code: private void loadAllWithAsyncLoader(final CacheOperationCompletionListener _listener, final Set<K> _keysToLoad) {
      final AtomicInteger _countDown = new AtomicInteger(_keysToLoad.size());
      EntryAction.ActionCompletedCallback cb = new EntryAction.ActionCompletedCallback() {
        @Override
        public void entryActionCompleted(final EntryAction ea) {
          int v = _countDown.decrementAndGet();
          if (v == 0) {
            _listener.onCompleted();
            return;
          }
        }
      };
      for (K k : _keysToLoad) {
        final K key = k;
        executeAsync(key, null, SPEC.GET, cb);
      }
    }
docs: Load the keys into the cache via the async path. The key set must always be non empty.
  The completion listener is called when all keys are loaded.