sapling/eden/fs/store/EmptyBackingStore.h

/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This software may be used and distributed according to the terms of the
 * GNU General Public License version 2.
 */

#pragma once

#include "BackingStore.h"
#include "eden/fs/store/ObjectFetchContext.h"

namespace facebook {
namespace eden {

/*
 * A dummy BackingStore implementation, that always throws std::domain_error
 * for any ID that is looked up.
 */
class EmptyBackingStore : public BackingStore {
 public:
  EmptyBackingStore();
  ~EmptyBackingStore() override;

  folly::SemiFuture<std::unique_ptr<Tree>> getTree(
      const Hash& id,
      ObjectFetchContext& context) override;
  folly::SemiFuture<std::unique_ptr<Blob>> getBlob(
      const Hash& id,
      ObjectFetchContext& context) override;
  folly::SemiFuture<std::unique_ptr<Tree>> getTreeForCommit(
      const Hash& commitID,
      ObjectFetchContext& context) override;
  folly::SemiFuture<std::unique_ptr<Tree>> getTreeForManifest(
      const Hash& commitID,
      const Hash& manifestID,
      ObjectFetchContext& context) override;
};
} // namespace eden
} // namespace facebook