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Clojure Programming Cookbook

You're reading from   Clojure Programming Cookbook Handle every problem you come across in the world of Clojure programming with this expert collection of recipes

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Product type Paperback
Published in Oct 2016
Publisher Packt
ISBN-13 9781785885037
Length 618 pages
Edition 1st Edition
Languages
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Authors (2):
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Nicolas Modrzyk Nicolas Modrzyk
Author Profile Icon Nicolas Modrzyk
Nicolas Modrzyk
Makoto Hashimoto Makoto Hashimoto
Author Profile Icon Makoto Hashimoto
Makoto Hashimoto
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Toc

Table of Contents (11) Chapters Close

Preface 1. Live Programming with Clojure FREE CHAPTER 2. Interacting with Collections 3. Clojure Next 4. File Access and the Network 5. Working with Other Languages 6. Concurrency and Parallelism 7. Advanced Tips 8. Web Applications 9. Testing 10. Deployment and DevOps

Solving concurrent problems using Clojure


In this recipe, we will learn Clojure's atoms, refs, and agents. Then we will have a look at Clojure's parallel features.

Getting ready

In this recipe, we will not use an external library. So, the only necessary thing is to start REPL to run code.

How to do it...

Clojure provides solutions for the concurrency problem. Clojure's vars defined in def are ensured only in single thread and are not safe in concurrent environments. Clojure provides three types of resources for concurrent problem. Here, we will introduce you atoms, refs, and agents that work in concurrent environments.

Using atoms

Atoms provide a way to manage shared, synchronous, and independent states.

Creating and referring atom

The atom function sets the initial value to atom. The following code initializes the atom to 1 and sets the atom to the var x:

(def x (atom 1)) 
;;=? #'chapter06.concurrency/x 

So, the value of x binds to Atom instance:

x 
;;=> #<Atom@541e8f8d: 1> 

To see the values...

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