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

Ballerina logging

Logging is the simplest way to collect data from a running Ballerina instance. Ballerina's built-in log module provides different functionalities to work with logs. In this section, we will discuss the features provided by Ballerina and the tools that can be used to collect and analyze logs.

Printing logs with Ballerina

Ballerina's log module provides you with a simple way of printing logs to the standard output of the terminal. Ballerina offers four log levels to log messages:

  • DEBUG log: These logs are for debugging the flow of the code. This log level is widely used when issues occur and you need to debug the program flow.
  • INFO log: This is used to log information-level logs. These logs are used to log normal behavior of the program's execution flow.
  • WARN log: These are possible failures that might cause the program to go in an erroneous flow. Warning logs can be used to give a warning about the system before there is a failure...