Should the atomicity be part of the adapter?

I don't know how many databases support atomic operations, but it might make sense to move the atomicity requirement to the adapters. That way if a database supports atomic operations the core doesn't do any unnecessary work.

This probably depends quite highly on #19, as this is hard to write and prove without a good test suite if the database does not have atomic operations. We could also provide a wrapper to make generic, non-atomic put operations atomic to make that step easier.

まず issue #19 を確認し、put 操作用の既存の core とアダプターのエントリーポイントを特定します。現在どのように atomicity が保証されているか、またどのデータベースアダプターが atomic operation をサポートしているかを判断します。generic wrapper を含め、責任の所在が明確に割り当てられ、テスト戦略でカバーされていれば完了です。