Sharing over a decade of architecture experience from Baidu, Alibaba, and Tencent.
This guide explains the five ThreadPoolExecutor rejection policies in Java—AbortPolicy, CallerRunsPolicy, DiscardPolicy, DiscardOldestPolicy, and custom handlers—detailing their behavior, use‑cases, and providing concrete code examples for each.
This article explains what a queue is, classifies Java queue implementations—including blocking, non‑blocking, and double‑ended queues—provides detailed descriptions of each type, and offers code snippets and usage scenarios to help developers choose the right queue for their applications.
This article explains Java’s six thread states—NEW, RUNNABLE, BLOCKED, WAITING, TIMED_WAITING, and TERMINATED—using clear diagrams, concise descriptions, and practical code examples to help developers understand how threads transition during execution.
This article explains Java's HashMap implementation, covering its underlying array‑plus‑linked‑list (and tree) data structure, the hash function with bit‑mixing, collision handling via chaining, and the dynamic resizing mechanism triggered by load factor thresholds.
This article explains Spring's transaction mechanism, covering its reliance on database support, ACID properties, isolation levels, propagation attributes, programmatic and declarative management styles, and the underlying AOP implementation with concrete code examples.
