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#pragma once
#include "Api.h"
#include "IStorageBackend.h"
#include <cstdint>
#include <optional>
#include <string>
#include <unordered_map>
#include <vector>
/**
* @file InMemoryBackend.h
* @brief In-process KV storage backend backed by unordered_maps.
*/
namespace nt
{
/**
* @interface InMemoryBackend
* @brief IStorageBackend implementation that keeps all data in process memory.
*
* Intended for unit tests where SQLite is not appropriate. Data does not
* survive process exit and is not thread-safe.
*/
class NT_API InMemoryBackend : public IStorageBackend
{
public:
std::string Put(std::vector<uint8_t> value) override;
std::optional<std::vector<uint8_t>> Get(const std::string& hash) override;
void LinkTuple(const std::vector<std::string>& relation_path,
const std::string& tuple_hash) override;
std::vector<std::string> TupleHashes(const std::vector<std::string>& relation_path,
std::size_t offset,
std::size_t limit) override;
private:
std::unordered_map<std::string, std::vector<uint8_t>> kv_;
std::unordered_map<std::string, std::vector<std::string>> index_;
static std::string PathKey(const std::vector<std::string>& path);
};
}
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