topic What is the correct place for custom Task & Process Def attributes? in Alfresco Archive

What is the correct place for custom Task & Process Def attributes?

jwestra — Tue, 05 Apr 2016 02:02:09 GMT

I need to add few 'metadata' fields to my Process and Task Definitions. Just wondering if ExtensionAttributes are where I'd do this?Here are two examples:1. PermissionToStartProcess - we need to indicate a "Permission" to start the process (example: "Manage Special Events" permission). It is a Str

Re: What is the correct place for custom Task & Process Def attributes?

jbarrez — Thu, 07 Apr 2016 10:02:16 GMT

That would need to go into the extensionElements (or maybe extensionAttributes). That's what they are for in the BPMN specification.
You indeed will need to go via the BpmnModel to look these up.

Re: What is the correct place for custom Task & Process Def attributes?

jwestra — Thu, 07 Apr 2016 16:31:13 GMT

OK. Here's the plan then:

In task listeners that need access to my custom extensions (e.g. AutoAssignTaskListener), I will take the ProcessDefinition ID from the DelegateTask and query the RepositoryService to get the BpmnModel containing these extensions.

<code>
BpmnModel model = RepositoryService.getBpmnModel(processDefinitionId)

// get Process from model
// get FlowElement for the DelegateTask my task listener is handling
// get ExtensionElements and/or ExtensionAttributes for the FlowElement
// verify the value and run logic on it (e.g., isAutoAssignOnCreate == true) then auto-assign it!
</code>

My concern is that loading the BpmnModel each time my AutoAssignTaskListener.notify() is invoked will be costly. Does Activiti have a "cache by ProcessDefinitionId" for the BpmnModels , which would eliminate call to the Repository DB tables constantly?

Re: What is the correct place for custom Task & Process Def attributes?

jbarrez — Tue, 12 Apr 2016 09:18:06 GMT

Yes, all process definitions are cached, so no database call will be made.