topic Re: Converting process instance from JSON to BpmnModel in Alfresco Archive

Converting process instance from JSON to BpmnModel

medovarszki — Mon, 26 Oct 2015 17:25:40 GMT

Hi all,I got a JSON representation of a process instance from the Activiti REST (see the attached 'process.json')I want to create a diagram representation from this JSON with highlighted process history (tasks and flow elements), so I'd like to parse this JSON to a BpmnModel object (processDefJson c

Re: Converting process instance from JSON to BpmnModel

jbarrez — Wed, 28 Oct 2015 19:14:33 GMT

Which REST endpoint did you use to get this json? The BpmnJsonConverter is used to convert the json coming from the Modeler to XML/BpmnModel. But the format seems not to be correct.

Re: Converting process instance from JSON to BpmnModel

medovarszki — Thu, 29 Oct 2015 09:34:04 GMT

I get the definition ID from the process instance as the following way:
<java>
//processInstanceId given as a function parameter

Representation processInstance = WorkflowUtils.getClientResource("runtime/process-instances/" + processInstanceId).get(MediaType.APPLICATION_JSON);
JsonElement processInstanceJson = WorkflowUtils.getAsJsonElement(processInstance);

Representation processDefinition = WorkflowUtils.getClientResource("repository/process-definitions/" + processInstanceJson.getAsJsonObject().get("processDefinitionId").getAsString()).get(MediaType.APPLICATION_JSON);
JsonElement processDefinitionJson = WorkflowUtils.getAsJsonElement(processDefinition);

Representation procDefRepresentation = WorkflowUtils.getClientResource("repository/process-definitions/" + processDefinitionJson.getAsJsonObject().get("id").getAsString() + "/model").get(MediaType.APPLICATION_JSON);
JsonElement processDefJson = WorkflowUtils.getAsJsonElement(procDefRepresentation);
</java>

Re: Converting process instance from JSON to BpmnModel

jbarrez — Tue, 03 Nov 2015 12:16:58 GMT

Ok, so the /repository/process-definitions/{processDefinitionId}/model gives back the BpmnModel representation, which does not contain any shapes or so, this is simply a JSON representation of the BPMNModel (ie the xml of the process definition).

The BpmJsonConverter does NOT work on that JSON, but on the JSON produced by for example the Modeler.

Re: Converting process instance from JSON to BpmnModel

medovarszki — Wed, 04 Nov 2015 08:13:10 GMT

Ok I understand. I found a possible solution: I can use the /repository/process-definitions/{processDefinitionId}/resourcedata endpoint which returns the model with shapes and so in XML format. Then I parse it with BpmnXMLConverter to BpmnModel.