Drools使用dsl语言

[when] There is a person = $p:Person()
[when] - id greater than {id:\d*} = id > {id}
[then] print = System.out.println("I am fired!")

[<scope>][<type definition>]<dsl expression>=<replacement text>
其中
[when] or [condition] 定义的语法应用于LHS
[then] or [consequence] 定义的语法应用于RHS
[*]  以上两者都适用
[keyword] 关键字，比如no-loop这一类属性

rule 'test-dsl'

when
    There is a person
    - id greater than 10
then
    print
end

public class Demo14 extends BaseDemo {

	public static void main(String[] args) throws IOException, DroolsParserException {

		String dslContent = "[when] There is a person = $p:Person()\n" +
				"[when] - id greater than {id:\\d*} = id > {id}\n" +
				"[then] print = System.out.println(\"I am fired!\")";

		String dslrContent = "rule 'test-dsl'\n" +
				"\n" +
				"when\n" +
				"    There is a person\n" +
				"    - id greater than 10\n" +
				"then\n" +
				"    print\n" +
				"end";

		DefaultExpanderResolver resolver = new DefaultExpanderResolver(new StringReader(dslContent));

		DrlParser parser = new DrlParser();

		String string = parser.getExpandedDRL(dslrContent,resolver);

		System.out.println(string);

	}
}

rule 'test-dsl'

when
    $p:Person(id > 10)
then
    System.out.println("I am fired!")
end

rule 'test-dsl'
expander demo.dsl
when
    There is a person
    - id greater than 10
then
    print
end