topic Re: How to retrieve business key from task delegate in Alfresco Archive

How to retrieve business key from task delegate

yangyang_qian — Tue, 22 Mar 2011 19:57:29 GMT

Our web app currently starts a process with a business key … String processName = getProcessName();String businessKey = getBusinessKey();ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();RuntimeService runTimeService = processEngine.getRuntimeService();ProcessInstance processIns

Re: How to retrieve business key from task delegate

dankre — Wed, 23 Mar 2011 07:47:24 GMT

Hi,

I have not tested it. Propably you can give it a try. You have to inject an instance of your runtimeService to your Tasklistener.


ProcessInstanceQuery processInstanceQuery = runtimeService.createProcessInstanceQuery();
ProcessInstance result = processInstanceQuery.processInstanceId(delegateExecution.getProcessInstanceId()).singleResult();
String businessKey = result.getBusinessKey();

Regards,
Daniel

Re: How to retrieve business key from task delegate

frederikherema1 — Wed, 23 Mar 2011 08:10:26 GMT

That's not a good idea… You shouldn't use activiti API from within TaskListeners (nor from ExecutionListeners or JavaDelegates), this can mess up transactions.

The only way I can think of is casting the DelegateExecution (delegateTask.getExecution()) to the Impl and going all the way up to the root execution (which is the process-instance) and get the business-key from there.

Re: How to retrieve business key from task delegate

yangyang_qian — Wed, 23 Mar 2011 14:21:47 GMT

Ah ok, didn't realize there wasn't a built-in way to grab the business key from the DelegateTask …

I think to play it safe I'll just stick with putting the business key in the variables map …


public class GenericRequest {
…
…
private void startWorkflow() {
  String processName = determineProcessNameFromFields();
  ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();
  RuntimeService runTimeService = processEngine.getRuntimeService();
  ProcessInstance processInstance = runTimeService.startProcessInstanceByKey(
            processName, 
            this.businessKey,
            CollectionUtil.singletonMap( 
              "RequisitionId", 
              this.businessKey 
            ) 
           );
 }
…
…
}

and just retrieve it using getVariable


public class GenericHumanTaskListener implements TaskListener {
…
…

 @Override
 public void notify (DelegateTask delegateTask) {
  String wfeTaskID = delegateTask.getId();
  String taskName = delegateTask.getName(); 
  String businessKey = delegateTask.getVariable("RequisitionId").toString();
                …
  
 }
…
… 
 
}

Thanks for the suggestions!

Re: How to retrieve business key from task delegate

frederikherema1 — Thu, 24 Mar 2011 07:00:36 GMT

Yes, that's the safest. Maybe you can file an issue in our JIRA, because it should be easier to get business-key for a certain task/delegateTask

Re: How to retrieve business key from task delegate

yangyang_qian — Fri, 25 Mar 2011 16:39:21 GMT

Posted http://jira.codehaus.org/browse/ACT-730 to Jira