Identifying dam event of copy

Hello to everyone 

I'm facing a problem when i try to identify when dam events my requirement is that when an asset is being copied, moved or created we need to add a new property into the metadata of that asset, the method that i have is the next one, this method is in a class that implements EventHandler, DAMEventService.

public void handleEvent(Event event) {
 
 DamEvent damEvent = DamEvent.fromEvent(event);
 
 LOGGER.debug("********** EventType=" + damEvent.getType() + " === " + damEvent.getAssetPath());

 /* Use case when Creating Assets and Versioning Assets after DAM Update Asset Workflow finished processing */
 if(DamEvent.Type.DAM_UPDATE_ASSET_WORKFLOW_COMPLETED == damEvent.getType() ||
     /* Use case when Moving and Copying Assets after DAM Update Asset Workflow finished processing */
     DamEvent.Type.DAM_METADATA_WRITEBACK_WORKFLOW_COMPLETED == damEvent.getType() ||
     DamEvent.Type.ASSET_CREATED == damEvent.getType() ||
     DamEvent.Type.ASSET_MOVED == damEvent.getType() ||
     DamEvent.Type.VERSIONED == damEvent.getType()){
  
  this.callProcessNodeFromPath(damEvent);
  
 }
  
}

the workflows events are used to identify when an asset is begin uploaded and it was processed by DAM Update Asset workflow, but there is not a specific case for copy so I add create but that create a new problem, because asset_created is also trigger when an asset is uploaded and that is a problem because my listener and the workflow is trying to write the metadata properties at the same time and I get an exception.

metadataNode.setProperty(metadata_field, Value);

session.save();