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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

Preparing an actor for persistence


Before we take a look at Akka persistence, let's review the terminology and architectures used in it:

  • PersistentActor: A stateful actor that persists events to the journal. When a persistent actor is started or restarted, journaled messages are replayed to that actor so that it can recover the internal state from these messages.
  • AsyncWriteJournal: A journal keeps an ordered collection of events that can be sent to a persistent actor. An application can control which messages are journaled and which are received by the persistent actor without being journaled. The data store behind the journal is configurable and needs to be decided depending on the needs. By default, Akka persistence comes with a LevelDB journal plugin (which uses the local filesystem and is not replicated). 
  • AtLeastOnceDelivery: A messaging delivery mechanism that ensures at-least-once delivery semantics to destinations.
  • Snapshot store: A snapshot store persists snapshots of a persistent actor...
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