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Define Required Process Variables and Get Information on those before instantiating a ProcessDefinition

ksgphellow

Hello there,

Is there a possibility in Activiti to define certain Process Variables as Required in a Process Definition and request a list of those required variables from a Process Definition?

The Reason I'm asking is, I want to make some sort of Process Repository for Process selection.

Since my Processes more often than not need different variables or different numbers of variables, I want to show form that dynamically adjusts for how many / which variables are needed to my user.

Is there a functionality like that in Activiti or can someone recommend a solution?

thanks in advance

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Alfresco Process Services

Accepted answers

unknown

If your goal is only to define a list of variables used in the process in the process, I think that Data objects is optimal.
https://www.activiti.org/userguide/#dataobjects

And, you can get that list by the following code.

List<ValuedDataObject> dataObjects = repositoryService.getBpmnModel("processDefinitionId").getProcessById("processDefinitionKey").getDataObjects();
for(ValuedDataObject dataObject: dataObjects){
  System.out.println(dataObject.getId());
  System.out.println(dataObject.getName());
  System.out.println(dataObject.getType());
}   ad

All comments

ryandawson

Sounds like a use-case for start-forms with the forms set to have some required properties - I'd suggest to have a look at Activiti User Guide and see if it's a fit

ksgphellow

I'd agree with you, but I have, and need to have my own Implementation of forms and not in java, so I cant really use those.

Thanks for the Idea though.

Are there any other possibilities ?

The main thing I need, is to just define required process variables and prompt them when looking up what process definitions I have in my repository.

Thanks in advance

ryandawson

Basically you want to store a list of the required process variables against each process definition. If that information will be in your forms then maybe you can find a way to get access to it from java or have the forms and the java get it from a common source. If it won't be in the forms or you can't get it then I guess basically you just need to capture it in a way the java can get it. If you've only a small amount of data then maybe you could put it in a properties file and check against it before you make the call to start a process. If it's more data then maybe a database table. I can't think of an Activiti-native way of doing this - probably because the Activiti way would be Activiti forms (but it's possible there is one and I'm missing it).

ksgphellow

Okay thanks,

I'll think of something.

Shame that Activiti Process Definitions cant be prompted for something like that. Would be a really nice feature.

Thanks again for your help.

unknown

If your goal is only to define a list of variables used in the process in the process, I think that Data objects is optimal.
https://www.activiti.org/userguide/#dataobjects

And, you can get that list by the following code.

List<ValuedDataObject> dataObjects = repositoryService.getBpmnModel("processDefinitionId").getProcessById("processDefinitionKey").getDataObjects();
for(ValuedDataObject dataObject: dataObjects){
  System.out.println(dataObject.getId());
  System.out.println(dataObject.getName());
  System.out.println(dataObject.getType());
}   ad

ksgphellow

Ah thanks, tried around a bit with those, hadnt had the idea to get them via the bpmn model.

Yeah getting that far is atleast a good first step for my usecase, I'll be able to build up on top of that.

Thanks alot for your help.

ksgphellow

Might be a stupid Question, but: Am I correct in that the DataObjects can only be defined programmatically or in the xml file ? and not in the Activiti Editor?

Thanks

unknown

All you can use.

programmatically
xml file
Activiti Editor/Activiti Designer

ksgphellow

Hm okay, didnt find it in the editor, strange. Okay I'll have a look again.

Thank you.

unknown

I'm sorry that Data Object setting diappear from Activiti Editor...

ksgphellow

Ok, thanks for the info, no worries.

I'll just define the data objects in xml.

Thanks again.