Book Image

Drools Developer's Cookbook

By : Lucas Amador
Book Image

Drools Developer's Cookbook

By: Lucas Amador

Overview of this book

<p>JBoss Drools is an open source business rules engine that provides agility and flexibility to your business logic. Drools 5 has evolved to provide a unified and integrated platform for business rules, business processes, event processing and automated planning. With this book in hand you will be able to use any of these modules and their specific features quickly and with ease.<br /><br />Drools Developer Cookbook will help you to apply the latest community features to your projects. You will learn about all the Drools modules - Guvnor, Fusion, Expert, and Planner - along with jBPM5 and integration capabilities. The straightforward recipes will help you to implement even more rules in your projects and take you to a new level with the Drools platform.<br /><br />This book teaches you how to create a more robust business rules implementation, starting with tips on how to write business rules manually, or by using the newest Guvnor rule editors. You will learn how your rules can be integrated with another framework to create a full solution and discover how to use complex features such as event processing. The recipes cover all of the Drools modules and will help you to solve problems with planning, remote execution, and much more.</p>

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Drools Developer's Cookbook
Lucas Amador
Jan, 2012 | 310 pages
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Table of Contents (16 chapters)
Drools Developer's Cookbook
Drools Developer's Cookbook
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Expert: The Rule Engine
Expert: The Rule Engine
Introduction
Declaring facts in the engine
Declaring facts using XML
Adding logging to view rules execution behavior
Using timer-based rules
Implementing calendar-based rules
Monitoring query changes in real time
2
Expert: Behind the Rules
Expert: Behind the Rules
Introduction
Marshalling knowledge sessions
Using persistence to store knowledge
How to discard duplicated facts on insertion
Using a custom classloader in a knowledge agent
Verifying the quality of rules with the Drools Verifier
Monitoring knowledge with JMX
3
Guvnor: Centralized Knowledge Management
Guvnor: Centralized Knowledge Management
Introduction
Creating our model definition with the Model Editor
Importing our model definition
Creating data enumerations
Using From Collect patterns in the Guided BRL Editor
Organizing knowledge with Working Sets
Creating rules templates
Creating knowledge snapshots
4
Guvnor: Advanced Features and Configuration
Guvnor: Advanced Features and Configuration
Introduction
Setting and creating a GUI language
Backing up your knowledge
Configuring MySQL as the default rules repository
Configuring the repository files location
Obtaining resources using the REST API
5
Fusion: Processing Complex Events
Fusion: Processing Complex Events
Introduction
How to declare our facts as events
Testing our application using a pseudo-clock
Entry-points: What they are and how we can use them
Setting up event stream processing mode
Sliding Windows
Event correlations using temporal operators
6
Executing Drools Remotely
Executing Drools Remotely
Introduction
Knowledge services and multiple endpoints configuration
Deploying the Drools Server in JBoss AS 5.x
Creating commands with XStream marshallers
Using the REST interface to execute commands
Testing the SOAP interface with soapUI
7
Integration: How to Connect Drools
Integration: How to Connect Drools
Introduction
Setting up Drools using Spring Framework
Configuring JPA to persist our knowledge with Spring Framework
Integrating Apache Camel in your project
Configuring Apache Camel with Spring Framework
Executing Drools commands from a JMS queue
8
Planner: Optimizing Your Automated Planning
Planner: Optimizing Your Automated Planning
Introduction
Solving a resource assignment problem
Using a Simulated Annealing acceptor
Terminating the Solver
Creating a basic benchmarker
9
jBPM5: Managing Business Processes
jBPM5: Managing Business Processes
Introduction
Creating a business process manually
Testing your business processes
Creating and executing human tasks
Monitoring process a activity and creating reports
Monitoring a business process with Drools Fusion
Index
Index

Using the REST interface to execute commands

In this recipe, you will see how to execute commands in the Drools Server using the RESTful interface . The interaction will be made using the Apache HTTP Client , but for more details you can continue reading through the recipe.

Getting ready

Before we interact with the Drools Server, it should be deployed into a servlet container, and of course it should be started.

How to do it...

Carry out the following steps in order to learn how to interact programmatically with the Drools Server using Java:

  1. As was said before, don't forget to add the XStream 1.4.1 library dependency into your project. If you are using Apache Maven you can add the following lines in your pom.xml dependencies configuration. Otherwise, you can download the binaries from http://xstream.codehaus.org/.

    <dependency>
  <groupId>com.thoughtworks.xstream</groupId>
    <artifactId>xstream</artifactId>
  <version>1.4.1</version>
</dependency&gt...
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