By Philipp Haller
Contemporary traits in machine structure make concurrency and parallelism a vital component of effective application execution. The actor version of concurrency enables you to convey real-world concurrency in a usual manner utilizing concurrent techniques that converse through asynchronous messages. Scala is a programming language for the Java digital desktop, offering first-class help for either object-oriented and useful programming. by way of together with a strong actor framework in its normal 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 suggestions which are effective, scalable, and strong. released by means of Artima, this is often the 1st e-book on Scala's actors, co-authored by means of the writer and lead maintainer, Philipp Haller, and Frank Sommers. beginning with the basics of the actor concurrency version, this publication deals a complete educational on functional programming with actors in Scala. It permits you to leverage the total energy of modern-day and tomorrow's multi-core processors through describing either simple and complicated gains of Scala's actor framework in-depth.
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When an actor receives a message from another actor, the receiving actor examines, or evaluates, the incoming message. Based on the contents and type of that message, the receiving actor may find the message interesting; otherwise, it simply discards the message. When an actor is interested in an incoming message, it may perform some action in response to that message. The action depends on the actor’s internal script or program, as well as the actor’s current state. The ability to perform actions in response to incoming messages is what makes an object an actor.
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.
For instance, if you inserted a sufficient amount of coins, you would expect the machine to prompt you for the choice of drink. And having made that choice, you expect the machine to dispense your selected drink. Of course, you’ve probably experienced occasions when soda machines did not behave in such a predictable, deterministic way. You may have inserted plenty of coins, but instead of the machine prompting you for your choice, it delivered an unwelcoming “OUT OF ORDER” message. Or you may not have received any message at all—but also did not receive your frosty refreshment, no matter how hard you pounded the machine.
Actors in Scala by Philipp Haller