code: public void runDecider(String workflowId) {
          Preconditions.checkArgument(StringUtils.isNotBlank(workflowId), "workflow id cannot be blank");
          put("workflow/decide/{workflowId}", null, null, workflowId);
      }
docs: Starts the decision task for the given workflow instance
  
  @param workflowId the id of the workflow instance