CODEWITHSUNDEEP
camunda
Varda
Varda

Reputation: 69

Retrieving a process Instance diagram in Camunda

I have been trying to retrieve a process instance diagram from Camunda engine. All the JAVA and REST methods deal with retrieving the deployed process diagram. So, the closest I am is this method.

InputStream getProcessDiagram(String processDefinitionId)

But its of no use to me as I want to be able to get the current state of the particular process instance.

The process diagram representing the current state can be viewed in Camunda Tasklist but I have no clue as to how to retrieve it.

Thanks!

Upvotes: 2

Views: 3815

Answers (1)

thorben
thorben

Reputation: 1587

The diagram with its state does not simply come from the REST API as is. Instead, data from two sources is collected:

  • GET /process-definition/{id}/xml provides the BPMN diagram (which you have already found) [1]
  • GET /process-instance/{id}/activity-instances provides the state of a process instance in a tree structure [2]

The tasklist has some client-side logic that renders the BPMN XML with bpmn.io and places markers on top of it based on the activity instance tree.

Upvotes: 6

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