Book Image

Mastering JBoss Drools 6

By : Mariano De Maio, Mauricio Salatino, Esteban Aliverti
Book Image

Mastering JBoss Drools 6

By: Mariano De Maio, Mauricio Salatino, Esteban Aliverti

Overview of this book

Mastering JBoss Drools 6 will provide you with the knowledge to develop applications involving complex scenarios. You will learn how to use KIE modules to create and execute Business Rules, and how the PHREAK algorithm internally works to drive the Rule Engine decisions. This book will also cover the relationship between Drools and jBPM, which allows you to enrich your applications by using Business Processes. You will be briefly introduced to the concept of complex event processing (Drools CEP) where you will learn how to aggregate and correlate your data based on temporal conditions. You will also learn how to define rules using domain-specific languages, such as spreadsheets, database entries, PMML, and more. Towards the end, this book will take you through the integration of Drools with the Spring and Camel frameworks for more complex applications.
Table of Contents (18 chapters)
Mastering JBoss Drools 6
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Preface
Index

Running CEP-based Scenarios


Now that we've seen the main components of CEP rules, we need to start paying attention to some configuration steps required to run the CEP scenarios successfully in Drools. Both the Kie Base and Session that run the CEP cases need special management and we will see in the next subsections, as follows:

  • How to configure the Kie Base to support complex event processing

  • The difference between continuous and discrete rule execution

  • How the Kie Session internal clock works to evaluate temporal events

Stream processing configuration

In order to create a CEP Drools runtime, we need to provide a few extra configurations from the default initialization. The first one we need to add is the event processing mode of the Kie Base that we'll use.

The event processing mode will determine the manner in which the new data inserted into the runtime will be processed. The default event processing mode is called the CLOUD mode and basically treats any incoming data the same way, regardless...