topic Re: Creating a task within a task in Alfresco Archive

Creating a task within a task

shikarishambu — Thu, 21 May 2015 16:14:54 GMT

I have a scenario where an user who is working on a task creates another task for a different person. Both these users can work on their tasks in parallel and they can complete in whatever orderWhat is the best way to handle this. Some questions I have are1. Should the second task be treated as a su

Re: Creating a task within a task

jbarrez — Thu, 28 May 2015 15:23:43 GMT

1. would be the way I would choose. If they can be completed in whatever order you probably keep it as flexible as possible.

Re: Creating a task within a task

shikarishambu — Fri, 12 Jun 2015 21:18:33 GMT

Thanks. I am now running into a different issue related to creating the second task as a subtask of the first. I need to list all tasks including subtasks under a process instance. It looks like the subtask is not associated to the process instance. And, I need to get all tasks first and then query each one for its subtasks. Is there a way to do this without having the query every task for its subtasks.

I did come across this old post - not sure if there is a ticket - http://forums.activiti.org/content/java-api-get-tasks-and-subtasks-processinstanceid. I will be happy to create one. Unfortunately the link from activity.org to the JIRA takes me here - https://www.codehaus.org/termination/#tocAnchor-1-3

Thanks

Re: Creating a task within a task

jbarrez — Tue, 16 Jun 2015 09:05:29 GMT

> It looks like the subtask is not associated to the process instance.

You can always set the process instance id on the newly created task.

Jira has moved to https://activiti.atlassian.net/secure/Dashboard.jspa

Re: Creating a task within a task

shikarishambu — Wed, 17 Jun 2015 15:56:20 GMT

Hi,
>You can always set the process instance id on the newly created task.

I am not sure how to set the process instance id explicitly on a newly created task. I don't see a setter for ProcessInstanceId on the task object

http://activiti.org/javadocs/org/activiti/engine/task/Task.html

Re: Creating a task within a task

shikarishambu — Fri, 19 Jun 2015 20:10:10 GMT

Is the way to set the Process instance id by casting it to TaskEntity? Also, how would I retrieve all tasks (including completed ones) for a process instance. It looks like the HistoryService/ HistoricTaskInstanceQuery doesn't have anything that returns tasks by Process Instance Id. Or, should I go the route of Task Service - taskService.createTaskQuery().processInstanceId(processInstanceId).list(); BTW, why is there a significant performance difference between using Task Service and History Service (faster) for same/similar operations

Re: Creating a task within a task

trademak — Sun, 21 Jun 2015 18:31:09 GMT

Yes, you need to cast to TaskEntity. HistoricTaskInstanceQuery has a processInstanceId method (it extends from TaskInfoQuery). Can you share your results of the performance difference?

Best regards,

Re: Creating a task within a task

shikarishambu — Mon, 22 Jun 2015 20:39:20 GMT

Hi,
Here are results from our testing

|Scenario | 5 Parent Tasks Each with 5 SubTasks | 5 Parent Tasks Each with 2 SubTasks| 5 parents, 2 parent Task with 5 SubTasks | 5parents, 2 parent task with 2 SubTasks|
|Only parent Task with TaskService | 281ms | 78ms | 110ms | 63ms |
|Including subTasks with TaskService | 765ms |508ms |436ms |345ms|
|Only parent Task with HistoryService | 47ms |180ms |47ms |33ms|
|Including subTasks with HistoryService| 566ms |546ms |703ms |799ms|

Hopefully, the formatting is ok.

I would be interested in learning what is the recommend/best way of accessing - all tasks/subtasks (associated to same process instance id) - both active and completed ones.

Thanks

Re: Creating a task within a task

trademak — Wed, 24 Jun 2015 21:16:06 GMT

Hi,

Thanks for sharing. Which db are you testing with?
I think the difference with retrieving the task via the task service could be that it will also load the identity links and some other data together with the task.

Best regards,

Re: Creating a task within a task

shikarishambu — Thu, 25 Jun 2015 17:41:00 GMT

SQL Server 2008 R2 running on Windows 2008 server