العمارة الطبقية وحدودها

في هذا الدرس

recognize what layering gives and where it breaks.

الموضوعات المخطط لها

• Layers: web → service → persistence; each layer calls the one below.
• Strength: simple, familiar, fast to start.
• Weakness: the database sits at the bottom, so the domain ends up shaped by tables and the ORM.
• Services become "transaction scripts" over anemic entities; business rules scatter.
• Tests need a database because the logic cannot be reached without it.