Examples

Learn by examples.

 

WhatsNew:

OpenRules 6.3.1 is available

The Release 6.3.1 enhances OpenRules BDMS with new features such as: automatic testing facilities that compare expected and actual decision execution results; handling Excel workbooks in the XLSX formats; additional macros for the expression language, and other features requested by customers. 
May 18, 2014

DMN 1.0 Live Primer

OpenRules® provides an implementation of the DMN 1.0 Primer based on the oncoming OMG standard "Decision Model and Notation".   

OpenRules on Cloud

Read the tutorial "Cloud Application Development" with examples of OpenRules web applications available on the cloud.

WhatTheySay:

Forrester Research, Inc.

"OpenRules have the most-aggressive approaches to business-expert authoring and typically requires less developer support than IBM ILOG, FICO Blaze Advisor, and JBoss BRMS.

Market Overview: Business Rules Platforms

 

Here are several examples that can help you quickly understand how OpenRules® represents decisions and supporting decision tables. Follow the links below to see different spreadsheets with business rules:

What you will see are actually working decision models created in Excel without programming. Using the familiar Excel interface, a business analyst can enter decisions along with supporting decision tables and test cases, and then execute the decision to verify that it produces the expected results.

A detailed description of these and other decision projects are provided in the document "Getting Started". You may also watch brief videos with simple explanations.

Decision "Hello Customer"

Below we will explain the first decision presented in the file DecisionHello.xls. It decides how to greet a customer during different times of the day. For example, if a customer, Robinson, is a married woman and the local time is 20:25, we want our decision to produce the following greeting: "Good Evening, Mrs. Robinson!"

In order to make this decision we need to make two sub-decisions:

- Define Greeting Word (e.g. “Good Afternoon”)

- Define Salutation Word (e.g. “Mrs.”)

OpenRules® provides special tables for representing decisions where each sub-decision is implemented as a Decision Table.  So, first we will create an Excel table “DetermineCustomerGreeting” of the type "Decision":

 

Decision DetermineCustomerGreeting
Decisions Execute Rules
Define Greeting Word := DefineGreeting()
Define Salutation Word := DefineSalutation()
Print Greeting := System.out.println(response.greeting + ", " +  response.salutation + customers[0].name + "!")

The first column of this table defines the decision name and the second column defines the decision table that implements the related (sub) decision. The first decision table determines a greeting word based on the current hour: 

DecisionTable DefineGreeting

If

Then

Current Hour

Greeting

0-11

Good Morning

11-17

Good Afternoon

17-22

Good Evening

22-24

Good Night

The second decision table determines a salutation word based on the customer gender and marital status: 

 

DecisionTable DefineSalutation

Condition

Condition

Conclusion

Gender

Marital Status

Salutation

Is

Male

 

 

Is

Mr.

Is

Female

Is

Married

Is

Mrs.

Is

Female

Is

Single

Is

Ms.

 

These decision tables deal with decision variables that are described in the following glossary:

 

Glossary glossary

Decision Variable

Business Concept

Attribute

Gender

Customer

gender

Marital Status

maritalStatus

Greeting

Response

greeting

Salutation

salutation

Current Hour

hour

 

We associate all facts with the proper business concepts like Customer and Response and their attributes. The proper concepts can be defined as Java objects, Excel tables, or XML files. Here is the their representation in Excel tables:  

Datatype Customer

String

name

String

maritalStatus

String

gender

int

age

 

Datatype Response

String

greeting

String

salutation

int

hour

We may also create test cases for these data types directly in Excel: 

 Data Customer customers

name

maritalStatus

gender

age

Customer Name

Marital Status

Gender

Age

Robinson

Married

Female

24

Smith

Single

Male

19

 

Variable Response response

greeting

salutation

hour

Greeting

Salutation

Current Hour

?

?

20

We may execute this decision from a standard Java program (that is provided and contains just two lines) and it will produce the following results:

Define Current Time

Conclusion: Current Hour is 20

Define Greeting Word

Conclusion: Greeting is Good Evening

Define Salutation Word

Conclusion: Salutation is Mrs.

Print Greeting

Good Evening, Mrs. Robinson!

The same decision can work with Java objects or it can be deployed as a web service. 

You may evaluate many other examples doing OpenRules®  evaluation. The evaluation version includes many decision models and does not require any installation. You may take a look at the decision project Excel and Java files, and analyze the results of their execution. Many of these projects are described in detail in the Getting Started document and other Tutorials.

Click here to look at many more decision models in Excel along with their execution results.

The complete OpenRules installation also includes:

To learn more, please download these and other examples from here, change the rules, and run them from the provided batch-files or from your own Java code.  See how complex projects with extensive rules and web components can be organized and maintained under Eclipse with OpenRules® plug-ins.

Contact us at OpenRules, Inc. with any questions, suggestions or if you need support or consulting services.

 

 

 

 

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