Dedicated to sharing programmer-architect skills—Java backend, system, microservice, and distributed architectures—to help you become a senior architect.
This article presents thirty practical SQL optimization tips, covering index usage, avoiding full‑table scans caused by operators like !=, NULL checks, OR, LIKE, IN, functions, and expressions, as well as best practices for temporary tables, cursors, and transaction size to improve database performance.
The article introduces OKHttpUtil, a lightweight wrapper around Square’s OkHttp library that enables Java developers to perform HTTP GET, POST, file upload, and download operations with a single line of code, includes Maven setup, Spring Boot integration, fluent API usage, and examples of wrapping external services such as eBay.
The article enumerates eight common MySQL query patterns—such as large‑offset LIMIT, implicit type conversion, sub‑query updates, mixed ordering, unnecessary EXISTS, poor condition push‑down, early range reduction, and inefficient intermediate result handling—and shows rewritten SQL that reduces execution time from seconds to milliseconds.
The article introduces a visual drag‑and‑drop data flow platform that unifies stream and batch processing, offers version control, automatic fault tolerance, configurable data permissions, comprehensive monitoring, data alignment, and query templates, and presents single‑instance performance benchmarks of over 30k and 60k ops/s.
This article walks developers through the OSI model, explains TCP's three‑way handshake and four‑way termination, contrasts TCP with UDP, addresses common networking questions, and details how to implement long‑lived socket connections and a reusable socket connection pool in Node.js.
The article examines the limitations of UUIDs for distributed systems, outlines the strict requirements for global unique IDs, compares common approaches such as database auto‑increment and Redis, and provides a detailed analysis of Twitter's Snowflake algorithm with its structure, Java implementation, advantages, drawbacks, and mitigation strategies.
This article walks through the reasons for abandoning Nacos in favor of Apollo and provides a step‑by‑step tutorial that covers Apollo’s core concepts, architecture, client integration with Spring Boot, dynamic updates, environment/cluster/namespace handling, and deployment on Kubernetes.
This article introduces Alibaba’s open‑source DataX tool, explains its framework‑plugin architecture for heterogeneous database sync, walks through Linux installation, job configuration, full‑ and incremental MySQL synchronization, and shares performance results and practical tips.
The article provides a side‑by‑side analysis of Spring AI 2.0 and LangChain4j, comparing their goals, version alignment, programming models, RAG and agent capabilities, ecosystem integration, learning curve, and operational considerations to help Java teams decide which library best fits their project constraints.
This article walks through using RSA to encrypt Spring Boot API responses, covering the theory behind RSA, two security scenarios, Maven dependency setup, configuration, controller annotations, encryption/decryption code, a front‑end JavaScript example, common pitfalls, and a final security summary.
