docs: public void setExternalCacheFragment(ExternalInvalidation externalCacheFragment) {
          if (tc.isEntryEnabled())
              Tr.entry(tc, "setExternalCacheFragment: {0}", externalCacheFragment.getUri());
          externalCacheFragment = invalidationAuditDaemon.filterExternalCacheFragment(ServerCache.cache.getCacheName(), externalCacheFragment);
          if (externalCacheFragment != null) {
              batchUpdateDaemon.pushExternalCacheFragment(externalCacheFragment, ServerCache.cache);  
          }
          if (tc.isEntryEnabled())
              Tr.exit(tc, "setExternalCacheFragment: {0}", externalCacheFragment.getUri());
      }