Book Image

Hands-On Cloud-Native Applications with Java and Quarkus

By : Francesco Marchioni
Book Image

Hands-On Cloud-Native Applications with Java and Quarkus

By: Francesco Marchioni

Overview of this book

Quarkus is a new Kubernetes-native framework that allows Java developers to combine the power of containers, microservices, and cloud-native to build reliable applications. The book is a development guide that will teach you how to build Java-native applications using Quarkus and GraalVM. We start by learning about the basic concepts of a cloud-native application and its advantages over standard enterprise applications. Then we will quickly move on to application development, by installing the tooling required to build our first application on Quarkus. Next, we’ll learn how to create a container-native image of our application and execute it in a Platform-as-a-Service environment such as Minishift. Later, we will build a complete real-world application that will use REST and the Contexts and Dependency injection stack with a web frontend. We will also learn how to add database persistence to our application using PostgreSQL. We will learn how to work with various APIs available to?Quarkus?such as Camel, Eclipse MicroProfile, and Spring DI. Towards the end, we will learn advanced development techniques such as securing applications, application configuration, and working with non-blocking programming models using Vert.x. By the end of this book, you will be proficient with all the components of Quarkus and develop-blazing fast applications leveraging modern technology infrastructure.
Table of Contents (15 chapters)
Free Chapter
Section 1: Getting Started with Quarkus
Section 2: Building Applications with Quarkus
Section 3: Advanced Development Tactics

Getting started with Reactive Messaging

Reactive Streams is an initiative that aims to provide a standard for exchanging data streams across an asynchronous boundary. At the same time, it guarantees that the receiving side is not forced to buffer arbitrary amounts of data.

There are several available implementations of Reactive Stream, and we have already learned how you can feature Reactive Programming in Vert.x. In this chapter, we will complement our knowledge using the SmallRye Reactive Messaging implementation to show you how we can integrate it with a streaming platform such as Apache Kafka or a messaging broker such as ActiveMQ with minimal configuration changes.

To familiarize ourselves with MicroProfile Reactive Messaging, we need proper knowledge of some key concepts. First of all, MicroProfile Reactive Messaging is a specification that uses CDI beans to drive the flow...