Implementing The Clean Architecture by Sebastian Buczyński

Author:Sebastian Buczyński
Language: eng
Format: epub
Published: 2020-08-21T00:00:00+00:00

Introducing Unit Of Work

Unit of Work is an abstraction over a so-called business transaction. Please do not confuse it with a database transaction which has a narrower scope. There is a lot of similarities, though - Unit of Work also groups a few operations to either succeed or fail as one. It is just

not restricted to the database queries.

Originally, Unit Of Work33 was only to track changes made on models to minimize the number of issued queries. In fact, advanced ORMs (like SQLAlchemy) implement such a mechanism. Our Unit of Work will be a bit more specialized, and it will expose four handy methods - begin, commit, rollback and register_callback_after_commit. Under the hood, it will call appropriate methods of a database transaction and maintain a list of scheduled callbacks:

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