Async and await tasks take too much time

Issue

I need to call all APIs and store a local database before login. I used the sqflite plugin. can’t add background running, that’s why I used await.

1st running storeRegister() after process completed then running storeEquipmentReg likewise.

button onPressed():

await HelperDatabase1().storeRegister(_url, tokens);
await HelperDatabase1().storeEquipmentReg(_url, tokens);
await HelperDatabase1().storeGetUserPreference(_url, tokens);
await HelperDatabase1().storeDefRegisterCat(_url, tokens);
await HelperDatabase1().storeDefCatMaster(_url, tokens);
await HelperDatabase1().storeDefCatRelation(_url, tokens);
await HelperDatabase1().storeWoDescription(_url, tokens);
await HelperDatabase1().storeAssetAssembly(_url, tokens);
await HelperDatabase1().storeCategoryDefect(_url, tokens);
await HelperDatabase1().storeWorkSource(_url, tokens);
await HelperDatabase1().storeWorkTypes(_url, tokens);
await HelperDatabase1().storePriorities(_url, tokens);
await HelperDatabase1().storeSignIn(1);
await HelperSync().insert(_url, tokens);
await Helper().insert(token);
Navigator.pop(context);
Navigator.of(context).pushNamedAndRemoveUntil('/listView', (Route<dynamic> route) => false);

example storeCategoryDefect method:(All other code same)

   storeCategoryDefect(String url, String token) async {
    var db = await db1;
    Batch batch = db.batch();
    final response = await http.get(
      '$url/nativeapi/v1.0/CategoryDefect',
      headers: {'Authorization': 'Bearer $token'},
    );
    final jsonResponse = json.decode(response.body);
    CategoryDefect model = CategoryDefect.fromJson(jsonResponse);
    int length = model.data.length;

    for (int i = 0; i < length; i++) {
      var data = DataCategoryDefect(
        i: model.data[i].i,
        d: model.data[i].d,
      );
      batch.insert(
        'CategoryDefectTable',
        data.toMap(),
      );
    }
    await batch.commit();
  }

Solution

If you don’t need to execute them in a specific order, you can execute them simultaneously like:

await Future.wait([
  HelperDatabase1().storeRegister(_url, tokens),
  HelperDatabase1().storeEquipmentReg(_url, tokens),
  HelperDatabase1().storeGetUserPreference(_url, tokens),
  HelperDatabase1().storeDefRegisterCat(_url, tokens),
  HelperDatabase1().storeDefCatMaster(_url, tokens),
  HelperDatabase1().storeDefCatRelation(_url, tokens),
  HelperDatabase1().storeWoDescription(_url, tokens),
  HelperDatabase1().storeAssetAssembly(_url, tokens),
  HelperDatabase1().storeCategoryDefect(_url, tokens),
  HelperDatabase1().storeWorkSource(_url, tokens),
  HelperDatabase1().storeWorkTypes(_url, tokens),
  HelperDatabase1().storePriorities(_url, tokens),
  HelperDatabase1().storeSignIn(1),
  HelperSync().insert(_url, tokens),
  Helper().insert(token),
]);

If you need to order them, then create await Future.wait batch instead like your example. For example, first priorities inside the first Future.wait, seconds are after first Future.wait bla bla…

Answered By – Esen Mehmet

Answer Checked By – Candace Johnson (FlutterFixes Volunteer)