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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

Product type Paperback

Published in Sep 2018

Publisher Packt

ISBN-13 9781788397643

Length 398 pages

Edition 1st Edition

Languages

Scala

Tools

Akka

Concepts

Programming Language

Authors (2):

Mikael Valot

Nicolas Jorand

View More author details

Table of Contents (13) Chapters

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

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Analyzing transactions with Zeppelin

In the previous chapter, we wrote a program that saves BTC/USD transactions to Parquet files. In this section, we are going to use Zeppelin and Spark to read those files and draw some charts.

If you came directly to this chapter, you first need to set up the bitcoin-analyser project, as explained in Chapter 10, Fetching and Persisting Bitcoin Market Data.

Then you can either:

Run BatchProducerAppIntelliJ. This will save the last 24 hours of transactions in the data folder of the project directory, then save new transactions every hour.
Use the sample transaction data that is committed in GitHub. You will have to check out this project: https://github.com/PacktPublishing/Scala-Programming-Projects.

Drawing our first chart

With these Parquet files ready, create a new notebook in Zeppelin and name it Batch analytics. Then, in the first cell, type the following:

val transactions = spark.read.parquet("<rootProjectPath>/Scala-Programming-Projects/bitcoin-analyser...

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Authors (2)

Valot

Valot

Mikaël Valot is Principal Software Engineer at IHS Markit in London, UK. He is the lead developer of a strategic market risk solution for banking regulation. He has over 15 years of experience in the financial industry of the UK, Switzerland, and France. He has a Diplôme d'Ingénieur in Computing (equivalent to an M.Sc.) from Telecom Nancy, France. After years of working with Java, he started developing professionally with Scala in 2010, and never looked back. He was a speaker at Scala Exchange 2015. When he is not coding in Scala, Mikaël likes to dabble with Haskell, the Robotic Operating System, and deep learning. He strongly believes that functional programming with strong typing is the best way to write safe and scalable programs.

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Nicolas Jorand

Nicolas Jorand

Nicolas Jorand is a senior developer. He worked for the finance industry for about 15 years before switching to the energy industry. He is a freelancer enjoying a partial time at Romande Energy, a Swiss utility company providing exclusively green electricity. Nicolas is a full-stack developer, playing with microcontrollers, developing standard web user and 3D interfaces on Unity, developing software to animate a humanoid robot (Nao) and finally, working with Scala on integration and backend software. All these projects are done with the same leitmotif; "In the dev process, get the issues as early as possible."

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