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

Synchronous communication

Communication methods can be separated into two main categories, as synchronous and asynchronous communication. In synchronous communication, the client sends a request and waits for a reply. Examples of this type of communication method are HTTP, WebSocket, and GRPC protocols. Asynchronous communication, on the other hand, does not wait for a response. In this section, we will discuss different types of synchronous communication methods supported by the Ballerina language with sample code.

Handling HTML form data

Hypertext Transfer Protocol (HTTP) is the most common and simple synchronous method that is widely used to communicate with other services. We have already discussed how to create a simple HTTP server and how to invoke it in the previous chapter. In this section, we will discuss more practical aspects of HTTP.

When you are building web applications, HTML forms are a common way of collecting information from the end user. This information...