Part 5. Enhanced Java concurrency

The fifth part of this book explores the more advanced ways of structuring concurrent programs in Java—beyond the ideas of easy-to-use parallel processing for streams introduced in chapters 6 and 7. Again, nothing in the rest of the book depends on this part, so do feel free to skip this part if you don’t (yet) need to explore these ideas.

Chapter 15 is new to this second edition and covers the “big-picture” idea of asynchronous APIs, including the ideas of Futures and the publish-subscribe protocol behind reactive programming and encapsulated in the Java 9 Flow API.

Chapter 16 explores CompletableFuture, which lets you express complex asynchronous computations in a declarative way—paralleling the design of the Streams API.

Chapter 17 is also new to this second edition and explores the Java 9 Flow API in detail, focusing on practical reactive programming code.