chrome/browser/profiles/startup_task_runner_service.h

   1 // Copyright (c) 2013 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 #ifndef CHROME_BROWSER_PROFILES_STARTUP_TASK_RUNNER_SERVICE_H_
   6 #define CHROME_BROWSER_PROFILES_STARTUP_TASK_RUNNER_SERVICE_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/threading/non_thread_safe.h"
  11 #include "components/keyed_service/core/keyed_service.h"
  12
  13 class Profile;
  14
  15 namespace base {
  16 class DeferredSequencedTaskRunner;
  17 }  // namespace base
  18
  19 // This service manages the startup task runners.
  20 class StartupTaskRunnerService : public base::NonThreadSafe,
  21                                  public KeyedService {
  22  public:
  23   explicit StartupTaskRunnerService(Profile* profile);
  24   ~StartupTaskRunnerService() override;
  25
  26   // Returns sequenced task runner where all bookmarks I/O operations are
  27   // performed.
  28   // This method should only be called from the UI thread.
  29   // Note: Using a separate task runner per profile service gives a better
  30   // management of the sequence in which the task are started in order to avoid
  31   // congestion during start-up (e.g the caller may decide to start loading the
  32   // bookmarks only after the history finished).
  33   scoped_refptr<base::DeferredSequencedTaskRunner> GetBookmarkTaskRunner();
  34
  35   // Starts the task runners that are deferred during start-up.
  36   void StartDeferredTaskRunners();
  37
  38  private:
  39   Profile* profile_;
  40   scoped_refptr<base::DeferredSequencedTaskRunner> bookmark_task_runner_;
  41
  42   DISALLOW_COPY_AND_ASSIGN(StartupTaskRunnerService);
  43 };
  44
  45 #endif  // CHROME_BROWSER_PROFILES_STARTUP_TASK_RUNNER_SERVICE_H_