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The article explains why long chains of if‑else are hard to maintain, proposes a rule‑engine architecture with abstract BaseRule, concrete rule classes, and a RuleService that supports AND/OR short‑circuit execution, and evaluates its advantages and drawbacks with Java code examples.
This article compares MySQL's JOIN and IN constructs, showing that IN can be slightly faster for simple filters while JOIN offers greater flexibility for complex, multi‑table queries, and it outlines when to use each approach along with additional optimization tips such as indexing and engine selection.
This tutorial walks through setting up Spring Cloud Sleuth with Spring Boot 2.6.8 and Spring Cloud 2021.0.3 to capture and visualize distributed trace data via Zipkin, covering project creation, Maven dependencies, YAML configuration, OpenFeign integration, exception handling, RabbitMQ transport, and logback pattern adjustments.
This guide introduces Lock4j, a versatile distributed‑lock component for Java that works with Spring AOP and supports RedisTemplate, Redisson, and Zookeeper, and walks through its features, configuration, annotation attributes, basic usage, and advanced customization options.
The article argues that systematic documentation is a strategic asset for startups, detailing how it eliminates guesswork, accelerates onboarding, reduces unnecessary meetings, and fosters a culture of shared knowledge, while also acknowledging its limits and the resistance it may face.
The article explains how to safely upgrade services by using gray (canary) release strategies with Spring Cloud Gateway, compares rolling and blue‑green deployments, and demonstrates weight‑based routing, hint‑based routing, and custom ServiceInstanceListSupplier implementations to control traffic between old and new service versions.
The article explains how to use Redis Sorted Sets for efficient pagination, employ Hashes with HSCAN for multi‑condition fuzzy matching, combine both techniques into a unified solution, and apply expiration‑based optimizations to keep the cache lightweight and responsive.
This article explains Lua fundamentals, why Lua is advantageous inside Redis, common use‑cases such as cache updates and distributed locks, and provides step‑by‑step guidance for integrating and executing Lua scripts in a Spring Boot application to improve performance and ensure atomicity.
This article explains the concept of idempotency, why it matters for HTTP APIs, the impact on system design, RESTful method characteristics, and compares four practical implementation strategies—including database primary keys, optimistic locking, Redis token, and downstream sequence numbers—followed by a complete SpringBoot example with code and tests.
This article walks through implementing dynamic data‑source switching in SpringBoot by combining ThreadLocal with AbstractRoutingDataSource, covering manual code, configuration, annotation‑driven AOP, and runtime addition of new data sources, complete with test cases and sample code.
