StarWarsService.java

public class StarWarsService extends IntentService {

  @Inject AppDatabase db;

  public StarWarsService() {
    super("StarWarsService");
  }

  @Override public void onCreate() {
    super.onCreate();
    ((StarWarsApplication) getApplication()).getAppComponent().inject(this);
  }

  @Override protected void onHandleIntent(Intent intent) {

    if (intent != null) {
      String json = ResourcesUtil.loadJson(this);
      Gson gson = new GsonBuilder().setDateFormat("MMM d, yyyy").create();
      ArrayList<StarWarsMovie> moviesList =
          gson.fromJson(json, new TypeToken<ArrayList<StarWarsMovie>>() {
          }.getType());

      db.beginTransaction();
      try {
         db.starWarsMovieModel().deleteAll();
            for (StarWarsMovie starWarsMovie : moviesList) {
              db.starWarsMovieModel().insertMovie(starWarsMovie);
            }
        db.setTransactionSuccessful();
      }
      finally {
         db.endTransaction();
      }
    }
  }
}