Java Asynchronous Programming in Practice

Java Asynchronous Programming in Practice is a systematic technical monograph by Zhai Luxu (known as "Jiaduo"), a senior Java engineer at Taobao, published in the "Java Core Technology Series" of China Machine Press. The book has nine chapters, built around a single thread: how to write asynchronous code correctly in high-concurrency, high-throughput scenarios. It proceeds layer by layer, from the language level to the JDK, frameworks, and middleware. The first two chapters clarify the concept, value, and typical use cases of asynchronous programming, then explain the most basic explicit threads and thread pools and analyze the costs and limitations behind implementations such as ThreadPoolExecutor. Chapter 3 goes deep into the JDK Future system, covering the usage and internals of Future, FutureTask, and CompletableFuture, and how to build asynchronous pipelines with Java 8 Stream. Chapter 4 turns to Spring's asynchronous execution capabilities, explaining the TaskExecutor abstraction, the @Async annotation, and the proxy and thread-pool mechanisms behind it. Chapter 5 introduces reactive programming, covering the Reactive Streams specification and the asynchronous implementations of RxJava and Reactor. Chapters 6 and 7 discuss asynchronous non-blocking processing in Web Servlet 3.0/3.1 and Spring WebFlux introduced in Spring 5.0, including concurrency models, the two programming models, and internal implementation principles. Chapter 8 surveys asynchronous design ideas in frameworks and middleware such as Netty, Apache Dubbo, Disruptor, Akka, and Apache RocketMQ. Chapter 9 uses Go's goroutines and channels as a reference to explain differences in native asynchronous capabilities at the language level. The book includes companion sample code (open-sourced on GitHub) and emphasizes combining principles with runnable code. It suits Java developers who want to move from using asynchronous APIs to understanding the essence of asynchrony.