E‑commerce, SaaS, AI architect; DDD enthusiast; SKILL enthusiast
After a week-long series of experiments measuring TCP connections in various states—including ESTABLISH, client‑to‑server, server‑to‑client, and non‑ESTABLISH scenarios—the author quantifies per‑connection memory usage and shows how modern kernels reclaim buffers and reduce overhead, especially for TIME_WAIT.
The article demonstrates how to create a custom @ValidShop annotation and an AOP aspect that intercepts Spring MVC controller methods, extracts the annotated parameter via reflection, validates the shop code through a helper service, and proceeds only when the check succeeds.
The biggest challenge for software engineers isn’t writing code but continuously questioning requirements, clarifying details, uncovering the real problem behind requests, and understanding the people behind the system, a mindset the article calls “upstream thinking.”
The article compares three approaches—synchronous dual write, asynchronous dual write with a message queue, and CDC via Canal—to keep Elasticsearch and a relational database consistent for cross‑database aggregated full‑text search, outlining their steps, advantages, and drawbacks.
The article outlines the evolution of microservice architecture, its advantages, four concrete design principles—including AKF splitting, front‑end/back‑end separation, stateless services, and RESTful communication—while also discussing common challenges and practical mitigation strategies.
The article examines two ways to define Feign interfaces in a microservice architecture—having the service producer define the Feign client (SPI) versus letting the service consumer define it (API)—and compares their constraints, flexibility, dependency management, and impact on development workflow.
This article analyzes three implementation scenarios for silently printing PDF procurement lists in a shipping process, compares PDF‑related technologies on stability, integration and cost, and concludes with a Lodop‑based solution that converts backend data into a hidden canvas for direct printing.
This guide shares practical interview techniques for IT candidates, covering career positioning, mindset, the interviewer's evaluation criteria, effective self‑introduction, structured project storytelling, and answering technical questions to demonstrate depth and business impact.
