Get Implement Business Logic With The Drools Rules Engine - Ibm

The rule engine reads rules from a ruleset archive, evaluates rule conditions against application objects, and executes the rules for the objects that meet the conditions. You can maintain the rule engine independently from the business applications.

It represents the logic of the system. The rules are mainly represented in the if-then form. It contains mainly two parts, condition, and action.

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The decision engine compiles rule artifacts into an archive that contains compiled and optimized code that becomes executable when translated to Java bytecode. In comparison, a ruleset that is built with the classic rule engine contains a set of textual files that must be parsed before any compilation and optimization.

A rules engine (RE) is a module that automates the management of certain highly variable processes. The fundamental concept consists of separating the objects that are involved in processes from the logic that implements those processes.

Drools is a Business Rule Management System (BRMS) solution. It provides a rule engine which processes facts and produces output as a result of rules and facts processing. Centralization of business logic makes it possible to introduce changes fast and cheap.

Rules engines or inference engines serve as pluggable software components which execute business rules that a business rules approach has externalized or separated from application code. This externalization or separation allows business users to modify the rules without the need for IT intervention.