Difference Await.ready and Await.result

I know this is quite an open ended question and I apologize.

I can see that Await.ready returns Awaitable.type while Await.result returns T but I still confuse them.

What are the difference between the two?

Is one blocking and the other one non-blocking?

They both block until the future completes, the difference is just their return type.

The difference is useful when your Future throws exceptions:

def a = Future { Thread.sleep(2000); 100 }
def b = Future { Thread.sleep(2000); throw new NullPointerException }

Await.ready(a, Duration.Inf) // Success(100)
Await.ready(b, Duration.Inf) // Failure(java.lang.NullPointerException)

Await.result(a, Duration.Inf) // 100
Await.result(b, Duration.Inf) // crash with java.lang.NullPointerException

Difference Await.ready and Await.result - scala - html, def ready[T](awaitable: Awaitable[T], atMost: Duration): Awaitable[T]. Await the " completed" state of an Awaitable . 33 Difference Await.ready and Await.result; 4 Maximise difference between mean and median Feb 14 '16. 3 Why non-trivial solution only if determinant is zero May

Both are blocking for at most the given Duration. However, Await.result tries to return the future result right away and throws an exception if the future failed while Await.ready returns the completed future from which the result (Success or Failure) can safely be extracted via the value property.

The latter is very handy when you have to deal with a timeout as well:

val future = Future { Thread.sleep(Random.nextInt(2000)); 123 }

Try(Await.ready(future, 1.second)) match {
    case Success(f) => f.value.get match {
      case Success(res) => // handle future success 
      case Failure(e) => // handle future failure
    }
    case Failure(_) => // handle timeout
}

When using Await.result, the timeout exception and exceptions from failing futures are "mixed up".

Try(Await.result(future, 1.second)) match {
    case Success(res) => // we can deal with the result directly
    case Failure(e) => // but we might have to figure out if a timeout happened
}

scala.concurrent.Await, This value is usually the result of some other computation: Registering a foreach callback has the same semantics as onComplete , with the difference that the Alternatively, calling Await.ready waits until the future becomes completed, but� Wait(), will cause to run potentially async code in sync manner. await will not. For example, you have an asp.net web application. UserA calls /getUser/1 endpoint. asp.net app pool will pick a thread from thread pool (Thread1) and, this thread will make a http call.

In general, both are blocking.

The difference is that Await.ready is blocking until the Future has finished (successful or failed) in given time.

The only one difference is that ready blocks until the Awaitable is ready and the result does yield the result type T.

Postscriptum: In practice, if you want to perform some actions like error checking or logging you would take Await.ready(...) if you want to compose the result and throw an error if something goes wrong take Await.result(...).

As rule of thumb - try to avoid Await.

Futures and Promises, Await and return the result (of type T ) of an Awaitable . Looking at the docs alone, it seems to me that `ready`'s difference is that it will "ensure� 33 Difference Await.ready and Await.result; 32 How is the cost function from Logistic Regression derivated; 31 Passing out-of-scope variable with jest.mock;

scala.concurrent.Await#ready versus #await?, Synchronously await the result of some action by blocking the current thread. The two def ready[T <: Awaitable[_]](awaitable: T, timeout: Duration): T. Returns� The following examples show how to use scala.concurrent.Await.These examples are extracted from open source projects. You can vote up the examples you like and your votes will be used in our system to produce more good examples.

Await, withTimeout(Duration(5, "seconds")) val msg: String = Await.result(future, Duration(10, settingDefinitions.foreach { definition => definition shouldBe WorkerApi. json_mapper.reader() val result = Await.ready(nominatim. nominatim("135� Understanding how the co_await operator works can help to demystify the behaviour of coroutines and how they are suspended and resumed. In this post I will be explaining the mechanics of the co_await operator and introduce the related ‘Awaitable’ and ‘Awaiter’ type concepts.

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Comments
  • If I'm not mistaken, Await.ready will not return the Try directly but you have to extract it from the future first via Await.ready(a, d).value.get.