how get the result of Future without using “await”

Question

I want to get the result of a Future without blocking operations. If I write my code with "await", it works but it is not good for me because it is blocking:

val t: Future[MatchResult[Personne]] = db.getPersonne(userId).map(_.get must beEqualTo(personne))
t.await

I tried to change my code with map:

 val r: Future[MatchResult[Personne]] = db.getPersonne(userId).map(_.get must beEqualTo(personne))
   r.map {
     case r@isWhatIExpected => r
     case isNot => isNot
   }

but I have this error:

found : scala.concurrent.Future[org.specs2.matcher.MatchResult[Personne]]
[error] required: org.specs2.specification.create.InterpolatedFragment

When you are in a Future context, you cannot get out of it without waiting. However, you can use onComplete to consume the result when it is ready. — marstran
Your question seems to be about spec2 not futures in general. In general you can use fut.foreach or fut.map to continue working with the values of a future. — 0__

cchantep cchantep · Accepted Answer · 2017-01-24T09:14:43

Using Specs2 as it appears, there are helpers to test async functions.

import org.specs2.concurrent.{ExecutionEnv => EE}

"Foo" in { implicit ee: EE => // take care of ee
  myAsyncFunWithFuture must beEqualTo(expectedVal).await(timeToWait)
}

how get the result of Future without using “await”

2 Answers