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

The DAO pattern with the Spring Framework


Spring provides a comprehensive JDBC module to design and develop JDBC-based DAOs. These DAOs in the application take care of all the boilerplate code of the JDBC API, and help to provide a consistent API for data access. In the Spring JDBC, DAO is a generic object to access data for the business tier, and it provides a consistent interface to the services at the business tier. The main goal behind the DAO's classes is to abstract the underlying data access logic from the services at the business tier.

In our previous example, we saw how the pizza company helped us to understand the resource management problem, and now, we will continue with our bank application. Let's see the following example on how to implement DAOs in an application. Suppose, in our bank application, we want the total number accounts in a branch in the city. For this, we will first create an interface for the DAO. It promotes programming to interface, as discussed earlier. It...