gistfile1.txt

   // inner-class, extends possibility of async (since only one can be extended at the time)
    // private so can't be a loose-filed class..
    // populates the DB with a dao coming from other thread(?)
    private static class PopulateDbAsync extends AsyncTask<Void, Void, Void> {

        private final StorageDao sDao;

        PopulateDbAsync(StorageDatabase db) { sDao = db.storageDao(); }

        @Override
        protected Void doInBackground(final Void... params) {
            sDao.deleteAll();
            Storage storage = new Storage();
            sDao.insert(storage);
            storage = new Storage();
            sDao.insert(storage);
            return null;
        }
    }