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Mastering Clojure

You're reading from   Mastering Clojure Understand the philosophy of the Clojure language and dive into its inner workings to unlock its advanced features, methodologies, and constructs

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Product type Paperback
Published in Mar 2016
Publisher Packt
ISBN-13 9781785889745
Length 266 pages
Edition 1st Edition
Languages
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Author (1):
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Akhil Wali Akhil Wali
Author Profile Icon Akhil Wali
Akhil Wali
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Toc

Table of Contents (14) Chapters Close

Preface 1. Working with Sequences and Patterns FREE CHAPTER 2. Orchestrating Concurrency and Parallelism 3. Parallelization Using Reducers 4. Metaprogramming with Macros 5. Composing Transducers 6. Exploring Category Theory 7. Programming with Logic 8. Leveraging Asynchronous Tasks 9. Reactive Programming 10. Testing Your Code 11. Troubleshooting and Best Practices A. References
Index

Transducers in action

In this section, we will examine how transducers are implemented. We will also get a basic idea of how our own transducible source of data can be implemented.

Managing volatile references

Some transducers can internally use state. It turns out that the existing reference types, such as atoms and refs, aren't fast enough for the implementation of transducers. To circumvent this problem, transducers also introduce a new volatile reference type. A volatile reference represents a mutable variable that will not be copied into the thread-local cache. Also, volatile references are not atomic. They are implemented in Java using the volatile keyword with a java.lang.Object type.

Note

The following examples can be found in src/m_clj/c5/volatile.clj of the book's source code.

We can create a new volatile reference using the volatile! function. The value contained in the volatile state can then be retrieved using the @ reader macro or a deref form. The vreset! function can...

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