Book Image

Java EE 8 High Performance

By : Romain Manni-Bucau
Book Image

Java EE 8 High Performance

By: Romain Manni-Bucau

Overview of this book

The ease with which we write applications has been increasing, but with this comes the need to address their performance. A balancing act between easily implementing complex applications and keeping their performance optimal is a present-day need. In this book, we explore how to achieve this crucial balance while developing and deploying applications with Java EE 8. The book starts by analyzing various Java EE specifications to identify those potentially affecting performance adversely. Then, we move on to monitoring techniques that enable us to identify performance bottlenecks and optimize performance metrics. Next, we look at techniques that help us achieve high performance: memory optimization, concurrency, multi-threading, scaling, and caching. We also look at fault tolerance solutions and the importance of logging. Lastly, you will learn to benchmark your application and also implement solutions for continuous performance evaluation. By the end of the book, you will have gained insights into various techniques and solutions that will help create high-performance applications in the Java EE 8 environment.
Table of Contents (12 chapters)

Reactive programming and Java EE

Reactive programming lets your code be called instead of calling your code. You can visualize it as being event-based instead of procedural. Here is an example to compare both the styles:

public void processData(Data data) {
if (validator.isValid(data)) {
service.save(data);
return data;
}
throw new InvalidDataException();
}

This is a very simple and common implementation of a business method where we call two services: validator and service. The first one will validate the data by checking whether it exists in the database, the values are in the expected ranges, and so on, while the second one will actually process the updates (a database, for instance).

The issue with this style is that the data validation and persistence are bound in a single processData method, which defines the entire execution environment (threading...