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 "chrome/browser/common/cancelable_request.h"
  16 #include "chrome/browser/history/history_db_task.h"
  17 #include "chrome/browser/history/history_service.h"
  18
  19 class HistoryService;
  20
  21 namespace browser_sync {
  22
  23 // A syncer::ModelSafeWorker for history models that accepts requests
  24 // from the syncapi that need to be fulfilled on the history thread.
  25 class HistoryModelWorker : public syncer::ModelSafeWorker {
  26  public:
  27   explicit HistoryModelWorker(
  28       const base::WeakPtr<HistoryService>& history_service,
  29       syncer::WorkerLoopDestructionObserver* observer);
  30
  31   // syncer::ModelSafeWorker implementation. Called on syncapi SyncerThread.
  32   virtual void RegisterForLoopDestruction() OVERRIDE;
  33   virtual syncer::ModelSafeGroup GetModelSafeGroup() OVERRIDE;
  34
  35   // Called on history DB thread to register HistoryModelWorker to observe
  36   // destruction of history backend loop.
  37   void RegisterOnDBThread();
  38
  39  protected:
  40   virtual syncer::SyncerError DoWorkAndWaitUntilDoneImpl(
  41       const syncer::WorkCallback& work) OVERRIDE;
  42
  43  private:
  44   virtual ~HistoryModelWorker();
  45
  46   const base::WeakPtr<HistoryService> history_service_;
  47   // Helper object to make sure we don't leave tasks running on the history
  48   // thread.
  49   CancelableRequestConsumerT<int, 0> cancelable_consumer_;
  50   DISALLOW_COPY_AND_ASSIGN(HistoryModelWorker);
  51 };
  52
  53 }  // namespace browser_sync
  54
  55 #endif  // CHROME_BROWSER_SYNC_GLUE_HISTORY_MODEL_WORKER_H_