Question

使用insert方法，我可以将值从Java传递给Drool文件，但是在操作之后我想要从Drool文件返回值。

Answer 1

您无法从drool文件中返回任何内容。它的工作原理是参考。以下3个活动来自您的java类：

在KieSession中插入事实数据
使用事实数据

在规则被触发后使用事实数据

class TdpFactData{
   private int age ....
           getter , setters ....
    }
      ----------------------------------------
 TdpFactData factData=new TdpFactData();

 kieSession.insert(factData); Fact data is inserted in kiesession for the drool to use 

 kieSession.fireAllRules(); // Here the drool file executes 

 // Fact data got changed based on the rules 
 //Utilize the fact data again in java code .

Answer 2

您可以使用GetObjectsCommand对象从Drool会话中获取值。为此，请首先从kiecontainer创建一个会话对象。

KieServices ks = KieServices.Factory.get();
        KieContainer kieContainer = ks.getKieClassPathContainer() ;
    String session = "session" //session name from kmodeule.xml
    StatelessKieSession session = kieContainer.newStatelessKieSession(sessionName);
    List<Command<?>> cmds = new ArrayList<Command<?>>();
        KieCommands commands = KieServices.Factory.get().getCommands();
        cmds.add(commands.newInsert("hi)); //insert all POJO here.

        GetObjectsCommand getObjectsCommand = new GetObjectsCommand();
        getObjectsCommand.setOutIdentifier("objects");


        cmds.add(commands.newFireAllRules());
        cmds.add(getObjectsCommand);

        BatchExecutionCommand myCommands = CommandFactory.newBatchExecution(cmds);
        ServiceResponse<ExecutionResults> response = session.executeCommandsWithResults( myCommands);

        List responseList = (List) response.getResult().getValue("objects");
    //the response list will contain the objects present plus inserted via drool engine.

如何从Java中的Drool文件中获取价值

2 个答案: