code: public void setProcessorPoolId(String processorPoolId) {
          if (logger.isTraceEnabled())
              logger.trace("Setting processorPoolId to " + processorPoolId);
          this.processorPoolId = processorPoolId;
      }
docs: Sets the processor pool id for this workflow instance. Changes get active at the next enqueue of this workflow
  instance.
  You may initiate an enqueue using {@link Workflow#resubmit()}
  
  @param processorPoolId
  id of the proccesor pool as specified in the configuration