Actors in Scala - download pdf or read online

By Philipp Haller

ISBN-10: 0981531652

ISBN-13: 9780981531656

Fresh developments in machine structure make concurrency and parallelism an important factor of effective software execution. The actor version of concurrency enables you to exhibit real-world concurrency in a ordinary method utilizing concurrent tactics that converse through asynchronous messages. Scala is a programming language for the Java digital computing device, delivering first-class aid for either object-oriented and useful programming. through together with a robust actor framework in its average library, Scala deals a compelling method of take on concurrent programming. Scala's actors allow you to observe the actor concurrency version to the JVM, allowing real-world suggestions which are effective, scalable, and strong. released via Artima, this can be the 1st booklet on Scala's actors, co-authored through the author and lead maintainer, Philipp Haller, and Frank Sommers. beginning with the basics of the actor concurrency version, this ebook deals a finished instructional on useful programming with actors in Scala. It helps you to leverage the complete energy of present day and tomorrow's multi-core processors by means of describing either simple and complex good points of Scala's actor framework in-depth.

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Extra resources for Actors in Scala

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Of course, merely adding two numbers together is of little use if the result is not visible outside the actor performing the evaluation. Thus, a more useful actor message would contain the address of another actor interested in receiving the result. 3. 3 · The simplest actor computation: adding x and y together. 4 · Actor computation with continuation message passing. ation. Upon evaluating a message according to an internal script, an actor can send the results of that evaluation to its continuation.

Although A activates C’s message, there may be some delay between A sending the message and C receiving a message. The delay may be due to some processing time incurred at B as well as to communication latency. Considering message delay as an integral part of a computation is another way actor communication differs from simple object invocation in object-oriented programming. Practical actor-based systems deal with message delay by offering the ability to asynchronously pass messages between actors.

When replies are expected, those will also be sent asynchronously. 6 AJAX is based on asynchronous messages exchanged between a web browser and a remote server. AJAX has proven practical in web applications because an unknown amount of latency may be incurred both in the network communication as well as in the server processing an incoming message. A web client can simply send a message to the server, register a listener for future replies from the server, and immediately return control to the user interface, keeping the application responsive to user interaction.

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Actors in Scala by Philipp Haller

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