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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

Creating a singleton actor across clusters

In some scenarios, it is required for you to have a singleton object within your whole cluster. The Akka Cluster Singleton module provides means to accomplish this task in an easy way.

This module picks the oldest node in the cluster to create your singleton actor. If this node gets removed from the cluster, then the module uses the same logic to decide where to deploy your singleton actor. First, it selects the oldest node in the cluster to recreate your singleton actor. Second, the module ensures that there is only one instance of your actor running within the whole cluster.

To demonstrate this behavior, we will make use of Auto Downing. This feature of Akka Cluster automatically marks a node Down and removes it from the cluster after a configurable amount of time. This feature is off by default.

Getting ready

For this recipe, we will set up a cluster of two nodes running on the same machine. For this, we will use two different ports specified in...

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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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