private static void ensureContributorsLoaded() {
    if (!ourContributorsLoaded) {
      synchronized (ourBindings) {
        if (!ourContributorsLoaded) {
          for (MetaDataContributor contributor : MetaDataContributor.EP_NAME.getExtensionList()) {
            contributor.contributeMetaData(MetaDataRegistrar.getInstance());
          }
          ourContributorsLoaded = true;
        }
      }
    }
  }
private static void ensureContributorsLoaded()