async_lite 1.0.0

async_lite: ^1.0.0 copied to clipboard

example/main.dart

// ignore_for_file: avoid_print

import 'package:async_lite/async_lite.dart';

void main() async {
  // Example 1: Using LazyFutureExt to cache async calls
  print('--- LazyFutureExt Example ---');
  // Multiple parallel calls return the same cached result
  final futures = List.generate(5, (i) => fetchData.byLazy());
  final results = await Future.wait(futures);
  for (var i = 0; i < results.length; i++) {
    print('Call $i: ${results[i]}');
  }

  // Example 2: Using Result type
  print('\n--- Result Example ---');
  final success = await handleOperation(true);
  print(success);

  final failure = await handleOperation(false);
  print(failure);

  // Example 3: Using AsyncCache
  print('\n--- AsyncCache Example ---');
  final cache = AsyncCache<String>(const Duration(seconds: 2));
  final cached1 = await cache.fetch(expensiveOperation);
  print('First: $cached1');
  final cached2 = await cache.fetch(expensiveOperation);
  print('Second (cached): $cached2');

  // Example 4: UI State from Result
  print('\n--- UI State Example ---');
  final successState = (await handleOperation(true)).toUiState();
  handleUiState(successState);

  final errorState = (await handleOperation(false)).toUiState();
  handleUiState(errorState);
}

Future<String> fetchData() async {
  await Future.delayed(const Duration(milliseconds: 500));
  return 'Data loaded at ${DateTime.now()}';
}

Future<Result<String>> handleOperation(bool success) async {
  if (success) {
    return const ValueResult('Operation completed');
  }
  return const ErrorResult('Operation failed');
}

Future<String> expensiveOperation() async {
  await Future.delayed(const Duration(seconds: 1));
  return 'Expensive result: ${DateTime.now()}';
}

void handleUiState<T>(BaseUiState<T> state) {
  switch (state.type) {
    case UiState.loading:
      print('Loading...');
    case UiState.value:
      print('Success: ${state.valueOrNull}');
    case UiState.error:
      print('Error: ${state.messageOrNull}');
  }
}