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Scala Programming Projects

You're reading from   Scala Programming Projects Build real-world projects using popular Scala frameworks such as Play, Akka, and Spark

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Product type Paperback
Published in Sep 2018
Publisher Packt
ISBN-13 9781788397643
Length 398 pages
Edition 1st Edition
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Authors (2):
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Mikael Valot Mikael Valot
Author Profile Icon Mikael Valot
Mikael Valot
Nicolas Jorand Nicolas Jorand
Author Profile Icon Nicolas Jorand
Nicolas Jorand
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Toc

Table of Contents (13) Chapters Close

Preface 1. Writing Your First Program FREE CHAPTER 2. Developing a Retirement Calculator 3. Handling Errors 4. Advanced Features 5. Type Classes 6. Online Shopping - Persistence 7. Online Shopping - REST API 8. Online Shopping - User Interface 9. Interactive Browser 10. Fetching and Persisting Bitcoin Market Data 11. Batch and Streaming Analytics 12. Other Books You May Enjoy

Implementing the transaction batch producer


In this section, we will first discuss how to call a REST API to fetch BTC/USD transactions. Then we will see how to use Spark to deserialize the JSON payload into a well-typed distributed Dataset.

After that, we will introduce the parquet format and see how Spark makes it easy to save our transactions in this format.

With all of these building blocks, we will then implement our program in a purely functional way using the Test-Driven-Development (TDD) technique.

Calling the Bitstamp REST API

Bitstamp is a cryptocurrency exchange that people use to trade a cryptocurrency, such as bitcoin, for a conventional currency, such as US dollar or euro. One of the good things about Bitstamp is that it provides a REST API, which can be used to get information about the latest trades, and can also be used to send orders if you have an account.

You can find out more here: https://www.bitstamp.net/api/.

For this project, the only endpoint we are interested in is the...

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