Book Image

Java 9: Building Robust Modular Applications

By : Dr. Edward Lavieri, Peter Verhas, Jason Lee
Book Image

Java 9: Building Robust Modular Applications

By: Dr. Edward Lavieri, Peter Verhas, Jason Lee

Overview of this book

Java 9 and its new features add to the richness of the language; Java is one of the languages most used by developers to build robust software applications. Java 9 comes with a special emphasis on modularity with its integration with Jigsaw. This course is your one-stop guide to mastering the language. You'll be provided with an overview and explanation of the new features introduced in Java 9 and the importance of the new APIs and enhancements. Some new features of Java 9 are ground-breaking; if you are an experienced programmer, you will be able to make your enterprise applications leaner by learning these new features. You'll be provided with practical guidance in applying your newly acquired knowledge of Java 9 and further information on future developments of the Java platform. This course will improve your productivity, making your applications faster. Next, you'll go on to implement everything you've learned by building 10 cool projects. You will learn to build an email filter that separates spam messages from all your inboxes, a social media aggregator app that will help you efficiently track various feeds, and a microservice for a client/server note application, to name just a few. By the end of this course, you will be well acquainted with Java 9 features and able to build your own applications and projects. This Learning Path contains the best content from the following two recently published Packt products: • Mastering Java 9 • Java 9 Programming Blueprints
Table of Contents (33 chapters)
Title Page - Courses
Packt Upsell - Courses
Taking Notes with Monumentum

A small process controller application

To summarize and put into use all that we have learned in this chapter we look at a sample process control application. The functionality of the application is very simple. It reads from a series of configuration file(s) parameters how to start some processes and then if any of them stops, it tries to restart the process.

Even a real life application can be created from this demo version. You can extend the set of parameters of the process with environment variable specifications. You can add default directory for the process, input and output redirection or even how much CPU a process is allowed to consume without the controlling application killing and restarting it.

The application consists of four classes.

  • Main: This class that contains the public static void main method and is used to start up the daemon.
  • Parameters: This class contains the configuration parameters for a process. In this simple case it will only contain one field, the commandLine....