static L<Web> webs_readTripleFile_parallel(File f) {
  if (!f.exists()) ret ll();
  Iterator<S> l = linesFromFile(f);
  
  new L<S> names;
  while (it.hasNext()) {
    S s = trim(it.next());
    if (empty(s)) break;
    names.add(unquote(s));
  }
  
  final new L<Pair<Web, Int>> webs;
  
  int poolSize = numberOfCores(), queueSize = 1000;
  NotifyingBlockingThreadPoolExecutor e = new(poolSize, queueSize, 15, TimeUnit.SECONDS);
  
  try {
    int i = 0;
    for (fS s : l) {
      ++i;
      final int _i = i;
      e.execute(r { pcall {
        Web web = webs_readTripleFile_line(s, names);
        if (web != null) synchronized(webs) {
          webs.add(pair(web, _i));
        }
      }});
    }
    e.shutdown();
    e.awaitTermination(1, TimeUnit.DAYS);
  } finally {
    e.shutdown();
  }
  
  ret firstOfPairs(sortBySecondOfPairs_inPlace(webs));
}