Adobe Analytics

import 'package:contentsquare/contentsquare.dart';
import 'package:flutter_aepedge/flutter_aepedge.dart';
// ... others imports


// TODO: Use your local storage. A package you can use is: https://pub.dev/packages/shared_preferences
final localStorage = LocalStorageFake();

@override
void initState() {
  // ... your code
  sendCSMatchingKeyIfNeeded();
  // ... your code
}

Future<void> sendCSMatchingKeyIfNeeded() async {
  // TODO: Implement your local storage. A package you can use is: https://pub.dev/packages/shared_preferences
  final csMatchingKeyTimestampMap = await localStorage.getMap(
    'csMatchingKey_creation_ts',
  );

  final csMatchingKeyIsNotGenerated = csMatchingKeyTimestampMap == null;
  if (csMatchingKeyIsNotGenerated) {
    await _submitNewCsMatchingKey();
    return;
  }

  final timestamp = DateTime.fromMillisecondsSinceEpoch(
    csMatchingKeyTimestampMap['timestamp'],
  );
  if (DateTime.now().difference(timestamp).inMinutes > 30) {
    // if the key is not valid anymore, submit a new one
    await _submitNewCsMatchingKey();
  }
  // if the key is still valid, do nothing
}

Future<void> _submitNewCsMatchingKey() async {
  // Generate the matching key and store it in the local storage
  final millisecondsSinceEpoch = DateTime.now().millisecondsSinceEpoch;
  final csMatchingKeyValue = '${Random().nextDouble()}_$millisecondsSinceEpoch';

  await localStorage.setMap('csMatchingKey_creation_ts', {
    'csMatchingKey': csMatchingKeyValue,
    'timestamp': millisecondsSinceEpoch,
  });

  // Submit the matching key to Adobe
  final experienceEvent = ExperienceEvent({
    'xdmData': {'eventType': 'csMatchingKey_state'},
    'data': {'csMatchingKey': csMatchingKeyValue}
  });
  await Edge.sendEvent(experienceEvent);

  // Submit the matching key to Contentsquare
  await Contentsquare().sendDynamicVar(
    'csMatchingKey',
    stringValue: csMatchingKeyValue,
  );
}