Dedicated to sharing programmer-architect skills—Java backend, system, microservice, and distributed architectures—to help you become a senior architect.
This article explains Alibaba’s Java development guidelines for layered domain models, detailing the purpose and naming rules of DO, DTO, BO, AO, VO, and Query objects, and clarifies the roles of PO, VO, DAO, BO, DTO, and POJO in clean backend architecture.
This article explains the concept of software scaffolding, why it is essential for modern microservice development, and reviews popular scaffolding tools such as Spring Boot, Vue, Maven, Netty, Java EE, and Dropwizard, highlighting their benefits and practical usage.
This guide explains how to achieve pagination and multi‑condition fuzzy queries in Redis by leveraging ZSet for ordered paging and Hash with HSCAN for pattern matching, detailing command usage, combination strategies, and performance optimizations such as temporary set expiration and data freshness handling.
This article provides a detailed walkthrough of Spring's circular‑dependency resolution, explaining the three‑level cache mechanism, step‑by‑step bean creation flow, and the underlying source‑code logic, complete with diagrams and code examples for deep understanding.
This article explains why both front‑end and back‑end data validation are essential for modern web applications, outlines the specific checks each layer should perform, and describes the combined benefits for security, data integrity, and user experience.
This guide explains how to determine the heap memory consumption of individual HTTP and RPC calls in a SpringBoot application by setting up a JMeter load test, enabling detailed GC logging, and analyzing the results to optimize JVM parameters and improve performance.
To protect API traffic from scraping, tampering, replay attacks, and ensure data integrity, this guide outlines a hybrid encryption scheme that combines symmetric AES, asymmetric RSA, hash‑based signatures, and HTTPS principles, detailing design, implementation steps, common issues, and security analysis.
This article compares four pagination strategies—standard LIMIT/OFFSET, primary‑key filtering, has‑more scrolling, and Elasticsearch pagination—explaining their trade‑offs, performance impacts, and suitable use cases while providing concrete SQL and Java code examples.
This article explains the purpose of MySQL's optimizer_switch prefer_ordering_index, shows how it affects ORDER BY and GROUP BY queries with LIMIT, provides code examples and EXPLAIN output, and argues that disabling it often yields better performance for skewed data distributions.
This article traces the evolution from HTTP/1.1 to HTTP/3, explains how QUIC leverages UDP to achieve faster, secure connections, and details its handshake, connection migration, head‑of‑line blocking solutions, congestion and flow control mechanisms.
