chrome/browser/sync/glue/history_model_worker.h

   1 // Copyright (c) 2012 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_SYNC_GLUE_HISTORY_MODEL_WORKER_H_
   6 #define CHROME_BROWSER_SYNC_GLUE_HISTORY_MODEL_WORKER_H_
   7
   8 #include "sync/internal_api/public/engine/model_safe_worker.h"
   9
  10 #include "base/basictypes.h"
  11 #include "base/callback_forward.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "base/memory/weak_ptr.h"
  15 #include "base/task/cancelable_task_tracker.h"
  16 #include "components/history/core/browser/history_db_task.h"
  17 #include "components/history/core/browser/history_service.h"
  18
  19 namespace history {
  20 class HistoryService;
  21 }
  22
  23 namespace browser_sync {
  24
  25 // A syncer::ModelSafeWorker for history models that accepts requests
  26 // from the syncapi that need to be fulfilled on the history thread.
  27 class HistoryModelWorker : public syncer::ModelSafeWorker {
  28  public:
  29   explicit HistoryModelWorker(
  30       const base::WeakPtr<history::HistoryService>& history_service,
  31       syncer::WorkerLoopDestructionObserver* observer);
  32
  33   // syncer::ModelSafeWorker implementation. Called on syncapi SyncerThread.
  34   void RegisterForLoopDestruction() override;
  35   syncer::ModelSafeGroup GetModelSafeGroup() override;
  36
  37   // Called on history DB thread to register HistoryModelWorker to observe
  38   // destruction of history backend loop.
  39   void RegisterOnDBThread();
  40
  41  protected:
  42   syncer::SyncerError DoWorkAndWaitUntilDoneImpl(
  43       const syncer::WorkCallback& work) override;
  44
  45  private:
  46   ~HistoryModelWorker() override;
  47
  48   const base::WeakPtr<history::HistoryService> history_service_;
  49   // Helper object to make sure we don't leave tasks running on the history
  50   // thread.
  51   scoped_ptr<base::CancelableTaskTracker> cancelable_tracker_;
  52   DISALLOW_COPY_AND_ASSIGN(HistoryModelWorker);
  53 };
  54
  55 }  // namespace browser_sync
  56
  57 #endif  // CHROME_BROWSER_SYNC_GLUE_HISTORY_MODEL_WORKER_H_