Drools规则引擎实践-优快云博客

时间转瞬，好恐怖，十月了

#created on: 2009-10-3
package com.sample

#试问 package有什么用？
#list any import classes here.

#declare any global variables here

rule "Your First Rule"

when
  #conditions
then
  #actions
  System.out.println("2009年10月3日1:10:56");
end

package com.sample

import com.sample.DroolsTest.Message;

rule "Hello World"
when
  m : Message( status == Message.HELLO, message : message )
then
  System.out.println( message );
  m.setMessage( "Goodbye cruel world" );
  m.setStatus( Message.GOODBYE );
  update( m );
end

rule "GoodBye"
no-loop true
when
  m : Message( status == Message.GOODBYE, message : message )
then
  System.out.println( message );
  m.setMessage( message );

end

  Reader source = new InputStreamReader( DroolsTest.class.getResourceAsStream( "/Sample.drl" ) );

  //optionally read in the DSL (if you are using it).
  //Reader dsl = new InputStreamReader( DroolsTest.class.getResourceAsStream( "/mylang.dsl" ) );

  //Use package builder to build up a rule package.
  //An alternative lower level class called "DrlParser" can also be used...

  PackageBuilder builder = new PackageBuilder();

  //this wil parse and compile in one step
  //NOTE: There are 2 methods here, the one argument one is for normal DRL.
  builder.addPackageFromDrl( source );

  //添加第二个
  source=new InputStreamReader(DroolsTest.class.getResourceAsStream("/chen.drl"));

     builder.addPackageFromDrl(source);

试问：drl文件中，package有什么作用？

问题二：Drools中的RuleAgent路径？

使用RuleAgent进行部署！

路径为何是这样的呢？

chen.properties 居然可以这样子使用了！

newInstance=true
dir=/E:/WorkSpace/eclipse32/WebAgent/WebRoot/WEB-INF/classes/rules/

或者：dir=WebRoot/WEB-INF/classes/rules 其中后面的rules为您文件夹...

结果输出：

file:/E:/WorkSpace/eclipse32/WebAgent/WebRoot/WEB-INF/classes/rules/Hello.drl
RuleAgent(default) INFO (Sat Oct 03 22:03:25 CST 2009): Configuring with newInstance=true, secondsToRefresh=-1
RuleAgent(default) INFO (Sat Oct 03 22:03:25 CST 2009): Configuring package provider : DirectoryScanner scanning dir: E:\WorkSpace\eclipse32\WebAgent\WebRoot\WEB-INF\classes\rules found 2 file(s).
RuleAgent(default) INFO (Sat Oct 03 22:03:27 CST 2009): Applying changes to the rulebase.
RuleAgent(default) INFO (Sat Oct 03 22:03:27 CST 2009): Creating a new rulebase as per settings.
RuleAgent(default) INFO (Sat Oct 03 22:03:27 CST 2009): Adding package called com.chen
RuleAgent(default) INFO (Sat Oct 03 22:03:27 CST 2009): Adding package called com.chen.rules
Drools 测试RuleAgent 2009年10月3日21:50:46
中秋节...

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