Tag Archives: Scala

Microservices Development with Scala, Spray, MongoDB, Docker and Ansible

This article tries to provide one possible approach to building microservices. We’ll use Scala as programming language. API will be RESTful JSON provided by Spray and Akka. MongoDB will be used as database. Once everything is done we’ll pack it all into a Docker container. Vagrant with Ansible will take care of our environment and configuration management needs.

We’ll do the books service. It should be able to do following:

  • List all books
  • Retrieve all the information related to a book
  • Update an existing book
  • Delete an existing book
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Scala Test-Driven Development (TDD): Unit Testing File Operations with Specs2 and Mockito

In this article we’ll go through the exercise of writing a method that will write string content to the specified file. There will be an option to specify whether we should overwrite an existing file. In addition, directories should be created if they do not already exist.

Programming language is Scala and testing framework that will be used is Specs2. In the spirit of unit testing, instead of interactions with the file system we’ll use mocks with Mockito (already included in Specs2). All the code will be done using Test-Driven Development (TDD).

This article is based on an existing code done for the open source application BDD Assistant located in the TechnologyConversationsBdd repository.

Let’s get started.
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BDD Assistant: It’s alive and cries for help

tutorialStoryOperationsI’ve been working with BDD for years and felt that it needed an application that would facilitate the Behaviour-driven development work-flow. It would need to be made in a away that anyone can use it. By anyone I mean people with or without technical skills. Coders, testers, analysts, managers, business, etc. In that spirit, I started working on BDD Assistant. It is an open source application that can be used to create, manage and run BDD stories.

Now I feel that it is finally ready to go public. The application is far from being finished but there is enough done for the community to see what it’s all about. More information can be found in the BDD Assistant site. Latest release can be downloaded from our GitHub repo. Live demo (with some features disabled due to hosting limitations) can be seen from the BDD Assistant demo.
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Scala Tutorial Through Katas: Reverse Polish Notation (Medium)

A programming kata is an exercise which helps a programmer hone his skills through practice and repetition.

This article is part of the series “Scala Tutorial Through Katas”. Articles are divided into easy, medium and hard. Beginners should start with easy ones and move towards more complicated once they feel more comfortable programming in Scala.

For the complete list of Scala katas and solutions please visit the index page
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Scala Tutorial Through Katas: Bowling Game (Medium)

A programming kata is an exercise which helps a programmer hone his skills through practice and repetition.

This article is part of the series “Scala Tutorial Through Katas”. Articles are divided into easy, medium and hard. Beginners should start with easy ones and move towards more complicated once they feel more comfortable programming in Scala.

For the complete list of Scala katas and solutions please visit the index page
Continue reading

Scala Tutorial Through Katas: Word Wrap (Easy)

A programming kata is an exercise which helps a programmer hone his skills through practice and repetition.

This article is part of the series “Scala Tutorial Through Katas”. Articles are divided into easy, medium and hard. Beginners should start with easy ones and move towards more complicated once they feel more comfortable programming in Scala.

For the complete list of Scala katas and solutions please visit the index page
Continue reading

Scala Tutorial Through Katas: Mars Rover (Medium)

A programming kata is an exercise which helps a programmer hone his skills through practice and repetition.

This article is part of the series “Scala Tutorial Through Katas”. Articles are divided into easy, medium and hard. Beginners should start with easy ones and move towards more complicated once they feel more comfortable programming in Scala.

For the complete list of Scala katas and solutions please visit the index page
Continue reading