Crazy Maker Circle (Tech Freedom Architecture Circle): a community of tech enthusiasts, experts, and high‑performance fans. Many top‑level masters, architects, and hobbyists have achieved tech freedom; another wave of go‑getters are hustling hard toward tech freedom.
The article dissects MyBatis' mechanisms for preventing SQL injection, compares the safe #{ } syntax with the risky ${ } syntax, explains the underlying PreparedStatement workflow, and provides concrete best‑practice guidelines and code examples for secure usage.
The article explains why MyBatis can execute database queries without concrete method implementations by using JDK dynamic proxies, detailing the roles of MapperProxy, MapperMethod, SqlSession and Executor, and walks through the four‑step process from proxy creation to result mapping.
This article explains the inner workings of Java's ThreadLocal, why it fails to propagate context in asynchronous scenarios, compares manual passing and decorator‑based approaches, introduces the TransmittableThreadLocal (TTL) library with its CRER workflow, and provides a structured interview answer that showcases deep architectural insight.
When MySQL executes an UPDATE or DELETE that uses a column without an index, it must scan the entire table and acquires a combination of row, gap, and intention locks, which effectively blocks all other write operations and behaves like a table‑level lock, so adding proper indexes is essential.
This article breaks down Python’s Global Interpreter Lock, explains when to use multiprocessing, multithreading or asyncio, provides concrete performance benchmarks and a hybrid process‑coroutine pattern, and guides you on choosing the right concurrency model for interview questions.
This article provides a comprehensive technical guide to Elasticsearch’s core retrieval models—BM25 and TF‑IDF—while detailing modern vector‑based search using dense_vector, kNN, L2 and cosine distances, and demonstrates how to combine keyword and semantic results through hybrid search and Reciprocal Rank Fusion (RRF) with practical configuration examples.
The article presents a step‑by‑step, code‑driven design of a Spring Cloud SaaS multi‑tenant solution that balances resource sharing and strict data isolation by using a shared‑database, shared‑schema approach with tenant_id filtering, ThreadLocal context, MyBatis‑Plus interceptors, Redis key prefixing, Sa‑Token session segregation, and Spring Boot auto‑configuration.
This article walks through the design and implementation of a self‑developed Spring Cloud LoadBalancer starter that supports dynamic gray routing, explaining why the default round‑robin strategy is insufficient, dissecting Spring Cloud LoadBalancer internals, and providing step‑by‑step code, Nacos configuration, and verification scripts to achieve safe, weighted traffic shifting during releases.
This article presents a detailed design for a high‑concurrency (10‑100k QPS) distributed transaction solution that integrates RocketMQ transactional messages, an eBay‑style local message table, and XXL‑Job reconciliation to achieve eventual consistency while handling failures, retries, and data‑explosion challenges.
This article presents a complete, step‑by‑step analysis of a high‑concurrency Redis counter component that supports up to 100 000 QPS, covering business pain points, architectural design, two core counting strategies, sharding, local batch optimization, code walkthroughs, and performance benchmark results.
