Book Image

Cloud Native Applications with Ballerina

By : Dhanushka Madushan
Book Image

Cloud Native Applications with Ballerina

By: Dhanushka Madushan

Overview of this book

The Ballerina programming language was created by WSO2 for the modern needs of developers where cloud native development techniques have become ubiquitous. Ballerina simplifies how programmers develop and deploy cloud native distributed apps and microservices. Cloud Native Applications with Ballerina will guide you through Ballerina essentials, including variables, types, functions, flow control, security, and more. You'll explore networking as an in-built feature in Ballerina, which makes it a first-class language for distributed computing. With this app development book, you'll learn about different networking protocols as well as different architectural patterns that you can use to implement services on the cloud. As you advance, you'll explore multiple design patterns used in microservice architecture and use serverless in Amazon Web Services (AWS) and Microsoft Azure platforms. You will also get to grips with Docker, Kubernetes, and serverless platforms to simplify maintenance and the deployment process. Later, you'll focus on the Ballerina testing framework along with deployment tools and monitoring tools to build fully automated observable cloud applications. By the end of this book, you will have learned how to apply the Ballerina language for building scalable, resilient, secured, and easy-to-maintain cloud native Ballerina projects and applications.
Table of Contents (15 chapters)
1
Section 1: The Basics
4
Section 2: Building Microservices with Ballerina
8
Section 3: Moving on with Cloud Native

Building a Ballerina HTTP service

Cloud native applications depend heavily on network communications and HTTP is a widely used protocol for communicating between servers and clients. HTTP is the most common protocol used to implement web servers through various types of communication protocols. The HTTP protocol is simple by design, and it is the main protocol used in a web browser.

Network communication is a first-class concept in the Ballerina language. Ballerina has built-in HTTP libraries to support building HTTP services. Here, we discuss different ways of building an HTTP server that responds to the client with a payload.

Ballerina uses the concept called service, which is a collection of resources. Each resource has its own implementation that can be uniquely identified by a Universal Resource Locator (URL) address. A service exposes that collection of resources on a specified port. This will enable another service or client application to access these services and get...