The Strangler Fig Pattern for Incremental Modernization
Use the Strangler Fig pattern to replace legacy capabilities incrementally with routing, data ownership, observability, and rollback plans.
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Structural Patterns: Compose Objects and Interfaces
Compare Adapter, Bridge, Composite, Decorator, Facade, Flyweight, and Proxy with Java examples, costs, failure modes, and guidance for choosing a fit.
Tell, Don't Ask and the Law of Demeter
Apply Tell, Don't Ask and the Law of Demeter to keep object rules near their data, reduce fragile navigation, and see when a direct query is clearer in context.
Testable Object Design and Collaborator Seams
Learn to design object-oriented code around behavior, collaborator boundaries, and stable dependency seams, with practical tests that resist refactoring churn.
Value Objects, Entities, and Aggregates
Learn how identity, value equality, and aggregate boundaries shape a reliable order model, with Java code, trade-offs, failure cases, and design checks.
Network Encapsulation: Follow a Packet Across the Stack
Follow an HTTPS request from a browser through transport, IP, and link layers, and learn how headers, MTU, routers, and packet captures fit together.
Ethernet, ARP, and Neighbor Discovery Explained
Learn how Ethernet frames, switches, VLANs, ARP, and IPv6 Neighbor Discovery deliver packets on a local link, with Linux diagnostics and failure examples.
Event Envelopes and Metadata for Reliable EDA
Learn how event envelopes separate transport context from payload, apply CloudEvents attributes, propagate correlation IDs, and validate messages safely.
Event Security and Sensitive Data in EDA
Secure event-driven systems with least-privilege identities, encrypted transport and payloads, careful data minimization, and a deliberate retention plan.
Forward and Reverse Proxies: Routing, Trust, and Use Cases
Learn how forward and reverse proxies handle HTTP traffic, CONNECT tunnels, TLS termination, caching, routing, trusted headers, and production failures.