Download e-book for iPad: Actors in Scala by Philipp Haller

By Philipp Haller

ISBN-10: 0981531652

ISBN-13: 9780981531656

Fresh traits in computing device structure make concurrency and parallelism a necessary component of effective application execution. The actor version of concurrency lets you convey real-world concurrency in a typical manner utilizing concurrent methods that converse through asynchronous messages. Scala is a programming language for the Java digital computer, supplying very good aid for either object-oriented and useful programming. by means of 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 practice the actor concurrency version to the JVM, allowing real-world strategies which are effective, scalable, and strong. released by way of Artima, this is often the 1st booklet on Scala's actors, co-authored by way of the author and lead maintainer, Philipp Haller, and Frank Sommers. beginning with the basics of the actor concurrency version, this publication deals a entire educational on sensible programming with actors in Scala. It permits you to leverage the complete energy of trendy and tomorrow's multi-core processors by way of describing either simple and complex good points of Scala's actor framework in-depth.

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Although we are generally adept at dealing with such indeterminism in physical objects—as well as when dealing with people—when we encounter such indeterminism in software, we tend to consider that behavior a bug. Examining such “bugs” may reveal that they crept into our code because some aspect of our program was not sufficiently specified. Naturally, as developers, we desire to create programs that are wellspecified and, therefore, behave as expected—programs that act exactly in accord with detailed and exhaustive specifications.

In the actor model, unboundedness and indeterminism—or, unbounded indeterminism—are key attributes of concurrent computing. Although these characteristics are also present in primarily sequential systems, they are pervasive in concurrent programs. Acknowledging these attributes of concurrency and providing a model that allows a developer to reason about concurrent programs in the face of those attributes are the prime goals of actors. 33 Chapter 2 Messages All the Way Up Actor-based programming aims to model the complex world of pervasive concurrency with a handful of simple abstractions.

If that reply order is left unspecified, then core 1 can start processing a reply as soon as it receives one; it does not have to wait for the slowest core to finish its work. In this example, leaving the reply order from cores 2, 3, and 4 unspecified helps to best utilize the available computing resources. At the same time, your program can no longer rely on any specific message ordering. Instead, your application must function deterministically even though its component computations, or how those components interact, may not be fully specified.

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Actors in Scala by Philipp Haller


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