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Overview

Storage tracks presentation events across sessions. This guide shows you how to implement the PresentumStorage interface.

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Quick implementation

Use SharedPreferences for simple apps: 
class MyStorage implements PresentumStorage<AppSurface, CampaignVariant> {
  late SharedPreferencesWithCache _prefs;

  @override
  Future<void> init() async {
    _prefs = await SharedPreferencesWithCache.create(
      cacheOptions: const SharedPreferencesWithCacheOptions(),
    );
  }

  @override
  Future<void> recordShown(
    String itemId, {
    required AppSurface surface,
    required CampaignVariant variant,
    required DateTime at,
  }) async {
    final key = '$itemId::${surface.name}::${variant.name}';
    final count = _prefs.getInt('${key}_count') ?? 0;
    await _prefs.setInt('${key}_count', count + 1);
    await _prefs.setString('${key}_last', at.toIso8601String());
  }

  // Implement other methods...
}

See production storage

Complete SharedPreferences implementation