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// 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.
#ifndef CHROME_BROWSER_SYNC_GLUE_HISTORY_MODEL_WORKER_H_
#define CHROME_BROWSER_SYNC_GLUE_HISTORY_MODEL_WORKER_H_
#include "sync/internal_api/public/engine/model_safe_worker.h"
#include "base/basictypes.h"
#include "base/callback_forward.h"
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/task/cancelable_task_tracker.h"
#include "chrome/browser/history/history_service.h"
#include "components/history/core/browser/history_db_task.h"
class HistoryService;
namespace browser_sync {
// A syncer::ModelSafeWorker for history models that accepts requests
// from the syncapi that need to be fulfilled on the history thread.
class HistoryModelWorker : public syncer::ModelSafeWorker {
public:
explicit HistoryModelWorker(
const base::WeakPtr<HistoryService>& history_service,
syncer::WorkerLoopDestructionObserver* observer);
// syncer::ModelSafeWorker implementation. Called on syncapi SyncerThread.
void RegisterForLoopDestruction() override;
syncer::ModelSafeGroup GetModelSafeGroup() override;
// Called on history DB thread to register HistoryModelWorker to observe
// destruction of history backend loop.
void RegisterOnDBThread();
protected:
syncer::SyncerError DoWorkAndWaitUntilDoneImpl(
const syncer::WorkCallback& work) override;
private:
~HistoryModelWorker() override;
const base::WeakPtr<HistoryService> history_service_;
// Helper object to make sure we don't leave tasks running on the history
// thread.
scoped_ptr<base::CancelableTaskTracker> cancelable_tracker_;
DISALLOW_COPY_AND_ASSIGN(HistoryModelWorker);
};
} // namespace browser_sync
#endif // CHROME_BROWSER_SYNC_GLUE_HISTORY_MODEL_WORKER_H_
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