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

Implementing the get services


Let's take our product project developed in Chapter 2, Writing Your First Cloud-Native Application, forward. We will incrementally enhance it while discussing the concepts.

Let's think carefully about the database of our two services. getProduct returns the product information, while getProducts searches a list of products that fall into this category. To begin with, for simple and standard requirements, both queries can be answered by a single data model in a relational database:

  1. You would store a product in a product table with a fixed number of columns.
  2. You would then index the category so that the queries against it can run quickly.

Now, this design will be fine for most requirements for an average-sized company.

Simple product table

Let's use a product table in a standard relational database and access it in our service using Spring Data. Spring Data provides excellent abstractions to use the Java Persistence API (JPA) and makes coding data access objects (DAO...