Question

我目前正在开始使用jbpm / drools并尝试使用＆＃34;业务规则任务＆＃34;从我的DRL修改一些流程变量。我尝试了以下过程，它声明了一个变量＆＃34; var＆＃34;类型＆＃34; MyCustomObject＆＃34;。

根据this question和this recommendation的结果，我创建了一个任务，该任务应该执行规则流组＆＃34; testgroup＆＃34;并具有以下onEntry脚本：

kcontext.getKnowledgeRuntime().insert(kcontext.getProcessInstance());

我的DRL现在看起来像这样：

import mypackage.MyCustomObject;
import org.kie.api.runtime.process.WorkflowProcessInstance;

rule "generate object"
ruleflow-group "testgroup"

when
  //some stuff applies
then
  insert(new MyCustomObject());
end

rule "modify variable"
ruleflow-group "testgroup" 

when
  $process: WorkflowProcessInstance()
  $obj: MyCustomObject()
then
  WorkflowProcessInstance $p = (WorkflowProcessInstance)kcontext.getKieRuntime().getProcessInstance($process.getId());
  $p.setVariable( "var", $obj);
  System.out.println("Value of object in memory: "+$obj);
  System.out.println("Value of object in variable:+$p.getVariable("var"));
  retract($process);
end

在业务规则任务之后，我放置了一个简单的脚本任务：

if(var != null) {
  System.out.println("var: "+var);
} else{
  System.out.println("var is null!");  
}

我现在得到的输出（注意：MyCustomObject不会覆盖toString）：

对象在内存中的值：MyCustomObject @ XYZ

变量中对象的值：MyCustomObject @ XYZ

var为null！

此时我不知道，出了什么问题。正如输出所暗示的那样，工作内存中的ProcessInstance已正确设置其变量，但该过程本身不存在该值（其他节点可以访问）。

其他信息：

我目前在JBoss EAP 6.4上使用工作台版本6.4.0.Final，并将容器部署到在单独的EAP 6.4实例上运行的KieExecutionServer（6.4.0.Final）。

任何建议都表示赞赏。

Answer 1

将名为qrr的Object类型的变量添加到您的流程

在业务规则任务的onEntry脚本中：

// Add the process instance into working memory so we can access it from rules!!!
insert(kcontext.getProcessInstance());

// get the current process context (the running process) where I have already
// defined a variable named qrr as a type Object.
org.jbpm.workflow.instance.WorkflowProcessInstance pi = (org.jbpm.workflow.instance.WorkflowProcessInstance)kcontext.getProcessInstance();

// create a new array list
qrr = new java.util.ArrayList();

// to be able to access qrr from the business process I set the new qrr
// instance to the BP variable named qrr
pi.setVariable("qrr", qrr);

// log to log file    
System.out.println("=======> qrr inserted ");

规则示例

rule "check states"
ruleflow-group "build-results"
dialect "java"
when
  /* when there is an object of type PatientState with an attribute named trasferrable(boolean) equals to true in the working memory */
  $s : PatientState(trasferrable==true)
then

  String str = "We found our PatientState in working memory and it has transferable==true!";

  /* get the process context we inserted into the working memory before we ran our business rule task with ruleflow: build-results */
  Object o = drools.getContext(org.kie.api.runtime.process.ProcessContext.class);

  if (o != null) {
    // we found the ProcessContext in working memory so cast it and than get our variable named qrr and cast it as well
    List qrr = (List)drools.getContext(org.kie.api.runtime.process.ProcessContext.class).getVariable("qrr");
    // add the string object to the list
    qrr.add(str);
  }
  else {
    LoggerUtil.info("Context not found in working memory");
  }
end

现在在你的onExit脚本中只写出类似的东西：

System.out.println（＆＃34; ######## qrr包含：＆＃34; + qrr.size（）+＆＃34;规则结果########＆＃34）;

HTH，伽

无法从DRL更新jbpm进程变量

1 个答案:

规则示例