Dedicated to sharing programmer-architect skills—Java backend, system, microservice, and distributed architectures—to help you become a senior architect.
A senior Java engineer recounts how a team evolved from a MyBatis interceptor for environment-based data isolation to a clean annotation-plus-AOP solution after a junior developer's ThreadLocal-based quick fix caused nested-call bugs and scattered boilerplate across the codebase.
Manticore Search, a C++-based search engine forked from Sphinx, claims to outperform Elasticsearch by up to 15x on small datasets and 4x on large data, offering SQL syntax, MySQL protocol compatibility, real-time inserts, and built-in replication while using minimal memory.
This article explains the critical behavioral difference when placing try-catch inside versus outside a for loop: outside placement terminates the loop on exception, while inside allows continuation. It also analyzes performance implications, showing negligible overhead when no exceptions occur but increased memory consumption if many iterations throw exceptions, and details the JVM exception table mechanics that underlie this behavior.
This article explains distributed transaction concepts, CAP theorem trade-offs, and three solutions: two-phase commit (2PC), try-confirm-cancel (TCC), and message queue-based eventual consistency with idempotency requirements.
The article compares three approaches to restrict APIs to internal-only access in microservices: service isolation, gateway whitelist with Redis, and a gateway-plus-AOP solution that adds a header at the gateway and validates it via annotation-driven aspect, favoring the latter for performance and developer efficiency.
DC3 is a distributed, open-source IoT platform built on Spring Cloud that enables rapid development and device management through a four-layer architecture covering drivers, data, management, and applications with Kubernetes and Docker support.
This article explains the GeoHash algorithm, detailing how it converts latitude/longitude into binary strings via recursive bisection, interleaves bits, applies base32 encoding, and uses prefix matching to efficiently find nearby passengers in ride-hailing apps, while noting edge-case limitations.
This article explains how to implement Single Sign-On (SSO) using CAS to unify authentication across multiple company systems, covering session mechanics, cluster session sharing with Redis, and providing complete Spring Boot code examples for both the CAS server and client applications.
This article demonstrates how to implement dynamic data source switching in Spring Boot using ThreadLocal and AbstractRoutingDataSource, covering configuration, annotation-based switching, and runtime data source registration with Druid.
This article compares polling, WebSocket, and Server-Sent Events (SSE) for server-to-client real-time messaging, detailing SSE's lightweight HTTP-based design, automatic reconnection, and simpler server requirements, then provides a complete Node.js/Express and vanilla HTML/JavaScript demo.
