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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

Using persistence query

Akka persistence query is a helper module in the Akka persistence ecosystem that gives visibility into the journal events. Akka persistence query provides means to run asynchronous queries against the journal by using Akka Streams. Akka persistence query defines a set of predefined queries to analyze the log of events. Akka persistence query has a very loose API on purpose, so it is common to find different journal plugins with slightly different implementations. In this recipe, we will review the different predefined queries and see what each query is used for.

Getting ready

This recipe does not have any prerequisites. However before going through this recipe, it is required to understand what event adapters are in the Akka persistence context. Event adapters help to detach the data model from the domain model completely. This might be helpful in scenario where your data model evolves over time or you want to use a different format when storing the events in the journal...

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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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