Former Ant Group P8 engineer, pure technologist, sharing full‑stack Java, job interview and career advice through a column. Site: java-family.cn
This article explains how to use SpringBoot, AOP, and a custom annotation to dynamically switch between MySQL master and slave databases, automatically falling back to the master when a slave fails, and covers configuration, code implementation, and multi‑source extensions.
This article explains how to create a Spring Boot starter that lets you toggle between the native @Scheduled scheduler and XXL‑JOB at runtime via a configuration property, automatically scanning annotated methods, disabling Spring's tasks, and registering them as XXL‑JOB jobs with proper logging.
This article outlines ten crucial intermediate‑to‑advanced SQL techniques—including common table expressions, recursive CTEs, temporary functions, CASE‑WHEN pivots, EXCEPT vs NOT IN, self‑joins, ranking window functions, delta calculations, cumulative sums, and date‑time manipulation—providing explanations and practical query examples for data professionals.
Meteor, built on Alibaba's Arthas, is a non‑intrusive Java diagnostic console that lets developers monitor running applications, locate performance bottlenecks, memory leaks, and thread deadlocks without restarting services, offering a SpringBoot‑based architecture, quick start commands, and features such as class inspection, live code editing, method monitoring, thread management, and dashboards.
This article explores the drawbacks of static YAML files in production, compares traditional configuration centers, and presents a database‑driven approach that offers zero extra infrastructure, full control, and simplified architecture, while detailing layered bootstrapping, entity design, dynamic loading, encryption, versioning, and monitoring.
This article shows how to eliminate repetitive if…else statements in Java code by leveraging Java 8 functional interfaces such as Supplier, Consumer, Runnable, and custom interfaces for exception handling, branch processing, and null‑value handling, complete with code examples and diagrams.
This article explains how to enforce data‑access restrictions in MyBatis‑Plus by creating a custom @UserDataPermission annotation, building an InnerInterceptor that rewrites SQL queries, handling role‑based scopes, and integrating the interceptor into the MyBatis‑Plus plugin for both basic and advanced use cases.
This article introduces PowerJob, a young yet powerful distributed task scheduling framework, covering its selection reasons, core concepts, high‑availability setup, workflow types, scheduling modes, deployment steps, and detailed code examples for single, broadcast, map, and MapReduce jobs.
This article explains how to integrate Domain‑Driven Design's four‑layer architecture with microservice SDKs, outlines the structure and purpose of each layer, and introduces the D3boot framework and its modular components for building scalable backend systems efficiently.
This article provides a comprehensive guide to Redisson's distributed lock implementation, covering its architecture, comparison with Jedis and Lettuce, basic lock creation, Lua scripts for atomic operations, reentrant lock handling, watchdog-based lock renewal, RLock usage, and the design of fair locks using Redis data structures.
