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Hands-On Reactive Programming with Clojure

You're reading from   Hands-On Reactive Programming with Clojure Create asynchronous, event-based, and concurrent applications

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Product type Paperback
Published in Jan 2019
Publisher Packt
ISBN-13 9781789346138
Length 298 pages
Edition 2nd Edition
Languages
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Authors (2):
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Leonardo Borges Leonardo Borges
Author Profile Icon Leonardo Borges
Leonardo Borges
Konrad Szydlo Konrad Szydlo
Author Profile Icon Konrad Szydlo
Konrad Szydlo
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Table of Contents (15) Chapters Close

Preface 1. What is Reactive Programming? 2. A Look at Reactive Extensions FREE CHAPTER 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. A New Approach to Futures 9. A Reactive API to Amazon Web Services 10. Reactive Microservices 11. Testing Reactive Apps 12. Concurrency Utilities in Clojure 13. Other Books You May Enjoy Appendix - The Algebra of Library Design

The movies example revisited

Still within our imminent-playground project, open the src/imminent_playground/core.clj file and add the appropriate definitions:

(ns imminent-playground.core 
  (:require [clojure.pprint :refer [pprint]] 
            [imminent.core :as i])) 
 
(def movie ...) 
 
(def actor-movies ...) 
 
(def actor-spouse ...) 
 
(def top-5-movies ...) 

We will be using the same data as in the previous program, which is represented in the preceding snippet by the use of ellipses. Simply copy the relevant declarations over.

The service functions will need small tweaks in this new version:

(defn cast-by-movie [name] 
  (i/future (do (Thread/sleep 5000) 
                (:cast  movie)))) 
 
(defn movies-by-actor [name] 
  (i/future (do (Thread/sleep 2000) 
                (->> actor-movies 
                     (filter #(= name (:name %))) 
                   ...
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