By Manuel Bernhardt
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Additional info for Reactive Web Applications: Covers Play, Akka, and Reactive Streams
Sample text
LANGUAGE DESIGN AND IMMUTABLE STATE Languages and tools favoring the use of immutable state make it easier to develop web applications that have to deal with concurrent access. The Scala programming language is designed to use immutable values by default, rather than mutable variables. Although it’s possible to write programs in an immutable fashion in Java, a lot more boilerplate is involved than in Scala. For example, declaring an immutable value in Scala is done like this: val theAnswer = 42 The same result would be achieved in Java by explicitly prepending the final keyword: final int theAnswer = 42 This may seem like a minor difference, but over the course of writing a large application, it means that the final keyword needs to be used many, many times.
But writing asynchronous applications doesn’t need to be that hard. Callbacks, for all of their merits, are an abstraction that’s too low-level to write complex asynchronous flows. JavaScript is only slowly catching up on tools and abstractions enabling a more human approach to asynchronous programming, but languages such as Scala have been designed with these abstractions in mind, leveraging well-known functional programming principles that make it possible to approach the problem from a different angle.
Unfortunately, web applications are often developed without considering what happens to the application after the code has been shipped and deployed on the production server. This Rethinking computational resource utilization 15 can lead to profound limitations, such as when it comes to running the application on more than just one computer. If the application wasn’t designed for this operational mode from the start, chances are that it won’t be practicable to run it this way without significant changes to the code.