By Philipp Haller
Contemporary developments in desktop structure make concurrency and parallelism a vital aspect of effective application execution. The actor version of concurrency lets you exhibit real-world concurrency in a average manner utilizing concurrent methods that converse through asynchronous messages.
Scala is a programming language for the Java digital computer, offering very good aid for either object-oriented and practical programming. by way of together with a robust actor framework in its ordinary 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, permitting real-world options which are effective, scalable, and strong.
Published 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 e-book bargains a accomplished educational on functional programming with actors in Scala. It allows you to leverage the complete strength of latest and tomorrow's multi-core processors by means of describing either uncomplicated and complicated good points of Scala's actor framework in-depth.
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Additional resources for Actors in Scala
After building the chain using ❜✉✐❧❞❈❤❛✐♥, we immediately send a ✬❉✐❡ message to the first actor in the chain. What happens is that each actor sends ✬❉✐❡ to the next actor, waiting for an ✬❆❝❦ message. When the ✬❆❝❦ is received, the actor propagates it to the previous actor and terminates; the first actor is the last one to receive its ✬✬✬ ❆❆❆❝❝❝❦❦❦ . When the r❡❝❡✐✈❡ operation in the ♠❛✐♥ method starts processing , all actors in the chain have terminated. 2 · The ♠❛✐♥ method. How many actors are too many?
You can also build custom control-flow combinators that allow you to use r❡❛❝t inside for-comprehensions. In the following section we explain how this can be done. 9: A custom ❋♦r❊❛❝❤ operator enables r❡❛❝t in forcomprehensions. 10 · Implementing the custom ❋♦r❊❛❝❤ operator. 3 Chapter 5 · Event-Based Programming Building custom control-flow operators Sometimes the existing control-flow combinators provided by the ❆❝t♦r object are not well-suited for the task at hand. In such cases building custom control-flow operators can help.
The ❋♦r❊❛❝❤ class has a single method ❢♦r❡❛❝❤ that takes a parameter of function type ❚ ❂❃ ❯♥✐t. 9. The variable that is bound to the generated elements in the for-comprehension corresponds to the parameter of the function ❢✉♥. The body of the for-comprehension corresponds to the body of ❢✉♥. Inside ❢♦r❡❛❝❤ we first obtain an iterator ✐t from the ■t❡r❛❜❧❡.
Actors in Scala by Philipp Haller