Drools JBoss Rules 5 0 Developers Guide 1st Edition by Michal Bali, James Taylor, Sammy Larbi ISBN 8184048408 978-8184048407

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Product details: 

ISBN 10: 8184048408

ISBN 13: 978-8184048407

Author: Michal Bali, James Taylor, Sammy Larbi 

Develop rules-based business logic using the Drools platform

• Discover the power of Drools as a platform for developing business rules
• Build a custom engine to provide real-time capability and reduce the complexity in implementing rules
• Explore Drools modules such as Drools Expert, Drools Fusion, and Drools Flow, which adds event processing capabilities to the platform
• Execute intelligent business logic with ease using JBoss/Drools, a stronger business-rules solution
• Covers examples of a fraud detection system utilizing Drools CEP (Complex Event Processing) capabilities

In Detail

Business rules can help your business by providing a level of agility and flexibility. As a developer, you will be largely responsible for implementing these business rules effectively, but implementing them systematically can often be difficult due to their complexity. Drools, or JBoss Rules, makes the process of implementing these rules quicker and handles the complexity, making your life a lot easier!

This book guides you through all of the features of Drools, such as dynamic rules, the event model, and Rete implementation with high performance indexing. It will help you to set up the JBoss Rules platform and start creating your own business. It’s easy to start developing with Drools if you follow its real-world examples that are intended to make your life easier.

Starting with an introduction to the basic syntax that is essential for writing rules, the book will guide you through validation and human-readable rules that define, maintain, and support your business agility. As a developer, you will be expected to represent policies, procedures and. constraints regarding how an enterprise conducts its business; this book makes it easier by showing you it can be done.

A real-life example of a banking domain allows you to see how the internal workings of the rules engine operate. A loan approval process example shows the use of the Drools Flow module. Parts of a banking fraud detection system are implemented with Drools Fusion module, which is the Complex Event Processing part of Drools. This in turn, will help developers to work on preventing fraudulent users from accessing systems in an illegal way.

Finally, more technical details are shown on the inner workings of Drools, the implementation of the ReteOO algorithm, indexing, node sharing, and partitioning.

What you will learn from this book?

• Write more efficient business rules, and work with the Rete algorithm, node indexing, node sharing, and parallelization
• Create a WS-HumanTask-compliant WorkItem in a process (workflow)
• Implement concurrency control in cross-cutting functionalities to manage code easily
• Write human-readable rules, and Domain Specific Language for your rules to easily understand and verify them
• Generate a stateful service by using a stateful knowledge session that maintains state between invocations and teaches you how to transactionally persist this service
• Develop dynamic remote knowledge-base loading to change rules in your application without even stopping it
• Prepare decision tables for calculating account interest rates
• Integrate Drools within your Java business application, and integrate it with the Spring framework

Approach

This is a problem-solution guide that starts with an introduction to a problem and continues with a discussion of the possible solution. The book covers best practices when working with Drools. The examples and their solutions are accompanied by plenty of code listings and figures providing a better view of the problem.

Table of contents: 

Chapter 1: Introduction

Problems with traditional approaches

The solution

Advantages

Disadvantages

When not to use a rule engine

Drools

Alternatives to Drools

Summary

Chapter 2: Basic Rules

Rule basics

Executing rules

Rule syntax

Rule concepts

Variables in rules

Types

Comments

Package

Imports

Global variables

Functions

Dialect

Rule condition

And

Or

Not

Exists

Eval

Return value restriction

Inline eval

This

Working with collections

Rule consequence

Rule attributes

Salience (priority)

No-loop

Dialect

Summary

Chapter 3: Validation

Banking domain model

Problem definition

Analysis

Design

Validation package

Object required type rules

Testing

Minimal account balance rule

Student account rule

Unique account number rule

Implementation

Validation service

Summary

Chapter 4: Data Transformation

Process overview

Getting the data

Loading facts into the knowledge session

Writing transformation rules

Testing

Address normalization

Testing the findAddress rule

Unknown country

Currency conversion

One account allowed

Transformation results

Implementation of the data loading

Database setup

Project setup

iBatis configuration

Running iBatis

Alternative data loading

Summary

Chapter 5: Human-readable Rules

Domain Specific Language

DSL as an interface

DSL for validation rules

File formats

DSL file format

DRL file format

DSLR file format

DSL for multiple constraints in a condition

Named capture groups

DSL for data transformation rules

Decision tables

Advantages of a decision table

Disadvantages of a decision table

Calculating the interest rate

Project setup

Testing

Comma Separated values

Rule Templates

Drools Flow

Drools Agenda

Methods for managing rule execution order

Ruleflow

Start

End

Action

RuleFlowGroup

Split

Join

Example

Rules

KnowledgeBase setup

Tests

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Michal Bali,James Taylor,Sammy Larbi,developer