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
Copyright
About Packt
Contributors
Preface
Index

What is Aspect-Oriented Programming?


As mentioned earlier, Aspect-Oriented Programming (AOP) enables modularization of cross-cutting concerns. It complements Object-oriented programming (OOP) which is another programing paradigm. OOP has class and object as key elements but AOP has aspect as key element. Aspects allow you to modularize some functionality across the application at multiple points. This type of functionality is known as cross-cutting concerns. For example, security is one of the cross-cutting concerns in the application, because we have to apply it at multiple methods where we want security. Similarly, transaction and logging are also cross-cutting concerns for the application and many more. Let's see in the following figure how these concerns are applied to the business modules:

As you can see in the preceding figure, there are three main business modules as TransferService, AccountService, and BankService. All business modules require some common functionality such as Security...