docs: @GuardedBy("writeLock")
     private void updateFileList(FileListCacheValue fileList) {
        if (writeAsync) {
           cacheNoRetrieve.putAsync(fileListCacheKey, fileList);
        }
        else {
           if (trace) {
              log.tracef("Updating file listing view from %s", getAddress(cacheNoRetrieve));
           }
           cacheNoRetrieve.put(fileListCacheKey, fileList);
        }
     }