@Deprecated(since="9.2")
public interface IRuleEngine

Deprecated.

use Rules.create()

Rule Engine is an engine to execute rules. A rule is composed of two parts, a condition and an action: When the condition is met, the action is executed.

From this interface you can create RuleBase. The RuleBase is a repository for all rule resources. Then the RuleBase has to create a new rule session to execute the rules.

Rule resource is a resource that defines rules. It can be a native rule language (*.drl) file, decision table.
Rule session is a session that interacts with the engine.

Example: execute rules on an object

  // This example will calculate tax for an employee
  Employee employee = new Employee("John Snow", 4000);
  IRuleBase rulebase = Rules.engine().createRuleBase();
  // namespace.of.rules is the folder hierarchy (namespace\of\rules) that contains rule resources
  // and inside the root rules folder in the Ivy project
  rulebase.loadRulesFromNamespace("namespace.of.rules");
  
  IStatelessRuleSession session = rulebase.createSession();
  session.execute(employee);

Example: execute rules on a collection of objects

  // This example will calculate tax for list of employees
  IRuleBase rulebase = Rules.engine().createRuleBase();
  rulebase.loadRulesFromNamespace("namespace.of.rules");
  IStatelessRuleSession session = rulebase.createSession();
  session.execute(employees);

API:: This is a public API.

Interface IRuleEngine