Make largest_changestamp setter/getter asynchronous.

chrome/browser/ui/webui/chromeos/drive_internals_ui.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 "chrome/browser/ui/webui/chromeos/drive_internals_ui.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/format_macros.h"
@@ skipping 217 matching lines @@
                         const drive::DriveCacheEntry& cache_entry);
 
   // Called when GetFreeDiskSpace() is complete.
   void OnGetFreeDiskSpace(base::DictionaryValue* local_storage_summary);
 
   // Called when GetAccountMetadata() call to DriveService is complete.
   void OnGetAccountMetadata(
       google_apis::GDataErrorCode status,
       scoped_ptr<google_apis::AccountMetadataFeed> account_metadata);
 
+  // Callback for DriveFilesystem::GetMetadata for local update.
+  void OnGetFilesystemMetadataForLocal(
+      const drive::DriveFileSystemMetadata& metadata);
+
+  // Callback for DriveFilesystem::GetMetadata for local update.
+  void OnGetFilesystemMetadataForDeltaUpdate(
+      const drive::DriveFileSystemMetadata& metadata);
+
   // Called when the page requests periodic update.
   void OnPeriodicUpdate(const base::ListValue* args);
 
   // The number of pending ReadDirectoryByPath() calls.
   int num_pending_reads_;
   // The last event sent to the JavaScript side.
   int last_sent_event_id_;
 
   base::WeakPtrFactory<DriveInternalsWebUIHandler> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(DriveInternalsWebUIHandler);
@@ skipping 146 matching lines @@
     google_apis::DriveServiceInterface* drive_service) {
   DCHECK(drive_service);
 
   drive_service->GetAccountMetadata(
       base::Bind(&DriveInternalsWebUIHandler::OnGetAccountMetadata,
                  weak_ptr_factory_.GetWeakPtr()));
 }
 
 void DriveInternalsWebUIHandler::UpdateLocalMetadataSection(
     google_apis::DriveServiceInterface* drive_service) {
-  DCHECK(drive_service);
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  GetSystemService()->file_system()->GetMetadata(
+      base::Bind(&DriveInternalsWebUIHandler::OnGetFilesystemMetadataForLocal,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+void DriveInternalsWebUIHandler::OnGetFilesystemMetadataForLocal(
+    const drive::DriveFileSystemMetadata& metadata) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   base::DictionaryValue local_metadata;
-  const drive::DriveFileSystemMetadata metadata =
-      GetSystemService()->file_system()->GetMetadata();
   local_metadata.SetDouble("account-largest-changestamp-local",
                            metadata.largest_changestamp);
   local_metadata.SetBoolean("account-metadata-loaded", metadata.loaded);
   local_metadata.SetBoolean("account-metadata-refreshing", metadata.refreshing);
   web_ui()->CallJavascriptFunction("updateLocalMetadata", local_metadata);
 }
 
 void DriveInternalsWebUIHandler::UpdateDeltaUpdateStatusSection() {
-  const drive::DriveFileSystemMetadata metadata =
-      GetSystemService()->file_system()->GetMetadata();
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  GetSystemService()->file_system()->GetMetadata(
+      base::Bind(
+          &DriveInternalsWebUIHandler::OnGetFilesystemMetadataForDeltaUpdate,
+          weak_ptr_factory_.GetWeakPtr()));
+}
+
+void DriveInternalsWebUIHandler::OnGetFilesystemMetadataForDeltaUpdate(
+    const drive::DriveFileSystemMetadata& metadata) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   base::DictionaryValue delta_update_status;
   delta_update_status.SetBoolean("push-notification-enabled",
                                  metadata.push_notification_enabled);
   delta_update_status.SetInteger("polling-interval-sec",
                                  metadata.polling_interval_sec);
   delta_update_status.SetString(
       "last-update-check-time",
       google_apis::util::FormatTimeAsStringLocaltime(
           metadata.last_update_check_time));
@@ skipping 234 matching lines @@
       new ChromeWebUIDataSource(chrome::kChromeUIDriveInternalsHost);
   source->add_resource_path("drive_internals.css", IDR_DRIVE_INTERNALS_CSS);
   source->add_resource_path("drive_internals.js", IDR_DRIVE_INTERNALS_JS);
   source->set_default_resource(IDR_DRIVE_INTERNALS_HTML);
 
   Profile* profile = Profile::FromWebUI(web_ui);
   ChromeURLDataManager::AddDataSource(profile, source);
 }
 
 }  // namespace chromeos