topic Re: Any way to get reference to created task from task create listener? in Alfresco Archive

Any way to get reference to created task from task create listener?

neville_sequeir — Wed, 28 Aug 2013 22:12:53 GMT

Maybe its a silly question and the obvious answer might be that the task being queried for has not yet been committed to the database.The question is, why do I get back null‍ for the Task retrieved from the task query in the code below? I have hooked this as a listener for task create event on the c

Re: Any way to get reference to created task from task create listener?

neville_sequeir — Thu, 29 Aug 2013 14:44:22 GMT

I happened to stumble on http://www.jorambarrez.be/blog/2012/10/25/call-a-service-in-a-service-tas/
I am using Activiti version 5.13, which should include the fix mentioned at that link.
Based on what is mentioned at the said link, I would expect my code to work. Or could it be that my code taskService.createTaskQuery() is somehow still being executed against a newly created transaction different from the one that is already running?

I guess its time to add some more break points 😞

Re: Any way to get reference to created task from task create listener?

neville_sequeir — Tue, 03 Sep 2013 18:22:24 GMT

Verified that no extra/unnecessary transactions are being created.
Kind of stuck on this.
Could someone help please?

Re: Any way to get reference to created task from task create listener?

frederikherema1 — Wed, 04 Sep 2013 09:44:18 GMT

Why do you need the Task object? you have access to the DelegateTask, which holds all info related to the current task…

Re: Any way to get reference to created task from task create listener?

neville_sequeir — Wed, 04 Sep 2013 17:00:45 GMT

Yeah, I know about DelegateTask.
However we are migrating from jBPM3, and long story short, being able to get a reference to the Activiti Task object from within the task listener will allow us to continue having certain functionality that we currently have.

What exactly is the reason the task service returns <code>null</code> in my scenario? Is this is a bug? Should I report in Activiti JIRA?

Re: Any way to get reference to created task from task create listener?

trademak — Fri, 06 Sep 2013 17:46:10 GMT

Hi,

What Frederik is saying is that the DelegateTask object is the Task object, so why can't you use the DelegateTask object?
It's true that you can't query for the task yet, because it was not flushed to the database yet. But the DelegateTask object is the object that will be persisted to the database and it already contains the id, so what would you need more?

Best regards,

Re: Any way to get reference to created task from task create listener?

neville_sequeir — Fri, 06 Sep 2013 18:37:16 GMT

Got it. Thanks for the clarification.
The queries executed using services like TaskService go directly to the database and the Task object, whose creation caused my listener to be called, has not been flushed to the db yet. I am kind of too used to the persistence context cache from JPA.

Performance being a crucial aspect for us, I was thinking if I get a reference to the Task object, I can avoid having to create another of our own class to copy the id and other properties from DelegateTask object.

Would I be hoping against hope if I asked if there was way to cause the flush to happen before my task listener is called by Activiti ?
As an alternative, will it be reasonable for me to hold a reference to the DelegateTask instead ?

Re: Any way to get reference to created task from task create listener?

jbarrez — Fri, 13 Sep 2013 07:42:44 GMT

You can flush, but you will need to cast to get hold of the DbSQLSession from the ProcessEngineConfigurationImpl. However, I wold strongly advise against it as it might have unforseen consequences.

I don't follow the reasoning why you want to keep a reference and why it has impact on performance. What's the use case you are trying to fulfil?

Re: Any way to get reference to created task from task create listener?

neville_sequeir — Fri, 13 Sep 2013 15:28:29 GMT

Hi jbarrez,

Please see http://forums.activiti.org/content/spring-jpatransactionmanager-not-saving-activiti-entities-db
I have attached a small project to that thread on Tijs's request.

Re: Any way to get reference to created task from task create listener?

krolikzaia — Tue, 11 Dec 2018 16:47:54 GMT

How to catch event of record in the table, please tell me.

Is it possible when creating a task,?
I want to send a message to the user that a task has been assigned to him?

activiti 6

public class MyTaskCreateListener implements TaskListener {
@Override
public void notify(DelegateTask delegateTask) {
TaskService activitiTaskService = delegateTask.getExecution().getEngineServices().getTaskService();
Task theActivitiTask = activitiTaskService.createTaskQuery().taskId(delegateTask.getId()).singleResult();
sendMessageToUser(delegateTask.getId());
}
}
receive client:
activitiTaskService.createTaskQuery().taskId(new_taskId).singleResult() it null
?

Re: Any way to get reference to created task from task create listener?

krolikzaia — Tue, 11 Dec 2018 20:53:21 GMT

resolved

/thread/224440-sending-an-email-after-user-task-is-created