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

API modeling


There are two standards that are competing to describe the APIs—Open APIs and RESTful APIs. We will discuss them more in the following sections.

Open API

The Open API initiative is focused on creating and promoting a vendor-neutral API description format based on the Swagger specification. The Open API specification allows us to define a standard, language-agnostic interface for REST APIs, which allows both humans and computers to discover and understand the capabilities of the service without access to source code.

In the following figures, we have described a sample API definition based on Open API along with the various sections:

Code continues in the following image:

Code continues in the following image:

RESTful API Modeling Language (RAML)

RESTful API Modeling Language (RAML) is a standard language to describe the RESTful APIs. RAML is written in the same way as YAML, which is a human-readable data serialization language. The goal of RAML is to provide all the necessary information...