attributes.adoc

Attribute

Table of Contents

• 语法
• 示例
  • no-loop
  • salience
  • agenda-group
  • auto-focus

语法

属性	默认值	类型	描述
no-loop	false	Boolean	用来设定是否循环执行规则
ruleflow-group	null	String	用来关联规则流与规则而实现规则的顺序执行。在某种层面上是对规则的分区执行。
salience	0	Integer	定义规则执行的优先级
agenda-group	MAIN	String	分区执行规则, 不能与 ruleflow-group 同时存在。
auto-focus	false	Boolean	控制在执行 MAIN agenda-group 之前执行其它 agenda-group 中的规则
lock-on-active	false	Boolean	控制 agenda-group 与 ruleflow-group 中规则是否同时存在
date-effective	null	String	规则在一段事件之后才可以被执行
date-expires	null	String	规则在一段事件之内可以被执行

示例

no-loop

规则 - testLoop.drl

package org.drools.examples.loop;

import org.drools.examples.model.Cursor;

rule "no-loop testing"
  no-loop true // will skip loop
  when
    c : Cursor(cur < 10, tmpCur : cur)
  then
    System.out.println(tmpCur);
    c.setCur(c.getCur() + 1);
    update(c);
end

执行代码 - Example_Loop.java

KieServices ks = KieServices.Factory.get();
KieContainer kContainer = ks.getKieClasspathContainer();
KieSession kSession = kContainer.newKieSession("ksession-rules-no-loop");

Cursor cur = new Cursor(5);
kSession.insert(cur);
kSession.fireAllRules();
kSession.dispose();

salience

规则 - testSalience.drl

package org.drools.examples.saliences;

rule "Rule 01"
  salience -100
  when
    eval (true)
  then
    System.out.println("Rule 01");
end

rule "Rule 02"
  when
    eval (true)
  then
    System.out.println("Rule 02");
end

rule "Rule 03"
  salience 100
  when
    eval (true)
  then
    System.out.println("Rule 03");
end

执行代码 - Example_Salience.java

KieServices ks = KieServices.Factory.get();
KieContainer kContainer = ks.getKieClasspathContainer();
KieSession kSession = kContainer.newKieSession("ksession-rules-saliences");
kSession.fireAllRules();
kSession.dispose();

agenda-group

规则 - testPartition.drl

package org.drools.examples.partition;

rule "Rule 01"
  agenda-group "partitionA"
  when
    eval (true)
  then
    System.out.println("Rule 01");
end

rule "Rule 02"
  agenda-group "partitionB"
  when
    eval (true)
  then
    System.out.println("Rule 02");
end

执行代码 - Example_Partition.java

KieServices ks = KieServices.Factory.get();
KieContainer kContainer = ks.getKieClasspathContainer();
KieSession kSession = kContainer.newKieSession("ksession-rules-partition");
kSession.getAgenda().getAgendaGroup("partitionB").setFocus();
kSession.fireAllRules();
kSession.getAgenda().getAgendaGroup("partitionA").setFocus();
kSession.fireAllRules();
kSession.dispose();

auto-focus

规则 - auto_focus.drl

package attributes

rule "auto-focus set to 'true'"
agenda-group "TEST"
auto-focus true
    when
        eval(true)
    then
        System.out.println(drools.getRule().getName());
end

执行代码 - Aattributes_auto_focus.java

KieServices ks = KieServices.Factory.get();
KieContainer kContainer = ks.getKieClasspathContainer();
KieSession kSession = kContainer.newKieSession("ksession-attributes");
kSession.fireAllRules();
kSession.dispose();