Chapter 15: Patterns: Tools, Not Dogma

Architectural patterns are solutions to recurring problems, not prescriptions. This chapter covers how to select patterns based on context, combine them appropriately, and recognize when a pattern is the wrong fit.

What this chapter covers

Microservices decomposition patterns
Saga pattern for distributed transactions
CQRS and event sourcing patterns
Sidecar and ambassador patterns
Strangler fig and anti-corruption layer patterns
API gateway and backend-for-frontend (BFF) patterns
How to recognize when a pattern is the wrong fit
Pattern combination and emergent complexity

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