ABAP OOP Design Patterns — Part 2: Factory, Observer, and Decorator Patterns in Real SAP Systems。
If you’ve been writing ABAP long enough, you’ve probably inherited a codebase where every business rule is buried inside a 3,000-line function module, and adding a new requirement means copy-pasting logic you’re not even sure is correct。
That’s not a skills problem — it’s an architecture problem。
In Part 1 of this series, we explored how the Strategy Pattern helps you swap business logic cleanly without touching the calling code。
Now it’s time to go further。
Before we dive in, a quick note: these patterns aren’t academic exercises。
来源：Dev.to
