code: private static void addCacheDetailsEntry(SlotReference slot, ZipOutputStream zos, WritableByteChannel channel) throws IOException {
          // Record the details of the media being cached, to make it easier to recognize now that we can.
          MediaDetails details = MetadataFinder.getInstance().getMediaDetailsFor(slot);
          if (details != null) {
              zos.putNextEntry(new ZipEntry(CACHE_DETAILS_ENTRY));
              Util.writeFully(details.getRawBytes(), channel);
          }
      }
docs: Record the details of the media being cached, to make it easier to recognize, now that we have access to that
  information.
  
  @param slot the slot from which a metadata cache is being created
  @param zos the stream to which the ZipFile is being written
  @param channel the low-level channel to which the cache is being written
  
  @throws IOException if there is a problem writing the media details entry