在特定时间等待未来 [英] Await future for a specific time

问题描述

您将如何等待特定时间的未来响应?

How would you wait for future response for a specific amount of time?

比如说，我们发出一个 http post 请求并在我们关闭 http 请求之前等待它的响应，但是，我们只等待 3 秒，否则我们关闭请求.

Say, we make a http post request and await for its response before we close the http request, but, we wait for only 3 secs, else we close the request.

您将如何实现这一目标?

How would you achieve that?

类似的东西

Future makePostReq() async{
  .... 

  await http response for 3 secs

  .... 

 if(response) {
  ... Do something with it
 }

 Http.close

} 

推荐答案

您可以使用 Future.any 构造函数来制造竞争条件

You can use Future.any constructor to make a race condition

final result = await Future.any([
  Future.value(42),
  Future.delayed(const Duration(seconds: 3))
]);

你也可以使用Future.timout 方法

You can also use Future.timout method

final result = await Future.value(42).timeout(const Duration(seconds: 3));

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