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Clojure Reactive Programming

Book Image

Clojure Reactive Programming

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Clojure Reactive Programming
Mar, 2015 | 232 pages
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Table of Contents (19 chapters)
Clojure Reactive Programming
Clojure Reactive Programming
Credits
Credits
About the Author
About the Author
Acknowledgments
Acknowledgments
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
What is Reactive Programming?
What is Reactive Programming?
A taste of Reactive Programming
A bit of history
Signals and events
Implementation challenges
Applications of FRP
Summary
2
A Look at Reactive Extensions
A Look at Reactive Extensions
The Observer pattern revisited
Creating Observables
Manipulating Observables
Flatmap and friends
Error handling
Backpressure
Summary
3
Asynchronous Programming and Networking
Asynchronous Programming and Networking
Building a stock market monitoring application
Rolling averages
Identifying problems with our current approach
Removing incidental complexity with RxClojure
Summary
4
Introduction to core.async
Introduction to core.async
Asynchronous programming and concurrency
core.async
Rewriting the stock market application with core.async
Error handling
Backpressure
Transducers
Summary
5
Creating Your Own CES Framework with core.async
Creating Your Own CES Framework with core.async
A minimal CES framework
Exercises
A respondent application
CES versus core.async
Summary
6
Building a Simple ClojureScript Game with Reagi
Building a Simple ClojureScript Game with Reagi
Setting up the project
Reagi and other CES frameworks
Summary
7
The UI as a Function
The UI as a Function
The problem with complex web UIs
Enter React.js
ClojureScript and Om
Building a simple Contacts application with Om
Intercomponent communication
Exercises
Summary
8
Futures
Futures
Clojure futures
Fetching data in parallel
Imminent – a composable futures library for Clojure
The movies example revisited
Futures and blocking IO
Summary
9
A Reactive API to Amazon Web Services
A Reactive API to Amazon Web Services
The problem
Infrastructure automation
AWS resources dashboard
CloudFormation
EC2
RDS
Designing the solution
Exercises
Summary
The Algebra of Library Design
The Algebra of Library Design
The semantics of map
Finding the average of ages
Applicative Functors
Gathering stats about ages
Monads
Summary
Bibliography
Bibliography
Index
Index

Exercises

With our previous approach, the only way to see new information about the AWS resources is by refreshing the whole page. Modify our implementation in such a way that it queries the stub services every so often—say, every 500 milliseconds.

Tip

The interval function from RxJS can be helpful in solving this exercise. Think how you might use it together with our existing stream by reviewing how flatMap works.

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