Book Image

Spring Microservices

By : Rajesh R V
Book Image

Spring Microservices

By: Rajesh R V

Overview of this book

The Spring Framework is an application framework and inversion of the control container for the Java platform. The framework's core features can be used by any Java application, but there are extensions to build web applications on top of the Java EE platform. This book will help you implement the microservice architecture in Spring Framework, Spring Boot, and Spring Cloud. Written to the latest specifications of Spring, you'll be able to build modern, Internet-scale Java applications in no time. We would start off with the guidelines to implement responsive microservices at scale. We will then deep dive into Spring Boot, Spring Cloud, Docker, Mesos, and Marathon. Next you will understand how Spring Boot is used to deploy autonomous services, server-less by removing the need to have a heavy-weight application server. Later you will learn how to go further by deploying your microservices to Docker and manage it with Mesos. By the end of the book, you'll will gain more clarity on how to implement microservices using Spring Framework and use them in Internet-scale deployments through real-world examples.
Table of Contents (18 chapters)
Spring Microservices
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Preface
Index

Autoscaling BrownField PSS microservices


In this section, we will examine how to enhance microservices developed in Chapter 5, Scaling Microservices with Spring Cloud, for autoscaling. We need a component to monitor certain performance metrics and trigger autoscaling. We will call this component the life cycle manager.

The service life cycle manager, or the application life cycle manager, is responsible for detecting scaling requirements and adjusting the number of instances accordingly. It is responsible for starting and shutting down instances dynamically.

In this section, we will take a look at a primitive autoscaling system to understand the basic concepts, which will be enhanced in later chapters.

The capabilities required for an autoscaling system

A typical autoscaling system has capabilities as shown in the following diagram:

The components involved in the autoscaling ecosystem in the context of microservices are explained as follows:

  • Microservices: These are sets of the up-and-running...