helloworld.java.drl

来自「drools 一个开放源码的规则引擎」· DRL 代码 · 共 60 行

<?xml version="1.0"?>

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

  <import>java.lang.Object</import>
  <import>java.lang.String</import>
  
  <java:functions>
  	public static void helloWorld(String hello)
  	{
  		System.err.println(hello + " World");
  	}

  	public static void goodbyeWorld(String goodbye)
  	{
  		System.out.println(goodbye + " Cruel World");
  	}
  </java:functions>

  <rule name="Hello World">
    <parameter identifier="hello">
      <class>String</class>
    </parameter>

    <java:condition>hello.equals("Hello")</java:condition>

    <java:consequence>
      helloWorld( hello );
    </java:consequence>
  </rule>

  <rule name="Goodbye Cruel World">
    <parameter identifier="goodbye">
      <class>String</class>
    </parameter>

    <java:condition>goodbye.equals("Goodbye")</java:condition>

    <java:consequence>
      goodbyeWorld( goodbye );
    </java:consequence>
  </rule>

  <rule name="Debug">
    <parameter identifier="object">
      <class>Object</class>
    </parameter>

    <java:consequence>
      System.out.println("Asserted object: " + object);
    </java:consequence>
  </rule>

</rule-set>