@Override
    public Stream<E> stream() {
      synchronized (mutex) {
        return delegate().stream();
      }
    }

    @Override
    public Stream<E> parallelStream() {
      synchronized (mutex) {
        return delegate().parallelStream();
      }
    }

    @Override
    public void forEach(Consumer<? super E> action) {
      synchronized (mutex) {
        delegate().forEach(action);
      }

                }
            }));

            // Eagerly resolve all plugins in parallel
            toResolve.parallelStream().forEach(Runnable::run);

            // Keep track of phase aliases
            lifecycle.aliases().forEach(alias -> plan.aliases().put(alias.v3Phase(), alias.v4Phase()));

            return plan;
        }