local_chunk_store.h

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/*
 * Copyright 2026 The A11 Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef A11_STORES_LOCAL_CHUNK_STORE_H_
#define A11_STORES_LOCAL_CHUNK_STORE_H_
 
#include <cstddef>
#include <cstdint>
#include <memory>
#include <optional>
#include <string>
#include <vector>
 
#include <absl/status/status.h>
#include <absl/status/statusor.h>
#include <absl/time/time.h>
 
#include "a11/concurrency/future.h"
#include "a11/data/types.h"
#include "a11/stores/chunk_store.h"
 
namespace a11::stores {
 
class LocalChunkStore final : public ChunkStore {
 private:
  struct State;
 
  struct ConstructorToken {};
 
 public:
  static absl::StatusOr<std::shared_ptr<LocalChunkStore>> Create(
      std::string node_id);
 
  ~LocalChunkStore() override = default;
 
  using ChunkStore::CloseWritesWithStatus;
  using ChunkStore::Get;
  using ChunkStore::GetByArrivalOrder;
  using ChunkStore::Next;
 
  [[nodiscard]] bool HoldsObjects() const override { return true; }
 
  // In-memory implementations of the ChunkStore contract; see chunk_store.h
  // for the semantics of each method.
  a11::Future<data::NodeFragment> Get(std::uint32_t seq,
                                      absl::Time deadline) override;
  a11::Future<data::NodeFragment> GetByArrivalOrder(
      std::uint64_t arrival_order, absl::Time deadline) override;
  a11::Future<std::vector<std::optional<data::NodeFragment>>> Next(
      absl::Time deadline, size_t limit) override;
 
  a11::Future<std::uint32_t> Put(data::NodeFragment fragment) override;
  a11::Future<std::vector<std::uint32_t>> PutMany(
      std::vector<data::NodeFragment> fragments) override;
  a11::Future<data::NodeFragment> ClearData(std::uint32_t seq) override;
  a11::Future<std::uint32_t> GetSeqForArrivalOrder(
      std::uint64_t arrival_order) override;
  a11::Future<std::optional<std::uint32_t>> GetFinalSeq() override;
  a11::Future<absl::Status> CloseWritesWithStatus(
      absl::Status status, bool return_status_if_already_closed) override;
  a11::Future<size_t> Size() override;
  absl::StatusOr<std::string> GetId() const override;
 
  explicit LocalChunkStore(ConstructorToken, std::shared_ptr<State> state)
      : state_(std::move(state)) {}
 
 private:
  std::shared_ptr<State> state_;
};
 
}  // namespace a11::stores
 
#endif  // A11_STORES_LOCAL_CHUNK_STORE_H_