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

Reactor pattern

The reactor pattern is used to handle service requests that are received concurrently by a service handler from a single or multiple input sources. The received service requests are then demultiplexed by the service handler and dispatched to the associated request handlers. All the reactor systems are commonly found in single threads, but they are also said to exist in a multi-threaded environment.

The key benefit of using this pattern is that the application components can be divided into multiple parts such as modular or reusable. Furthermore, this allows simple coarse-grain concurrency without the additional complexity of multiple threads to the system.

Let's see the following diagram about the reactor design pattern:

As you can see in the preceding diagram, the dispatcher uses the demultiplexer to notify handler and the handler performs the actual work to be done with an I/O event. A reactor responds to I/O events by dispatching the appropriate handler. Handlers perform...