DAM Update Asset Workflow

I have modified the DAM Update Asset Workflow  and now we have a situation where the workflow stops in between and hence the asset is no longer part of the workflow. Now I have written a code to start the workflow if the asset is not in the workflow. 

Now my question is, how do we check if the asset is a part of the workflow or not. I will start the workflow only if the asset is not a part of the workflow. Please help me with the java code.

                //Check if asset is not in WorkFlow ---  1
                {
                  //start the workflow
                   invokeWorkFlow(WORKFLOWPATH,assetMetadatPath,workflowSession);
                   
                }else{
                        //do nothing

                }

My question is for point 1.