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Clojure Reactive Programming

You're reading from   Clojure Reactive Programming Design and implement highly reusable reactive applications by integrating different frameworks with Clojure

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Product type Paperback
Published in Mar 2015
Publisher Packt
ISBN-13 9781783986668
Length 232 pages
Edition 1st Edition
Languages
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Author (1):
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Leonardo Borges Leonardo Borges
Author Profile Icon Leonardo Borges
Leonardo Borges
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Toc

Table of Contents (13) Chapters Close

Preface 1. What is Reactive Programming? FREE CHAPTER 2. A Look at Reactive Extensions 3. Asynchronous Programming and Networking 4. Introduction to core.async 5. Creating Your Own CES Framework with core.async 6. Building a Simple ClojureScript Game with Reagi 7. The UI as a Function 8. Futures 9. A Reactive API to Amazon Web Services A. The Algebra of Library Design B. Bibliography
Index

Clojure futures


The first step toward fixing this issue—that is, to prevent a potentially long-running task from blocking our application—is to create new threads, which do the work and wait for it to complete. This way, we keep the application's main thread free to serve more clients.

Working directly with threads, however, is tedious and error-prone, so Clojure's core library includes futures, which are extremely simple to use:

(def f (clojure.core/future
         (println "doing some expensive work...")
         (Thread/sleep 5000)
         (println "done")
         10))
(println "You'll see me before the future finishes")
;; doing some expensive work...
;; You'll see me before the future finishes
;; done

In the preceding snippet, we invoke the clojure.core/future macro with a body simulating an expensive computation. In this example, it simply sleeps for 5 seconds before returning the value 10. As the output demonstrates, this does not block the main thread, which is free to serve more...

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