What is Drools in Business Rule Engine Module?

General
1

How we can use Drools?

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Drools is a Business Rule Management System (BRMS) and Rule Engine written in Java. It allows us to define and manage rules externally from the core application, making it easier to maintain and update logic.

  • Rules in Drools are expressed as " when-then" statements.
  • When: Conditions that trigger the rule.
  • Then: Actions performed when the condition is met.

Example Rule:

rule "Discount for age < 20 or > 50"
when
    $input: Map(get("age") < 20 || get("age") > 50)
then
    $input.put("discount", 10);  // Apply 10% discount
end;

Operators in Drools:

  • ==, &&, ||, >, <, >=, <=
  • Supports date operations like parseDate().

Drools decouples logic from code, enabling easier decision-making and maintenance in dynamic environments.

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