Book Image

Java EE 8 Design Patterns and Best Practices

By : Rhuan Rocha, Joao Carlos Purificação
Book Image

Java EE 8 Design Patterns and Best Practices

By: Rhuan Rocha, Joao Carlos Purificação

Overview of this book

Patterns are essential design tools for Java developers. Java EE Design Patterns and Best Practices helps developers attain better code quality and progress to higher levels of architectural creativity by examining the purpose of each available pattern and demonstrating its implementation with various code examples. This book will take you through a number of patterns and their Java EE-specific implementations. In the beginning, you will learn the foundation for, and importance of, design patterns in Java EE, and then will move on to implement various patterns on the presentation tier, business tier, and integration tier. Further, you will explore the patterns involved in Aspect-Oriented Programming (AOP) and take a closer look at reactive patterns. Moving on, you will be introduced to modern architectural patterns involved in composing microservices and cloud-native applications. You will get acquainted with security patterns and operational patterns involved in scaling and monitoring, along with some patterns involved in deployment. By the end of the book, you will be able to efficiently address common problems faced when developing applications and will be comfortable working on scalable and maintainable projects of any size.

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Table of Contents (20 chapters)
Title Page
Title Page
Copyright and Credits
Copyright and Credits
Dedication
Dedication
Packt Upsell
Packt Upsell
Contributors
Contributors
Preface
Preface
Free Chapter
1
Introduction to Design Patterns
Introduction to Design Patterns
Explaining design patterns
Understanding the advantages of design patterns
Understanding the basic design patterns of the Java world
Explaining enterprise patterns
Defining the difference between design patterns and enterprise patterns
Summary
2
Presentation Patterns
Presentation Patterns
Explaining the presentation tier
Explaining intercepting filter pattern
Implementing the intercepting filter pattern using Java EE 8
Explaining the FrontController pattern
The application controller pattern
Summary
3
Business Patterns
Business Patterns
Understanding the business tier
Explaining the Business Delegate pattern
Explaining the Session Façade pattern
Implementing the Session Façade pattern
Explaining the business-object pattern
Implementing the business-object pattern
Summary
4
Integration Patterns
Integration Patterns
Explaining the concept of the integration tier
Explaining the concept of the data-access object pattern
Implementing the data-access object pattern
Explaining the concept of the domain-store pattern
Implementing the domain-store pattern
Explaining the concept of the service-activator pattern
Implementing the service-activator pattern
Summary
5
Aspect-Oriented Programming and Design Patterns
Aspect-Oriented Programming and Design Patterns
Aspect-oriented programming
Summary
6
Reactive Patterns
Reactive Patterns
Explaining the concept of an event in CDI
Implementing an event in CDI
Explaining the concept of an asynchronous EJB method
Implementing an asynchronous EJB method
Implementing EJBs
Explaining the concept of an asynchronous REST service
Implementing an asynchronous REST service
Summary
7
Microservice Patterns
Microservice Patterns
Explaining microservices patterns
Explaining how microservices architecture works
Explaining when to use microservices architecture
Advantages and drawbacks of a microservices-based application
Microservices architecture patterns
Implementing microservices
Summary
8
Cloud-Native Application Patterns
Cloud-Native Application Patterns
Explaining the concept of cloud-native applications
Explaining the goals of the cloud-native application
Explaining the cloud design patterns
Summary
9
Security Patterns
Security Patterns
Explaining the concept of security patterns
Explaining the concept of the single-sign-on pattern
Implementing the single-sign-on pattern
Explaining the authentication mechanism
Implementing the authentication mechanism
Explaining the authentication interceptor
Implementing the authentication interceptor
Summary
10
Deployment Patterns
Deployment Patterns
Explaining the concept of deployment patterns
Explaining the concept of canary deployment
Explaining the concept of blue/green deployment
Explaining the concept of A/B testing
Explaining the concept of continuous deployment
Summary
11
Operational Patterns
Operational Patterns
Explaining the concept of operational patterns
Explaining the concept of performance and scalability patterns
Explaining the concept of management and monitoring patterns
Summary
12
MicroProfile
MicroProfile
Explaining the Eclipse MicroProfile project approach
Summary
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Index
Index

Chapter 6. Reactive Patterns

In this chapter, we are going to explore the concepts and implementations of reactive patterns, looking at how we can use them to implement a better application. We will also cover reactive programming concepts, focusing on how they can aid application development. After reading this chapter, we will be able to use reactive patterns using the best practices of Java EE 8.

The following topics will be explored in this chapter:

  • Explaining the concept of reactive programming
  • Explaining the concept of an event in CDI
  • Implementing an event in CDI
  • Explaining the concept of an asynchronous EJB method
  • Implementing an asynchronous EJB method
  • Explaining the concept of an asynchronous REST service
  • Implementing an asynchronous REST service

For a long time, applications processed all requests in a synchronous manner. In a synchronous process, the users request a resource and wait for its response. When this type of process begins, each step is executed right after the previous one...

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