components/download/internal/background_service/noop_store.h

// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_DOWNLOAD_INTERNAL_BACKGROUND_SERVICE_NOOP_STORE_H_
#define COMPONENTS_DOWNLOAD_INTERNAL_BACKGROUND_SERVICE_NOOP_STORE_H_

#include "base/memory/weak_ptr.h"
#include "components/download/internal/background_service/store.h"

namespace download {

struct Entry;

// A Store implementation that doesn't do anything but honors the interface
// requirements. Used in incognito mode without any database IO.
class NoopStore : public Store {
 public:
  NoopStore();

  NoopStore(const NoopStore&) = delete;
  NoopStore& operator=(const NoopStore&) = delete;

  ~NoopStore() override;

  // Store implementation.
  bool IsInitialized() override;
  void Initialize(InitCallback callback) override;
  void HardRecover(StoreCallback callback) override;
  void Update(const Entry& entry, StoreCallback callback) override;
  void Remove(const std::string& guid, StoreCallback callback) override;

 private:
  void OnInitFinished(InitCallback callback);

  // Whether or not this Store is 'initialized.'  Just gets set to |true| once
  // Initialize() is called.
  bool initialized_;

  base::WeakPtrFactory<NoopStore> weak_ptr_factory_{this};
};

}  // namespace download

#endif  // COMPONENTS_DOWNLOAD_INTERNAL_BACKGROUND_SERVICE_NOOP_STORE_H_