Book Image

Cloud-Native Applications in Java

By : Andreas Olsson, Ajay Mahajan, Munish Kumar Gupta, Shyam Sundar S
Book Image

Cloud-Native Applications in Java

By: Andreas Olsson, Ajay Mahajan, Munish Kumar Gupta, Shyam Sundar S

Overview of this book

Businesses today are evolving so rapidly that they are resorting to the elasticity of the cloud to provide a platform to build and deploy their highly scalable applications. This means developers now are faced with the challenge of building build applications that are native to the cloud. For this, they need to be aware of the environment, tools, and resources they’re coding against. If you’re a Java developer who wants to build secure, resilient, robust, and scalable applications that are targeted for cloud-based deployment, this is the book for you. It will be your one stop guide to building cloud-native applications in Java Spring that are hosted in On-prem or cloud providers - AWS and Azure The book begins by explaining the driving factors for cloud adoption and shows you how cloud deployment is different from regular application deployment on a standard data centre. You will learn about design patterns specific to applications running in the cloud and find out how you can build a microservice in Java Spring using REST APIs You will then take a deep dive into the lifecycle of building, testing, and deploying applications with maximum automation to reduce the deployment cycle time. Gradually, you will move on to configuring the AWS and Azure platforms and working with their APIs to deploy your application. Finally, you’ll take a look at API design concerns and their best practices. You’ll also learn how to migrate an existing monolithic application into distributed cloud native applications. By the end, you will understand how to build and monitor a scalable, resilient, and robust cloud native application that is always available and fault tolerant.
Table of Contents (20 chapters)
Title Page
Dedication
Packt Upsell
Foreword
Contributors
Preface
Index

Writing test cases before development


In this book, we started developing a simple service in Chapter 2Writing Your First Cloud-Native Application, in Spring Boot to get you excited about cloud development. However, real development follows a different style of best practice.

TDD

A project starts with understanding the requirements and writing test cases that validate the requirements. Since the code does not exist at this point, the test case will fail. Then, the code is written that passes the test case. This process iterates till the test cases and the required code are complete to realize the business functionality. Kent Beck has an excellent book on this subject, Test Driven Development by Example. In the next section, we will redo the product service from Chapter 4Extending Your Cloud-Native Application, using the principles in this chapter. But before that, let's look at another important concept, BDD.

BDD

Taking a leaf out of Agile development principles and user stories, BDD encourages...