Refactor the windows policy provider to use AsynchronousPolicyProvider.

chrome/browser/policy/configuration_policy_loader_win.cc

+// Copyright (c) 2010 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 "chrome/browser/policy/configuration_policy_loader_win.h"
+
+#include <userenv.h>
+
+#include "chrome/browser/browser_thread.h"
+
+namespace policy {
+
+ConfigurationPolicyLoaderWin::ConfigurationPolicyLoaderWin(
+    AsynchronousPolicyProvider::Delegate* delegate,
+    int reload_interval_minutes)
+    : AsynchronousPolicyLoader(delegate, reload_interval_minutes),
+      user_policy_changed_event_(false, false),
+      machine_policy_changed_event_(false, false),
+      user_policy_watcher_failed_(false),
+      machine_policy_watcher_failed_(false) {
+  if (!RegisterGPNotification(user_policy_changed_event_.handle(), false)) {
+    PLOG(WARNING) << "Failed to register user group policy notification";
+    user_policy_watcher_failed_ = true;
+  }
+  if (!RegisterGPNotification(machine_policy_changed_event_.handle(), true)) {
+    PLOG(WARNING) << "Failed to register machine group policy notification.";
+    machine_policy_watcher_failed_ = true;
+  }
+}
+
+void ConfigurationPolicyLoaderWin::InitOnFileThread() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  AsynchronousPolicyLoader::InitOnFileThread();
+  MessageLoop::current()->AddDestructionObserver(this);
+  SetupWatches();
+}
+
+void ConfigurationPolicyLoaderWin::StopOnFileThread() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  MessageLoop::current()->RemoveDestructionObserver(this);
+  user_policy_watcher_.StopWatching();
+  machine_policy_watcher_.StopWatching();
+  AsynchronousPolicyLoader::StopOnFileThread();
+}
+
+void ConfigurationPolicyLoaderWin::SetupWatches() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  CancelReloadTask();
+
+  if (!user_policy_watcher_failed_ &&
+      !user_policy_watcher_.GetWatchedObject() &&
+      !user_policy_watcher_.StartWatching(
+          user_policy_changed_event_.handle(), this)) {
+    LOG(WARNING) << "Failed to start watch for user policy change event";
+    user_policy_watcher_failed_ = true;
+  }
+  if (!machine_policy_watcher_failed_ &&
+      !machine_policy_watcher_.GetWatchedObject() &&
+      !machine_policy_watcher_.StartWatching(
+          machine_policy_changed_event_.handle(), this)) {
+    LOG(WARNING) << "Failed to start watch for machine policy change event";
+    machine_policy_watcher_failed_ = true;
+   }
+
+  if (user_policy_watcher_failed_ || machine_policy_watcher_failed_)
+    ScheduleFallbackReloadTask();
+}
+
+void ConfigurationPolicyLoaderWin::Reload() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  AsynchronousPolicyLoader::Reload();
+  SetupWatches();
+}
+
+void ConfigurationPolicyLoaderWin::OnObjectSignaled(HANDLE object) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  DCHECK(object == user_policy_changed_event_.handle() ||
+         object == machine_policy_changed_event_.handle())
+      << "unexpected object signaled policy reload, obj = "
+      << std::showbase << std::hex << object;
+  Reload();
+}
+
+void ConfigurationPolicyLoaderWin::
+    WillDestroyCurrentMessageLoop() {
+  CancelReloadTask();
+  MessageLoop::current()->RemoveDestructionObserver(this);
+}
+
+}  // namespace policy