如何重试Dart/Flutter中的Future? [英] How can I retry a Future in Dart/Flutter?

问题描述

我有一个方法可以进行一些异步处理，并希望它重试X次.如何在Dart/Flutter中实现?

I have a method that does some async processing and want it to retry X times. How can I achieve that in Dart/Flutter?

推荐答案

使用此功能:

typedef Future<T> FutureGenerator<T>();
Future<T> retry<T>(int retries, FutureGenerator aFuture) async {
  try {
    return await aFuture();
  } catch (e) {
    if (retries > 1) {
      return retry(retries - 1, aFuture);
    }

    rethrow;
  }
}

并使用它:

main(List<String> arguments) {

  retry(2, doSometing);

}

Future doSometing() async {
  print("Doing something...");
  await Future.delayed(Duration(milliseconds: 500));
  return "Something";
}

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