Storage

Mobile SDKs for feature management and experimentation are designed to operate efficiently on Flutter applications. Mobile SDKs utilize built-in storage to manage feature flags and experimentation data.

Purpose of Storage

The primary purpose of using storage in mobile SDKs is to enhance performance and ensure a consistent user experience. By caching feature flag decisions locally, mobile applications can quickly access necessary data without repeatedly querying the server.

Key Benefits

• Consistent User Experience: Persisting feature flag decisions ensures that users have a consistent experience, even if they close and reopen the app.
• Decision Stability: Once a decision is made for a user, it remains consistent, even if campaign settings are modified. This stability is crucial for accurate A/B testing and controlled feature rollouts.
• Performance Improvement: Caching decisions locally reduces the need for constant server communication, leading to faster response times and a smoother user experience.

Implementation in Flutter

The VWO Flutter SDK implements storage through platform-specific mechanisms, such as SharedPreferences for Android and UserDefaults for iOS. This provides a reliable, persistent key-value store that survives app restarts and updates.

Storage Configuration

To enable proper storage functionality in the VWO Flutter SDK, you do not need to provide any external storage parameter during initialization:

Example

import 'package:vwo_fme_flutter_sdk/vwo.dart';
import 'package:vwo_fme_flutter_sdk/vwo/models/vwo_init_options.dart';

final vwoInitOptions = VWOInitOptions(
  sdkKey: 'YOUR_SDK_KEY',
  accountId: YOUR_ACCOUNT_ID,
);

// Initialize the SDK
final vwoClient = await VWO.init(vwoInitOptions);

Important Notes

• Feature flag decisions are stored persistently, ensuring consistent user experiences across app launches.
• The SDK automatically handles caching and retrieval of user decisions without requiring additional configuration.