Book Image

Spring 5 Design Patterns

By : Dinesh Rajput
Book Image

Spring 5 Design Patterns

By: Dinesh Rajput

Overview of this book

Design patterns help speed up the development process by offering well tested and proven solutions to common problems. These patterns coupled with the Spring framework offer tremendous improvements in the development process. The book begins with an overview of Spring Framework 5.0 and design patterns. You will understand the Dependency Injection pattern, which is the main principle behind the decoupling process that Spring performs, thus making it easier to manage your code. You will learn how GoF patterns can be used in Application Design. You will then learn 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. Then, you will be introduced to MVC patterns to build Reactive web applications. Finally, you will move on to more advanced topics such as Reactive streams and Concurrency. At the end of this book, you will be well equipped to develop efficient enterprise applications using Spring 5 with common design patterns
Table of Contents (20 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Dedication
Preface

Blocking calls


In a system, a call may be holding the resources while other calls wait for the same resources. These resources are released when the other one finishes using them.

Let's come to the technical words--actually, blocking a call means some operations in the application or system that take a longer time to complete, such as file I/O operations and database access using blocking drives. The following is a diagram of blocking calls for the JDBC operation in a system:

As you can see in the preceding diagram, the blocking operations, shown here in red, are the ones where the user calls the servlet to fetch data, then that moves to the JDBC and DB connection with the DB server. Until that time, the current thread waits for the result set from the DB server. If the DB server has latency, then this wait time can increase. That means that thread execution depends on the DB server latency.

Let's look at how to make this a non-blocking execution.