How to loop through Element Types of Model Instance and Add Extension Elements

Camunda 7 Topics Discussion & Questions
1

consider the following:

    def sequenceFlows = model.getModelElementsByType(org.camunda.bpm.model.bpmn.instance.SequenceFlow.class).collect {it.getId()}
    println '\nSequence Flows:'
    println sequenceFlows
    sequenceFlows.each {
      def sequenceFlow = model.getModelElementById(it)
      sequenceFlow.builder().addExtensionElement(extLis)
    }

I am using the following as reference:

The issue is that it seems that you cant update the model a second time? Only the last update to the model in the loop is kept. Previous writes are overwritten with the original model.

Missing something?

2

Well that was very painful…

so the issue is the instance of the ExecutionListener had to be created everytime you wanted to insert. I was only creating it once; as i was assuming that it was a generic instance that could be applied… that was the wrong assumption…

so solution snipper of code is

  def addExecutionListener(model, elementId, scriptResource, scriptFormat){
    // @TODO NOTE: The estLis had to be new for every instance
    CamundaExecutionListener extLis = model.newInstance(CamundaExecutionListener.class);
    CamundaScript camScript = model.newInstance(CamundaScript.class);
    camScript.setCamundaResource(scriptResource)
    camScript.setCamundaScriptFormat(scriptFormat)
    extLis.setCamundaEvent('take')
    extLis.setCamundaScript(camScript)

    def newModel = model.getModelElementById(elementId).builder().addExtensionElement(extLis).done()
    return newModel
  }

  def setupSequenceFlowListeners(model, scriptResource, scriptFormat){

    def sequenceFlows = model.getModelElementsByType(org.camunda.bpm.model.bpmn.instance.SequenceFlow.class).collect {it.getId()}

    def newModel = model
    sequenceFlows.each {
      newModel = addExecutionListener(newModel, it, scriptResource, scriptFormat)
    }
    return newModel
  }

def preppedModel = setupSequenceFlowListeners(myBpmnModelInstance, 'deployment://flownode.js', 'javascript')

Note: this was mainly painful because it seems the Model API does not throw a error when trying to add the same Extension instance into a Model more than once.

3