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Instant Drools Starter, by Jeremy Ary
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In Detail
Drools is a popular business rule management system. The book introduces the concept of rules separation, from what to do to how to do it. This Starter guide supports your development to keep pace with your system’s ever-changing needs, making things simple and easy by taking the rigidity out of complex codes.
"Instant Drools Starter" is a practical, hand-on guide that provides you with a number of clear and concise explanations with relatable examples. This book offers step-by-step exercises to help you understand business rule management systems. Learn how they work, how they're best used, and how to perform frequently used tasks and techniques.
This Starter guide helps you get familiar with the Drools concept. You will learn to evaluate rules engines and cover all the basics, from rules authoring to troubleshooting. This book highlights the capabilities of the Drools modules.
After discovering exactly what rules are and what a rule engine brings to the table, we will quickly learn how to install Drools. The guide then explores different tools of the trade and gets you writing your first set of rules instantly. We'll then take those rules, write vital codes piece by piece, and put them into action. In addition, with this guide, learn how to document and troubleshoot everything behind the scenes, as well as developing your rules to the next level. "Instant Drools Starter" will cover everything you need to know to get started, so if you are looking for a complete guide that provides simple solutions to complex problems, look no further.
Approach
Get to grips with a new technology, understand what it is and what it can do for you, and then get to work with the most important features and tasks.A simple Starter, introducing the Drools concept. The book takes a meticulous approach to providing quick and simple solutions in a practical manner for rules engines and their uses.
Who this book is for
This book is great for developers, architects, and managers who need to evaluate or get up to speed with Drools engine usage and functionality. This book teaches you to capture and document business processes and represent their maintenance development to business users.
- Sales Rank: #850102 in eBooks
- Published on: 2013-03-26
- Released on: 2013-03-26
- Format: Kindle eBook
About the Author
Jeremy Ary
Jeremy Ary is a senior software developer, born and raised in Tennessee, USA. He began working with Drools systems over 5 years ago, and is an active member of the community and conferences, which has only served to increase his curiosity and desire to work with rules engines. He has spent his time in the field improving various rule-based legacy systems in finance, and creating others from scratch to automate company workflow processes. Jeremy also authored scalable rule-based emergency response and notification systems for both domestic and international customers.
When not in code monkey mode, Jeremy can be found in his shop doing woodworking, out on the waters fishing, or at home spending time with his two dachshunds, his loving wife Becca, and his newborn son Everett.
You can keep up with Jeremy's latest works at his Github account, www.github.com/jeremyary, or you can reach out to him via LinkedIn at www.linkedin.com/in/jeremyary/ or e-mail him at jeremy.ary@gmail.com.
Most helpful customer reviews
1 of 1 people found the following review helpful.
Decent albeit very brief introduction to Drools Expert
By Erik Gfesser
Since it had been several years since I last used a rules engine to any significant extent on a work project, and introductory Drools community documentation seemed to be lacking, I had thought it might make sense to pick up a text on Drools, but it was quickly apparent that very few books have been written on the product and of the ones available in the marketplace the one that is the object of this review is only one of two that has been recently written. Since this book was marketed as a starter text, I also purchased the second of these two, "Drools Developer's Cookbook", from the same publisher which seems to have the corner on the market right now with respect to Drools.
My initial proof of concept utilized the first half of this book, which is a very brief 30-pages. The java code and DRL (Drools Rule Language) file and accompanying JUnit tests work just fine, and the introductory explanation of the rules dialect called MVEL (MVFLEX Expression Language) was adequate to get going as well. The simple Maven pom.xml worked as well, but the instructions to install the Drools Eclipse plugin were not complete, and installation of the plugin itself was not worth the effort in my opinion so the focus that the book places on it is a bit distracting (especially because the initial release of Eclipse Juno that I had was problematic for this plugin, so I was compelled to install the second release alongside the first). Especially because I immediately needed to research how to make use of DRT (Drools Rule Template) files so that I would not need to be dependent on static files, and the plugin does not support this feature of Drools.
The second half of this book is comprises a "Top 5 features you need to know about" section that includes discussion on "reading and writing Drools Rule Language syntax", "working with facts", "testing your rules", "debugging the rule evaluation process", and "the five core modules that make up Drools". For readers new to Drools, be aware that this last discussion provides a brief 2-page description of the five core modules of Drools (jBPM, Drools Expert, Drools Fusion, Drools Guvnor, and Drools Planner, which has been renamed Drools OptaPlanner since this book has been published), but this text only covers Drools Expert. For most readers, Drools Expert is the module in which they will be interested, but I was also initially interested in Drools Guvnor until I realized that handing over the capability of managing rules to business users who have sparse technical skills will probably not play out so well.
As a new or virtually new Drools Expert user, also be aware that it is has undergone a number of changes with regard to the API over time, and continues to be reworked by the development team. While this text does not explicitly state which version of Drools is presented, "Drools Developer's Cookbook" published last year covers Drools 5.2.0.Final. While I plan to adopt Drools 5.5.0.Final for my work project, since it is the most recent stable version of the product, a few beta versions of Drools 6.0.0 have been released that reportedly exhibit some degree of refactoring and which may or may not enable continued use of this particular text, although as with most open source communities, the development team will likely seek mimimal disruption.
0 of 0 people found the following review helpful.
Great Way to Start with Drools
By Valon Cross
This is a focused and practical book that does what it claims to: It guides you through setting up Drools and, with the downloadable example code, exposes the new user to various ways of testing and using rules. Another positive: The author responded to my initial questions and tried to help me get setup.
I give this 4 out of 5 stars because the author did not provide a full Eclipse project to download and the debugging did not work "as is" with my version of Eclipse. Eclipse debugging started working for me when I added dialect "mvel" after the rule declaration (I found various forum postings and eventually one gave me the right tip). But thanks to this book, I knew debugging rules was possible and that it was supposed to work.
As reviewer Sang said: You would start with this book and then use the documentation on JBoss's website for reference and to get deep into the various ways you can write rules - like using collections. But this gets you started.
It goes over all the important concepts of drools such a as "working memory", "agenda" and authoring rules with the drools rule language (drl's). However, being quite short, it does not cover decision tables or writing rules using domain specific languages. I really like the examples for writing Junit test classes - your rules system must be testable after making changes. The test suite will catch any unexpected logic results after making changes to new or old rules. The book also introduces some advanced concepts like salience to get you thinking about rule priorities.
I highly recommend this book to Drools newbies.
2 of 2 people found the following review helpful.
Leaflet vs. book
By Kari Paukku
While the book(?) - more a leaflet - may be viewed by others as a good starting point, I feel that a $12 for 12 pages with the idea "Learn something new in an Instant!" as the author describes it, is not simply worth it.
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