Book Image

Hands-On Cloud-Native Microservices with Jakarta EE

By : Luigi Fugaro, Mauro Vocale
Book Image

Hands-On Cloud-Native Microservices with Jakarta EE

By: Luigi Fugaro, Mauro Vocale

Overview of this book

Businesses today are evolving rapidly, and developers now face the challenge of building applications that are resilient, flexible, and native to the cloud. To achieve this, you'll need to be aware of the environment, tools, and resources that you're coding against. The book will begin by introducing you to cloud-native architecture and simplifying the major concepts. You'll learn to build microservices in Jakarta EE using MicroProfile with Thorntail and Narayana LRA. You'll then delve into cloud-native application x-rays, understanding the MicroProfile specification and the implementation/testing of microservices. As you progress further, you'll focus on continuous integration and continuous delivery, in addition to learning how to dockerize your services. You'll also cover concepts and techniques relating to security, monitoring, and troubleshooting problems that might occur with applications after you've written them. By the end of this book, you will be equipped with the skills you need to build highly resilient applications using cloud-native microservice architecture.
Table of Contents (14 chapters)

Circuit breaker

As the name suggests, this pattern is named like this because it comes from the electronic circuit context.

It sounds familiar, doesn't it?

The purpose of the circuit breaker pattern is the same as bulkheads, but with a different approach. Here, too, a service calling another service that is not responding or is very slow might decrease the performance of the overall system.

There is also another reason to implement the circuit breaker, which is to avoid having to keep on calling a service that you already know is broken or not reachable.

Suppose service A is calling service B, and service B is down—service A should prevent such integration and respond with a timeout error or cached data. Electronically speaking, this is the open state in the circuit, that is, no more connection between the two points.

The circuit breaker implementation should poll...