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Clojure Reactive Programming

Clojure Reactive Programming

By : Leonardo Borges
4.3 (13)
Buy this Book
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Clojure Reactive Programming

Clojure Reactive Programming

4.3 (13)
By: Leonardo Borges
Buy this Book

Overview of this book

If you are a Clojure developer who is interested in using Reactive Programming to build asynchronous and concurrent applications, this book is for you. Knowledge of Clojure and Leiningen is required. Basic understanding of ClojureScript will be helpful for the web chapters, although it is not strictly necessary.
Table of Contents (13 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. What is Reactive Programming?
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1. What is Reactive Programming?
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A taste of Reactive Programming
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A bit of history
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Signals and events
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Implementation challenges
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Applications of FRP
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Summary
2
2. A Look at Reactive Extensions
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2. A Look at Reactive Extensions
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The Observer pattern revisited
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Creating Observables
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Manipulating Observables
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Flatmap and friends
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Error handling
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Backpressure
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Summary
3
3. Asynchronous Programming and Networking
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3. Asynchronous Programming and Networking
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Building a stock market monitoring application
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Rolling averages
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Identifying problems with our current approach
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Removing incidental complexity with RxClojure
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Summary
4
4. Introduction to core.async
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4. Introduction to core.async
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Asynchronous programming and concurrency
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core.async
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Rewriting the stock market application with core.async
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Error handling
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Backpressure
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Transducers
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Summary
5
5. Creating Your Own CES Framework with core.async
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5. Creating Your Own CES Framework with core.async
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A minimal CES framework
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Exercises
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A respondent application
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CES versus core.async
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Summary
6
6. Building a Simple ClojureScript Game with Reagi
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6. Building a Simple ClojureScript Game with Reagi
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Setting up the project
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Reagi and other CES frameworks
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Summary
7
7. The UI as a Function
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7. The UI as a Function
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The problem with complex web UIs
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Enter React.js
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ClojureScript and Om
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Building a simple Contacts application with Om
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Intercomponent communication
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Exercises
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Summary
8
8. Futures
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8. Futures
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Clojure futures
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Fetching data in parallel
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Imminent – a composable futures library for Clojure
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The movies example revisited
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Futures and blocking IO
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Summary
9
9. A Reactive API to Amazon Web Services
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9. A Reactive API to Amazon Web Services
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The problem
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Infrastructure automation
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AWS resources dashboard
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CloudFormation
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EC2
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RDS
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Designing the solution
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Exercises
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Summary
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A. The Algebra of Library Design
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A. The Algebra of Library Design
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The semantics of map
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Finding the average of ages
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Applicative Functors
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Gathering stats about ages
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Monads
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Summary
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B. Bibliography
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B. Bibliography
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Index
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Index

Chapter 3. Asynchronous Programming and Networking

Several business applications need to react to external stimuli—such as network traffic—asynchronously. An example of such software might be a desktop application that allows us to track a company's share prices in the stock market.

We will build this application first using a more traditional approach. In doing so, we will:

  • Be able to identify and understand the drawbacks of the first design
  • Learn how to use RxClojure to deal with stateful computations such as rolling averages
  • Rewrite the example in a declarative fashion using observable sequences, thus reducing the complexity found in our first approach
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Tech Concepts
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Programming languages
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