Book Image

Building Microservices with Spring

By : Dinesh Rajput, Rajesh R V
Book Image

Building Microservices with Spring

By: Dinesh Rajput, Rajesh R V

Overview of this book

Getting Started with Spring Microservices begins with an overview of the Spring Framework 5.0, its design patterns, and its guidelines that enable you to implement responsive microservices at scale. You will learn how to use GoF patterns in application design. You will understand the dependency injection pattern, which is the main principle behind the decoupling process of the Spring Framework and makes it easier to manage your code. Then, you will learn how to use proxy patterns in aspect-oriented programming and remoting. Moving on, you will understand the JDBC template patterns and their use in abstracting database access. After understanding the basics, you will move on to more advanced topics, such as reactive streams and concurrency. Written to the latest specifications of Spring that focuses on Reactive Programming, the Learning Path teaches you how to build modern, internet-scale Java applications in no time. Next, you will understand how Spring Boot is used to deploying serverless autonomous services by removing the need to have a heavyweight application server. You’ll also explore ways to deploy your microservices to Docker and managing them with Mesos. By the end of this Learning Path, you will have the clarity and confidence for implementing microservices using Spring Framework. This Learning Path includes content from the following Packt products: • Spring 5 Microservices by Rajesh R V • Spring 5 Design Patterns by Dinesh Rajput
Table of Contents (22 chapters)
Title Page
About Packt

Configuring the dependency injection pattern with Spring

In this section, I will explain the process required to configure dependencies in an application. The mainstream injectors are Google Guice, Spring, and Weld. In this chapter, I am using the Spring Framework, so, we will see the Spring configuration here. The following diagram is a high-level view of how Spring works:

How Spring works using dependency injection pattern

In the preceding diagram, the Configuration Instruction is the meta configuration of your application. Here, we define the dependencies in Your Application Classes (POJOs), and initialize the Spring container to resolve the dependency by combining the POJOs and Configuration Instructions, and finally, you have a fully configured and executable system or application.

As you have seen in the preceding diagram, the Spring container creates the beans in your application, and assembles them for relationships between those objects via the DI pattern. The Spring container creates...