Essential Properties of Modern Applications – Asynchrony and Concurrency

The Async library – SIP-22-Async

In Chapter 7, Working with Integration and Web Services, we have briefly seen how to call asynchronous web services that return a Future object. The aim of Async is to simplify asynchronous code by providing a couple of powerful constructs to deal with asynchronous code blocks and, in particular, combining several such blocks. It consists of only two constructs:

async { <expression> }: In this construct, <expression> is the code to be executed asynchronously.
await { <expression returning a Future> }: This construct is included in an async block. It suspends the execution of the enclosing async block until the argument Future is completed.

An interesting characteristic of the whole async/await mechanism is that it is totally nonblocking. Although it is not really required to understand how async/await works, the exact signature of the two methods async[] and await[] are given for reference, as follows:

def async[T](body: => T) : Future...

Tech Concepts

Programming languages

Tech Tools

Unlimited access to the largest independent learning library in tech of over 8,000 expert-authored tech books and videos.

Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.

50+ new titles added per month and exclusive early access to books as they are being written.

Scala for Java Developers

By : Thomas Alexandre

Scala for Java Developers

By: Thomas Alexandre

Overview of this book

The Async library – SIP-22-Async

Scala for Java Developers

By : Thomas Alexandre

Scala for Java Developers

By: Thomas Alexandre

Overview of this book

The Async library – SIP-22-Async

Confirmation

Buy this book with your credits?

Submit Your Feedback

Create a Free Account To Continue Reading

Sign in to activate your 7-day free access