Appendix E. Subsystem Façade Pattern Specification
Context
A set of database-stored business entities needs to be made accessible.
Problem
Database-stored business entities and services need to be exposed to remote clients. However, this could result in a tight coupling between the clients and the business entities, making maintenance or updates difficult. Also, having the database access code mixed with the business code would make the migration to a new database difficult.
Forces
• Simplify the interaction with clients external to the subsystem by hiding the complexity of the internal entities.
• Allow looser coupling with the database provider as data retrieval and updates are abstracted via JPA managers.
• Improve maintenance and portability ...
Get Patterns-Based Engineering: Successfully Delivering Solutions via Patterns now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
