easyrules 4.1.0




import org.jeasy.rules.annotation.Action;
import org.jeasy.rules.annotation.Condition;
import org.jeasy.rules.annotation.Fact;
import org.jeasy.rules.annotation.Rule;
import org.jeasy.rules.api.Facts;


@Rule(name = "age rule", description = "Check if user is of legal age to buy alcohol")
public class AgeRule {

    @Condition
    public boolean checkAge(@Fact("age") int age) {
        System.out.println("age="+age);
        return age >= 18;
    }

    @Action
    public void action(Facts facts) {
        System.out.println("age is >= 18");
        facts.put("result","age is >= 18");
    }

    @Priority
    public int getPriority() { return 1;}

}



import org.jeasy.rules.api.Facts;
import org.jeasy.rules.api.Rules;
import org.jeasy.rules.core.DefaultRulesEngine;

public class AgeRuleDemo {

    public static void main(String[] args) {
        AgeRule ageRule = new AgeRule();
        Rules rules = new Rules();
        rules.register(ageRule);
        DefaultRulesEngine rulesEngine = new DefaultRulesEngine();
        Facts facts = new Facts();
        facts.put("age", 20);
        facts.put("name", "tiger");

        // [main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule 'age rule' triggered
        rulesEngine.fire(rules, facts);
        System.out.println(facts);

        facts = new Facts();
        facts.put("age", 10);
        // [main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule 'age rule' has been evaluated to false, it has not been executed
        rulesEngine.fire(rules, facts);

        System.out.println(facts);

    }

}


注解

@Rule(name = "age rule", description = "Check if user is of legal age to buy alcohol")
@Priority

@Fact("age") int age

@Action(order = 0)
@Action(order = 1)

多个 action