Actors in Scala - download pdf or read online

By Philipp Haller

ISBN-10: 0981531652

ISBN-13: 9780981531656

Contemporary traits in computing device structure make concurrency and parallelism an important factor of effective software execution. The actor version of concurrency lets you exhibit real-world concurrency in a traditional means utilizing concurrent techniques that converse through asynchronous messages. Scala is a programming language for the Java digital computer, supplying very good help for either object-oriented and sensible programming. through together with a strong actor framework in its general library, Scala bargains a compelling method of take on concurrent programming. Scala's actors allow you to follow the actor concurrency version to the JVM, allowing real-world recommendations which are effective, scalable, and powerful. released through Artima, this can be the 1st ebook on Scala's actors, co-authored via the author and lead maintainer, Philipp Haller, and Frank Sommers. beginning with the basics of the actor concurrency version, this publication bargains a entire instructional on sensible programming with actors in Scala. It allows you to leverage the total energy of modern and tomorrow's multi-core processors by means of describing either uncomplicated and complex positive factors of Scala's actor framework in-depth.

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In almost every development team, some developers are more skilled in a language while some have more experience with a problem domain. Scala aims to present complexity at the level most appropriate for a developer. Developers more skilled in the language itself are able to define new, relatively simple language constructs that address the needs of domain experts who may have less Scala experience. Scala’s division-of-labor aspect has been applied to software testing, data analysis, as well as to the area of concurrency and actor programming.

Only the use of synchronizing operations, such as locking via synchronized methods or accessing volatile fields ensures that updates "happen before" subsequent reads, and therefore become visible. You can find an excellent discussion of thread visibility on the JVM in [Goe06]. 2 One of the reasons why scalability is hard to achieve using locks (or Java-style synchronization) is the fact that coarse-grained locking increases the amount of code that is executed sequentially. Moreover, accessing a small number of locks (or, in the extreme case, a single global lock) from several threads may increase the cost of synchronization significantly.

If you wish, however, you can declare a mutable variable via the var keyword. 3 Methods and classes Scala methods start with the def keyword, and do not require the return keyword. Instead, the value of the last expression in the method is returned. 4 Chapter 3 · Scala’s Language Support for Actors Methods that consist of a single expression can alternatively leave out the surrounding braces: def addOne(x: Int) = x + 1 As in Java, Scala methods are part of a class: class Calculator { def addOne(x: Int) = x + 1 } Scala inheritance works in conjunction with existing Java code, too.

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Actors in Scala by Philipp Haller

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