Design Patterns

Infographic: a booking request passes through the links of a chain — flight, seat availability, no-fly list, passport validity and total amount checks pass, and the chain stops at the promo code check
Aug 8, 2026 · 14 min

Chain of Responsibility: Turning Complex Rules Into a Pipeline

Splitting the seat, no-fly, passport, amount and promo checks of an airline booking into independent links of a chain, with Spring Boot.

Infographic: the Facade drawn as a single door in an airport terminal; the client walks in through that door, and behind it sit the payment system, ticket generation, baggage system, notification service and loyalty points
Aug 8, 2026 · 11 min

Facade Pattern: Hiding Complex Subsystems Behind One Door

The Facade Pattern does not remove complex subsystems. It hides them behind one door. Let’s see it in Spring Boot with a real airline booking scenario.

Infographic: a control tower in the middle standing for the Zustand store, surrounded by country selection, shipping method, payment method, order summary and coupon boxes — each connected only to the center, not to each other
Aug 8, 2026 · 10 min

Mediator Pattern: Managing the Mess Between React Components

Using the Mediator Pattern with Zustand on a checkout screen, where country, shipping, payment and coupon components all affect each other.