xiaofucode.com – a programmer learning guide driven by the pursuit of profit
The article explains four ways to undo code that has already been pushed to a remote Git repository—including manual diff deletion, using git revert, creating a new branch, and resetting the current branch—detailing each method’s steps, trade‑offs, and safety considerations.
The article walks through the motivations for strict permission management, explains how to structure menus, buttons, and roles into a tree, explores classic RBAC, role inheritance, constrained RBAC, user groups, organizations and positions, and finally shows how to model these concepts in database tables.
SpringBoot’s out‑of‑the‑box defaults—such as Tomcat’s tiny connection pool, HikariCP’s 10‑thread limit, lazy‑loaded JPA entities, system‑timezone JSON serialization, un‑rolled Logback files, unlimited in‑memory cache, exposed Actuator endpoints, tiny file‑upload limits, per‑task thread creation for @Async, and unlimited transaction timeouts—can silently cripple production systems, so each must be reviewed and tuned for real‑world workloads.
This article examines six practical techniques for measuring the latency of online interfaces in Java, from simple System.currentTimeMillis() calls to advanced AOP, interceptors, filters, and production‑grade monitoring tools like Micrometer and APM, comparing their precision, intrusiveness, and suitable scenarios.
Kafka consumer issues such as message backlog, duplicate processing, and data loss often stem from consumer group rebalances triggered by changes in consumer count, partition count, subscription topics, or heartbeat and poll timeouts, and can be mitigated by tuning timeout settings, managing offset commits, and using sticky partition assignment.
GitButler introduces virtual branches that let developers work on multiple features simultaneously without switching physical branches, offering parallel development, smart change attribution, real-time conflict detection, AI-assisted commit generation, drag-and-drop commit management, seamless conversion to real branches, deep GitHub integration, and workflow optimizations for faster bug fixes and exploratory coding.
A mis‑configured Nacos registration flag turned a payment service into a persistent instance, preventing unhealthy nodes from being removed and causing the entire payment chain to fail; the article explains the fundamental differences between registration and configuration centers and when to use temporary versus persistent instances.
Redis implements an approximate LRU using random sampling and timestamps, while classic LRU relies on exact access order; the article explains both LRU and LFU fundamentals, their Java implementations, Redis-specific variants, trade‑offs, use‑case recommendations, and configuration tips for selecting the optimal eviction policy.
This article compares Single Sign‑On (SSO) and OAuth2.0, detailing their conceptual distinctions, token‑based workflows, implementation frameworks like CAS, the four OAuth2.0 grant types, and how each can be used to achieve seamless authentication across applications.
The article walks through a year‑long investigation of a 404 error that appears after updating Nacos dynamic routing in Spring Cloud Gateway 3.0.1, explains how stale weight caches cause the failure, and presents a custom event‑listener solution that synchronizes the gateway's weight cache with the latest Nacos configuration.
