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

Using event sourcing and CQRS in a distributed system

The order management system that we described earlier is built with a series of commands and events. Events are a series of states that come in and are generated by the system. Events are immutable. This means that when an event is generated, the event will not be changed and will remain as it is. The immutable nature of events can be used to implement a consistent database. A series of events can also be used to analyze the system in the case of failure. Event sourcing can be used with the CQRS pattern, which allows systems to perform much faster. In this section, we will learn about building applications with event sourcing and the CQRS design pattern.

Using events to communicate among services

Events are immutable where the event does not get changed later. Events don't follow the CRUD principles. Instead, the event source system stores all the events in the event store. In simple words, event sourcing means keeping...