Question

how do I invoke ilrmain function in ilog jrules , is it invoked implcitly or do we have to explcitly invoke , in the latter case , how do I do it. IBM documentation is very obscure regarding ilrmain function.

Answer 1

IlrMain provides an easy way to test your rules without too much overhead.
You define your input variables, create your testcase and invoke the rule
execution with context.execute. After execution, you can display the
result.

Here’s a small example:
Imagine you’ve created a ruleset to decide whether to grant a loan or not.
Your input is called application of type LoanApplication and you
expect a decision in your output. Your IlrMain would look something
like this:

LoanApplication app = new LoanApplication();
app.loanAmount = 5000
Applicant applicant = new Applicant();
app.applicant = applicant;
applicant.dateOfBirth = new ilog.rules.xml.types.IlrDate("1980-01-01");
applicant.income = 2000;
applicant.fixedExpenses = 600;

input = app;
context.execute();

System.out.println("Loan Decision: "+output.decision);

To start the IlrMain, click on Run > Run Configurations… > Rule
Project and create a new run configuration for your rule project.
Select the project with your IlrMain-Function and make shure Launch
project with function ilrmain is selected.
Under Parameters & Arguments you should select Clear All Values so
that the parameter from your IlrMain are being used for execution.
Apply and Run

In your command line, your loan decision should appear. Something like:

Loan Decision: green