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Learning Concurrent Programming in Scala

You're reading from   Learning Concurrent Programming in Scala Dive into the Scala framework with this programming guide, created to help you learn Scala and to build intricate, modern, scalable concurrent applications

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Product type Paperback
Published in Nov 2014
Publisher Packt
ISBN-13 9781783281411
Length 366 pages
Edition 1st Edition
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Author (1):
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Aleksandar Prokopec Aleksandar Prokopec
Author Profile Icon Aleksandar Prokopec
Aleksandar Prokopec
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Table of Contents (11) Chapters Close

Preface 1. Introduction 2. Concurrency on the JVM and the Java Memory Model FREE CHAPTER 3. Traditional Building Blocks of Concurrency 4. Asynchronous Programming with Futures and Promises 5. Data-Parallel Collections 6. Concurrent Programming with Reactive Extensions 7. Software Transactional Memory 8. Actors 9. Concurrency in Practice Index

Remote actors


So far in this book, we have mostly concentrated on writing programs on a single computer. Concurrent programs are executed within a single process on one computer, and they communicate using shared memory. Seemingly, actors described in this chapter communicate by passing messages. However, the message passing used throughout this chapter is implemented by reading and writing to shared memory under the hood.

In this section, we study how the actor model ensures location transparency by taking existing actors and deploying them in a distributed program. We take two existing actor implementations, namely, Pingy and Pongy, and deploy them inside different processes. We will then instruct Pingy to send a message to Pongy, as before, and wait until Pingy returns the Pongy actor's message. The message exchange will occur transparently, although Pingy and Pongy were previously implemented without knowing that they might exist inside separate processes, or even different computers...

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