easy-rules/site/user-guide/rules-engine.md

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Easy Rules engine handles a registry of rules with unique names. Each instance of Easy Rules engine can be seen as a separate namespace.

Rules are applied according to their natural order.

Easy Rules engine provides the following parameters:

Parameter	Type	Required	Default
skipOnFirstAppliedRule	boolean	no	false
rulePriorityThreshold	int	no	Integer.MAX_VALUE

The skipOnFirstAppliedRule parameter tells the engine to skip next applicable rules when a rule is applied.

The rulePriorityThreshold parameters tells the engine to skip next rules if priority exceeds the defined threshold.

You can specify these parameters at rules engine construction time.

Create a default rules engine

To create a default Easy Rules engine and register a rule, use the following snippet:

RulesEngine<Rule> rulesEngine = new DefaultRulesEngine();
rulesEngine.registerRule(myRule);

You can fire registered rules as follows:

rulesEngine.fireRules();

Create a annotated rules engine

If your rules are annotated POJOs, you have to use the AnnotatedRulesEngine to register them:

AnnotatedRulesEngine rulesEngine = new AnnotatedRulesEngine();
rulesEngine.registerRule(myRule);

As with default engine, you can fire rules using the following snippet :

rulesEngine.fireRules();