将Try转换为Future，然后将withWithWith转换为Future [英] Convert Try to Future and recoverWith as Future

问题描述

我有一个 Try 引发异常.我希望 Try 成为 Future ，这样我就可以 recoverWith .

I have a Try that throws Exception. I want that Try to become a Future so I will be able to recoverWith.

如何在不处理 Try 中的任何异常的情况下将 Try 转换为 Future (正好在将来具有恢复功能)?

How can I convert the Try into a Future without handling any exceptions in the Try (just in the Future with recover)?

请注意，需要Await来测试未来的结果

该代码示例演示了我的想法，但是一旦达到，它也会引发( new RuntimeException("------- failed -------")是我得到了什么

The code sample demonstrates what I had in mind but it also throws once reached (new RuntimeException("-------failed-------") is what I get)

val t = Try(throw new RuntimeException("my"))

val resF : Future[String] = if (t.isSuccess)
  Future.successful(t.get)
else
  Future.failed(new RuntimeException("-------failed-------"))

val resFWithRecover = resF.recoverWith{
  case NonFatal(e) =>
    Future.successful("recoveredWith")
}
Await.result(resFWithRecover, Duration("5s"))

推荐答案

...如何将 Try 转换为 Future ，而不在 Try 中处理任何异常?

... how do convert Try to Future without handling any exception in the Try?

使用 Future.fromTry .

scala> val t = Try(throw new RuntimeException("my"))
t: scala.util.Try[Nothing] = Failure(java.lang.RuntimeException: my)

scala> val resF = Future.fromTry(t)
resF: scala.concurrent.Future[Nothing] = scala.concurrent.impl.Promise$KeptPromise@57cf54e1

scala> resF.recoverWith{
     |   case NonFatal(e) =>
     |     Future.successful("recoveredWith")
     | }
res5: scala.concurrent.Future[String] = scala.concurrent.impl.Promise$DefaultPromise@1b75c2e3

这篇关于将Try转换为Future，然后将withWithWith转换为Future的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！