasksOnCurrentThread());
+    Start();
+    message_loop()->PostTask(
+        FROM_HERE,
+        base::Bind(&BluetoothPollingThreadWin::PollAdapter,
+                   base::Unretained(this)));
+  }
+}
+
+// Cancels the pending tasks and waits until all the pending tasks in
+// BluetoothPollingThread finish.
+void BluetoothPollingThreadWin::Cancel() {
+  DCHECK(task_manager_->ui_task_runner()->RunsTasksOnCurrentThread());
+  cancellation_flag_.Set();
+  Stop();
+}
+
+void BluetoothPollingThreadWin::PollAdapter() {
+  DCHECK_EQ(message_loop(), MessageLoop::current());
+
+  if (cancellation_flag_.IsSet())
+    return;
+
+  HBLUETOOTH_RADIO_FIND adapter_handle = NULL;
+  HBLUETOOTH_RADIO_FIND handle = BluetoothFindFirstRadio(&adapter_param,
+                                                         &adapter_handle);
+  if (handle)
+    BluetoothFindRadioClose(handle);
+
+  BluetoothTaskManagerWin::AdapterState* state =
+      new BluetoothTaskManagerWin::AdapterState();
+  GetAdapterState(adapter_handle, state);
+
+  // Notify the UI thread of the Bluetooth Adapter state.
+  task_manager_->ui_task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&BluetoothTaskManagerWin::OnAdapterStateChanged,
+                 make_scoped_refptr(task_manager_),
+                 base::Owned(state)));
+
+  // Re-poll.
+  message_loop()->PostDelayedTask(
+      FROM_HERE,
+      base::Bind(&BluetoothPollingThreadWin::PollAdapter,
+                 base::Unretained(this)),
+      base::TimeDelta::FromMilliseconds(kPollIntervalMs));
+}
+
+}  // namespace device