code: public List<AssetProcessor> pipeline(final String dist) {
      List<AssetProcessor> chain = this.pipeline.get(dist);
      if (chain == null) {
        log.debug("no pipeline for: {}", dist);
        return Collections.emptyList();
      }
      return Collections.unmodifiableList(chain);
    }
docs: List all the {@link AssetProcessor} for a distribution (a.k.a. environment).
  
  @param dist Distribution's name.
  @return A readonly list of available {@link AssetProcessor}.