@Override
    public void barrierConsumer(final TraverserSet<S> traverserSet) {
        this.barrierConsumer.accept(traverserSet);
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/LambdaCollectingBarrierStep.java