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Retrieving all tasks defined in a process definition via REST API

dvk78

I was trying to find out if it was possible to retrieve the list of all User tasks configured in a process definition/instance via the REST API.
From the user guide I could not determine if that is possible at all. Only the tasks that have been completed/current seem to be getting returned for runtime/tasks or runtime/executions.
I would like to know if it is possible via the REST API to retrieve all tasks in a process definition/instance.

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Comments

balsarori

I am not sure whether you want to retrieve task instances or task definitions (User Tasks defined in a process definition).

If you are referring to task instances, you can retrieve task instances of a specific process instance or process definition, check 15.8.12. Get historic task instances section in the Activiti User Guide
http://activiti.org/userguide/index.html

Use the processInstanceId parameter to get task instances of a specific process instance. Use the processDefinitionId parameter to get task instances of all process instances of a specific process definition. There are other parameters that you can use to filter results as needed.

If you are referring to task definitions, I don't think that is currently possible. However, you can retrieve the whole process definition (which will include all user tasks definitions) using

GET repository/process-definitions/{processDefinitionId}/model

dvk78

Thanks for responding balsarori.
For my situation, it would be ideal if I could retrieve all the 'User Tasks' that are defined in a process definition. If that is not possible, the alternative would be to retrieve all the 'User Tasks' that could be potentially associated to the process instance as per the process definition.
I guess it would boil down to API support that would involve parsing the bpmn xml and listing all the 'User Tasks' defined in it. If that support is not there, may be it could be built for a future release?

jbarrez

> l if I could retrieve all the 'User Tasks' that are defined in a process definition

Then you need to filter on process definition (id or key)

dvk78

I do not see any Task-related data in the REST response for a GET of a process-definition. Which API are you referring to?

balsarori

Check 15.3.5. Get a process definition BPMN model section in the user guide. Did you do a GET call to the following REST url?

repository/process-definitions/{processDefinitionId}/model

dvk78

Thanks. This works. I had tried repository/process-definitions/{processDefinitionId} . Missed the /model at the end.

arunk

How can we identify the tasks in the list is a user task(not a gateway or mail task etc,.)

amruta_holey

I am trying to fetch all tasks having specific processDefinitionId.
This is my url:
http://localhost:8080/activiti-rest/service/runtime/tasks?size=100000&processDefinitionId=reviewSaledLead:1:40
But tasks are not getting filtered by processDefinitionId. it giving me all tasks from ACT_RU_TASK table without filteration.
How to resolve this ?

amruta_holey

It is giving correct result when I filter it by processInstanceId but giving all task records from the table when I pass processDefinitionId as a url parameter

trademak

Correct, processDefinitionId is not a supported request parameter currently.
Instead, you could use processDefinitionKey for example.

Best regards,

jbarrez

I've added processDefinitionId last week.

amruta_holey

Thanks trademak, Can you please reply me with the example how i can use processDefinitionKey as parameter.

amruta_holey

Thanks jbarrez. Till the time we get next release of Acitiviti,
is there any other alternative way to get tasks list which are defined in process definition ?

jbarrez

no, process definition key is the only way I'm afraid. But you'll get the tasks for all the version for that particular key.

nmorado

this has been a while - but i am on same boat.

getting all user tasks from BpmnModel will give you statically the universe of tasks without considering conditional workflows - is my assumption correct?

If yes - then would we get all user tasks that are only valid based on conditional workflows and existing runtime parameters to process instance?

thanks