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Description

The times when developing on the JVM meant you were a Java programmer have long passed. The JVM is now firmly established as a polyglot development environment with many projects opting for alternative development languages to Java such as Groovy, Scala, Clojure, and JRuby. In this pantheon of development languages, Groovy stands out for its excellent DSL enabling features which allows it to be manipulated to produce mini languages that are tailored to a project’s needs. A comprehensive tutorial on designing and developing mini Groovy based Domain Specific Languages, this book will guide you through the development of several mini DSLs that will help you gain all the skills needed to develop your own Groovy based DSLs with confidence and ease. Starting with the bare basics, this book will focus on how Groovy can be used to construct domain specific mini languages, and will go through the more complex meta-programming features of Groovy, including using the Abstract Syntax Tree (AST). Practical examples are used throughout this book to de-mystify these seemingly complex language features and to show how they can be used to create simple and elegant DSLs. Packed with examples, including several fully worked DSLs, this book will serve as a springboard for developing your own DSLs.

Who is this book for?

This book is for Java software developers who have an interest in building domain scripting into their Java applications. No knowledge of Groovy is required, although it will be helpful. This book does not teach Groovy, but quickly introduces the basic ideas of Groovy. An experienced Java developer should have no problems with these and move quickly on to the more involved aspects of creating DSLs with Groovy. No experience of creating a DSL is required.

What you will learn

Familiarize yourself with Groovy scripting and work with Groovy closures

Use the metaprogramming features in Groovy to build mini languages

Employ Groovy markup and builders to simplify application development

Familiarize yourself with Groovy markup and build your own Groovy builders

Build effective DSLs with operator overloading, command chains, builders, and a host of other Groovy language features

Integrate Groovy with your Java and JVM based applications

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Frequently bought together

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Groovy for Domain-Specific Languages, Second Edition

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Gary B. Price Feb 24, 2018

This book is a gem. Though not exhaustive, it covers many Groovy DSL topics with a care and a thoughtfulness that I wish was more common. Perhaps that is because the author has experience teaching young coders. Whatever the reason, as questions occurred to me, I found them almost always subsequently answered in the text. I'm not a Groovy novice, having used it for more than a year, but several times I found succinct explanations or useful tidbits that I had wondered about but never been motivated to follow up in the day-to-day work environment. In the area of DSLs specifically, the explanations of topics like Spock and Grails in a compact, approachable form were very useful to me. The author has an obvious fondness for his topic and this helps reader motivation. It seemed to me that he was speaking from the experience of having used the things he was writing about. I read this book through my company's Safari subscription.

Amazon Verified review

George Adamopoulos May 19, 2021

I owned an electronic edition of the first edition of the book. I liked it so much even though it was dealing with Groovy 1.x that I purchased the second edition that works with 2.x

Sidharth Masaldaan Dec 07, 2015

All in all, a good introduction to DSLs in the Groovy languageThe first chapter is a decent enough introduction, it serves well to setup the rest of the book. It's a nice introduction to the concepts of DSL & explains why Groovy was chosen as the language of choice.The second chapter introduces Groovy at a basic level, one change from the previous edition that I'm happy was done, was to split the language concepts in depth into a standalone chapter. In the previous edition, the 2nd chapter was a bit of a behemoth.The third chapter introduces some basic Groovy DSL that you may or may not have heard of. This gives a nice peek into Gradle & Spock & helped me correlate how they are, in fact, DSLs.The fourth & fifth chapter introduce, in this order, Groovy's concepts (you may skip this if you aren't a total beginner with Groovy), and Closures in Groovy (you could skip this as well, unless you come from a background where closures are new, in that case, don't skip it!)It's important to note that this book isn't to learn Groovy, (I'd recommend Groovy in Action, 2nd ed from Manning), the basics that you'd need are covered, but no more, and more concepts are introduced as you need them in your DSL. I'm judging it as a gateway to DSLs in Groovy & not as a gateway to Groovy the language. Your mileage may vary, of course.Chapter 6 is where we dive into our first Groovy DSL, a Twitter client. I'm a little conflicted by the example, which is well done, but I'd personally have chosen something like a Banking example, where you could showcase different domain rules & you'd have a lot of scenarios with tons of boilerplate code in Java, which could be broken down into a Groovy DSL.Chapters 7 introduce us to some patterns & advanced techniques (or Power Features, as suggested by the chapters title) that we can leverage in our DSLs. This is where I started to sort of disagree with the book. I would have preferred that a single Domain be used as the basis for our example application/DSL, wherein we build it up & make it more feature-rich, by adding the concepts into that single DSL as these concepts are introduced to us.Don't get me wrong, the examples are clear & do a great job of explaining the concept, e.g. Chapter 10, Building a Builder, has a great example of using these patterns to build a database seed builder (something I've tried to do in Java, only to have it devolve into an unholy mess)Chapter 8 again does a good job of explaining (what is a tough topic to digest for me) Abstract Syntax Trees (ASTs), I thought it was a neat, well-thought out chapter, with a nice enough example implementation of a state machine at the end.Chapter 9 shows how Groovy DSLs Spock & Grails implement features & techniques we saw earlier, this is where the book starts to win my attention back. It was nice to see how the techniques we read about earlier are used in real-world, full-fledged DSLsChapter 11 & 12 are where it really shines again, first with an example in 11 for a rules based DSL (which should have been our example application from the beginning, in my view) & then with a full-fledged game app, complete with a backing MongoDB & a web based front-end. Again, the examples are well done, the explanation is really great.Conclusion: If you have the first edition, you could give the 2nd ed a skip. A good book, but the constant switching of contexts lost me from time-to-time. If you're looking to understand how DSLs are implemented (& want to move beyond Java) this is a nice starting point.

Groovy for Domain-Specific Languages, Second Edition: Extend and enhance your Java applications with domain-specific scripting in Groovy

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