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Closes scala#73. async { await(slowCalcFuture) + await(slowCalcFuture) } We get to that block and hit the first await: async { await(slowCalcFuture) + await(slowCalcFuture) ^^^^^ } Ok, so we're asynchronously waiting for that calculation to finish. When it's finished, we 'move on' with analyzing the block: Intro. Scala-async is a library for asynchronous programming.

Scala async await

Update 8/20/2016: The below is no longer true. You can use async and await inside actors now and have been able to since Akka.NET 1.0 (released 4 months or so after this blog post Flow Control in JavaScript is hard! Native Promises in JavaScript have helped immensely, but the syntax is still a little callback-y. With Async + Await, we 2020-12-06 2019-08-29 Scala ; proposal to add async/await to C++ ; and many other less popular languages. This is a huge benefit, as some users already have experience with async/await, and because it makes working with many languages in one project easier (Python with ECMAScript 7 for instance). 2021-03-23 Illegal use of await in the Scala async (in order to keep its transformation lightweight): Within closures.

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async.future onSuccess { // do action. }; }; Another way is to Await the result.

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Furthermore, unlike in C# 5.0 in which a method must be marked as async, in Scala-async, a block of code is surrounded by an async "call". The scala-async library is powered by macros and will translate your code to something equivalent to flatMap and map calls. So in other words await does not block threads, even though it gives the illusion that it does. This looks great actually, unfortunately it has many limitations.

19 Feb 2021 Asynchronous or non-blocking programming is the new reality. When creating server-side, desktop or mobile applications, it's important to 7 Nov 2015 This will block until the task ends in the same way Await.result works.

It was first added in C# and F# and then ported to other languages like Scala, Python, Javascript etc. scala async/await on android. GitHub Gist: instantly share code, notes, and snippets. 2016-02-15 In the meantime the demos have been brought up to date.
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By default, async blocks operate on scala.concurrent.{Future, Promise}. Update: as pointed out by Darren and Yann in comments, you can also do async/await in Scala thanks to this library. There is also a pending proposal to add it to the language that admits that it’s inspired by C#’s asyns/await syntax. Scala官方还提供了一个Async库，用来简化Scala异步操作，尽管这个库还没有正式加入到Scala的标准库中。它是通过Scala macro 特性实现的。 async 用来标记一块异步执行的代码，通常这块代码中包含包含一个或者多个 await 调用。 await () on already-completed future could return value synchronously. #73.