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Akka Cookbook

You're reading from   Akka Cookbook Recipes for concurrent, fast, and reactive applications

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Product type Paperback
Published in May 2017
Publisher Packt
ISBN-13 9781785288180
Length 414 pages
Edition 1st Edition
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Authors (3):
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Vivek Mishra Vivek Mishra
Author Profile Icon Vivek Mishra
Vivek Mishra
Piyush Mishra Piyush Mishra
Author Profile Icon Piyush Mishra
Piyush Mishra
Héctor Veiga Ortiz Héctor Veiga Ortiz
Author Profile Icon Héctor Veiga Ortiz
Héctor Veiga Ortiz
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Toc

Table of Contents (12) Chapters Close

Preface 1. Diving into Akka FREE CHAPTER 2. Supervision and Monitoring 3. Routing Messages 4. Using Futures and Agents 5. Scheduling Actors and Other Utilities 6. Akka Persistence 7. Remoting and Akka Clustering 8. Akka Streams 9. Akka HTTP 10. Understanding Various Akka patterns 11. Microservices with Lagom

How to transform streams and consume them


As mentioned before, a Source is responsible for consuming elements and emitting them through the stream. A Flow is responsible for transforming elements as they go. In this recipe, we will revisit the out-of-the-box transforming functions a Flow provides. In a later recipe, we will see how we can create more complicated Flows using the Graph DSL.

Getting ready

We will use the same prerequisites as that of the previous recipe. This time, we will implement a stream to do a word count. We will consume a GZIP compressed file and count the occurrences of each word.

How to do it...

For this recipe, perform the following steps:

  1. Create a test file named gzipped-file inside src/main/resources with the following contents:
        hello world from akka streams! No seriously,
        HELLO WORLD FROM AKKA STREAMS!!!
  1. Then compress the file. This can be easily achieved using the gzip gzipped-file command. You should end up with a compressed file named gzipped-file.gz...
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