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Akka Cookbook

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

Product type Paperback

Published in May 2017

Publisher Packt

ISBN-13 9781785288180

Length 414 pages

Edition 1st Edition

Languages

Scala

Tools

Akka

Concepts

Concurrency

Authors (3):

Vivek Mishra

Piyush Mishra

H√©ctor Veiga Ortiz

View More author details

Table of Contents (12) Chapters

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

Handling failure in event sourcing

Failure is a regular thing in computer science. Systems crash. Hardware stops working. There are always some out-of-control variables that we cannot predict. However, we can assume failure will happen eventually and take some actions to deal with it. Akka persistence was designed to help ease the recovery from a failure when your actors need to maintain a state and cannot simply be restarted to start from fresh. In this recipe, we will review what happens to persistent actors when something goes wrong.

Getting ready

There are no prerequisites for this recipe.

How to do it…

The following scenarios can happen when using event sourcing and persistent actors:

Cannot recover events from the journal: When creating a new persistent actor, the journal might not be available. Therefore, your actor cannot check whether it needs to recover its state. At this point, Akka persistence decides that it cannot continue, executes the onRecoveryFailure callback, and stops the...

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Authors (2)

Mishra

Mishra

Charit Mishra is an ICS/SCADA security professional. He works as a security architect for critical infrastructure industry (oil and gas, energy and utility, transport, telecom, and so on) and holds extensive experience in security standards, framework, and technologies, with real hands-on experience in security. He has obtained leading industry certifications, such as OSCP, CEH, CompTIA Security+, and CCNA R&S. Also, he holds a master's degree in computer science. He regularly delivers professional trainings on critical infrastructure security internationally.

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Héctor Veiga Ortiz

Héctor Veiga Ortiz

Hector Veiga Ortiz is a software engineer specializing in real-time data integration. Recently, he has focused his work on different cloud technologies (such as AWS) to develop and run scalable, resilient, and high performing applications that are able to handle high volume, real-time data in diverse protocols and formats. To accomplish this task, he has been focusing his work on messaging systems such as Akka. He has also been working on microservice architectures with frameworks such as Lightbends Lagom. Additionally, he has a strong foundation in messaging broker knowledge, such as RabbitMQ and AMQP. Also, Hector has a masters degree in telecommunication engineering from the Universidad Politecnica de Madrid and a masters degree in information technology and management from the Illinois Institute of Technology. He currently works at HERE Technologies as part of the global traffic data integrations team and is actively developing scalable applications to consume data from several different sources. He heavily utilizes Akka to address the scalability and processing requirements. In the past, Hector worked at Xaptum Technologies, a company dedicated to M2M technologies. Moreover, he has also contributed to the Akka project on a couple of occasions and is an active StackOverflow user on the akka tag. Hector has also worked as a technical reviewer on the books RabbitMQ Cookbook and RabbitMQ Essentials by Packt Publishing.

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