code: @SuppressWarnings("unchecked")
  	public <T> void unlink(PushMeasure<T> measure) {
  		MeasureListener<T> listener = (MeasureListener<T>) linkedMeasures
  				.get(measure);
  		if (listener == null) {
  			// no registered listener
  		} else {
  			measure.unregister(listener);
  			linkedMeasures.remove(measure);
  		}
  	}
docs: If you have linked a {@link PushMeasure} through
  {@link #link(PushMeasure)}, you can discard the link by using this
  method.
  
  @param measure
  the {@link PushMeasure} to unlink