Book Image

Clojure High Performance Programming

By : Shantanu Kumar
Book Image

Clojure High Performance Programming

By: Shantanu Kumar

Overview of this book

<p>Clojure is a young, dynamic, functional programming language that runs on the Java Virtual Machine. It is built with performance, pragmatism, and simplicity in mind. Like most general purpose languages, Clojure’s features have different performance characteristics that one should know in order to write high performance code.<br /><br />Clojure High Performance Programming is a practical, to-the-point guide that shows you how to evaluate the performance implications of different Clojure abstractions, learn about their underpinnings, and apply the right approach for optimum performance in real-world programs.<br /><br />This book discusses the Clojure language in the light of performance factors that you can exploit in your own code.</p> <p>You will also learn about hardware and JVM internals that also impact Clojure’s performance. Key features include performance vocabulary, performance analysis, optimization techniques, and how to apply these to your programs. You will also find detailed information on Clojure's concurrency, state-management, and parallelization primitives.</p> <p>This book is your key to writing high performance Clojure code using the right abstraction, in the right place, using the right technique.</p>
Table of Contents (15 chapters)
Clojure High Performance Programming
Credits
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
Index

Java concurrent data structures


Java has a number of mutable data structures that are meant for concurrency and thread-safety, which implies multiple callers can safely access these data structures at the same time without blocking each other. When we need only highly concurrent access without state management, these data structures may be a very good fit. (several of these employ lock-free algorithms). We discussed Java atomic state classes in the Atomic updates and state section, so we will not repeat them here. Rather, we will only discuss the concurrent queues and other collections. All these data structures live in the java.util.concurrent package. These concurrent data structures are tailored to leverage the JSR 133 Java Memory Model and Thread Specification Revision implementation that first appeared in Java 5.

Concurrent maps

Java has a mutable concurrent hash-map, java.util.concurrent.ConcurrentHashMap (CHM for short). The concurrency level can be optionally specified when instantiating...