fibonacci.groovy.drl

来自「drools 一个开放源码的规则引擎」· DRL 代码 · 共 73 行

<?xml version="1.0"?>

<rule-set name="fibonacci"
          xmlns="http://drools.org/rules"
          xmlns:groovy="http://drools.org/semantics/groovy"
          xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
          xs:schemaLocation="http://drools.org/rules rules.xsd
                             http://drools.org/semantics/groovy groovy.xsd">

  <import>org.drools.examples.fibonacci.Fibonacci</import>

  <rule name="Bootstrap 1"   salience="20">
    <parameter identifier="f">
      <class>Fibonacci</class>
    </parameter>
    <groovy:condition>f.getSequence() == 1</groovy:condition>
    <groovy:condition>f.getValue() == -1</groovy:condition>
    <groovy:consequence>
      f.setValue( 1 );
      println f.getSequence() + " == " + f.getValue() ;
      drools.modifyObject( f );
    </groovy:consequence>
  </rule>

  <rule name="Bootstrap 2">
    <parameter identifier="f">
      <class>Fibonacci</class>
    </parameter>
    <groovy:condition>f.getSequence() == 2</groovy:condition>
    <groovy:condition>f.getValue() == -1</groovy:condition>
    <groovy:consequence>
      f.setValue( 1 );
      println f.getSequence() + " == " + f.getValue() ;
      drools.modifyObject( f );
    </groovy:consequence>
  </rule>

  <rule name="Recurse" salience="10">
    <parameter identifier="f">
      <class>Fibonacci</class>
    </parameter>
    <groovy:condition>f.getValue() == -1</groovy:condition>
    <groovy:consequence>
      println "recurse for " + f.getSequence() ;
      drools.assertObject( new org.drools.examples.fibonacci.Fibonacci( f.getSequence() - 1 ) );
    </groovy:consequence>
  </rule>

  <rule name="Calculate">
    <parameter identifier="f1">
      <class>Fibonacci</class>
    </parameter>
    <parameter identifier="f2">
      <class>Fibonacci</class>
    </parameter>
    <parameter identifier="f3">
      <class>Fibonacci</class>
    </parameter>
    <groovy:condition>f2.getSequence() == (f1.getSequence() + 1)</groovy:condition>
    <groovy:condition>f3.getSequence() == (f2.getSequence() + 1)</groovy:condition>
    <groovy:condition>f1.getValue() != -1</groovy:condition>
    <groovy:condition>f2.getValue() != -1</groovy:condition>
    <groovy:condition>f3.getValue() == -1</groovy:condition>
    <groovy:consequence>
      f3.setValue( f1.getValue() + f2.getValue() );
      println f3.getSequence() + " == " + f3.getValue() ;
      drools.modifyObject( f3 );
      drools.retractObject( f1 );
    </groovy:consequence>
  </rule>

</rule-set>