Reactive programming is not a new concept but it’s gaining more and more popularity in the last couple of years, especially with frameworks and libraries such as Vertx, RxJava, Akka,Reactor etc. Even the WebFlux of Spring Boot is becoming the new standard on building RESTfull API’s with reactive streams in mind.
What is Akka in react?
Akka is the implementation of the Actor Model on the JVM. Actors and Streams let you build systems that scale up, using the resources of a server more efficiently, and out, using multiple servers. Building on the principles of The Reactive Manifesto Akka allows you to write systems that self-heal and stay responsive in the face of failures.
What is Akka used for?
Akka is a toolkit for building highly concurrent, distributed, and resilient message-driven applications for Java and Scala. Why Akka? Simpler Concurrent & Distributed Systems Actors and Streams let you build systems that scale up, using the resources of a server more efficiently, and scale out, using multiple servers.
How do I create an Akka project?
To create a new Akka application, use your favorite IDE and build tool to create a new empty project. Akka is provided as regular jar files available through Maven central, so you can use it by just adding the following dependency to your project (after taking a look at akka.io to see which is the latest stable version).
What is Lightbend Akka?
Lightbend is the company behind Akka, used by development teams to build the most demanding, globally distributed, cloud native application environments and streaming data pipelines. Global 2000 enterprises turn to Lightbend products like Akka Serverless and Akka Platform to support their most business-critical initiatives.
Is Akka asynchronous?
Akka actors are asynchronous from the beginning. Reactive programs can be implemented in either way, synchronous and asynchronous.
What is Akka programming?
Akka is a source-available toolkit and runtime simplifying the construction of concurrent and distributed applications on the JVM. Akka supports multiple programming models for concurrency, but it emphasizes actor-based concurrency, with inspiration drawn from Erlang.
Is Akka event-driven?
Akka is an open source, event-driven middleware project. It is designed to allow developers to write simpler, correct concurrent applications using Actors, STM and transactors.
Is Akka Java or Scala?
ScalaAkka is written in Scala, with language bindings provided for both Scala and Java. Akka's approach to handling concurrency is based on the Actor Model.
Is Akka only for Scala?
Akka is a toolkit and runtime for building highly concurrent, distributed, and fault-tolerant event-driven applications on the JVM. Akka can be used with both Java and Scala.
Why Akka is used?
Akka makes it possible to build software systems with reliability and high performance, without sacrificing developer joy and productivity. In short, Akka is open source middleware for building highly concurrent, distributed and fault-tolerant systems on the JVM.
Is Akka event sourcing?
The Event Sourcing with Akka 2.6 video is a good starting point for learning Event Sourcing, together with the Microservices with Akka tutorial that illustrates how to implement an Event Sourced CQRS application with Akka Persistence and Akka Projections.
Is Kafka event-driven?
Kafka provides a scalable hybrid approach that incorporates both Processing and Messaging. Another advantage of using Kafka Event Driven Architecture is that, unlike messaging-oriented systems, events published in Kafka are not removed as soon as they are consumed.
What companies use Akka?
Of our 50 case studies and community stories, 39 of them (78%) are using Akka in production–happy clients include Walmart, Hootsuite, Huffington Post, WhitePages, Gilt, and Ticketfly.
What is similar to Akka?
Top Alternatives to AkkaSpring. ... Scala. ... Erlang. ... Kafka. ... Spring Boot. ... Apache Spark. ... Orleans. ... Netty.
How popular is Akka?
Akka powers 400 million users' streaming games and entertainment.
How old is Akka?
Awarded UNESCO World Heritage status in 2001, Akka has more than 750 years of history.
How do I learn Akka?
0:323:28Learning Akka: The Course Overview | packtpub.com - YouTubeYouTubeStart of suggested clipEnd of suggested clipLet's take a closer look at what we will cover in this course. First will be introduced to the actorMoreLet's take a closer look at what we will cover in this course. First will be introduced to the actor model and some important concepts such as concurrency parallelism asynchronous and synchronous.
What is similar to Akka?
Top Alternatives to AkkaSpring. ... Scala. ... Erlang. ... Kafka. ... Spring Boot. ... Apache Spark. ... Orleans. ... Netty.
Is Akka popular?
Akka Actors is a very popular and widely used framework which implements Actors (or for simplicity, lightweight threads) on the JVM.
Does Spark uses Akka?
Spark uses Akka basically for scheduling. All the workers request for a task to master after registering. The master just assigns the task. Here Spark uses Akka for messaging between the workers and masters.
Event-Driven, Scalable, Resilient, and Responsive Java and Scala
Dives into Akka, covering defining and creating actors and messages, actor hierarchies, fault-tolerance and self-healing, and more.
Creating a New Akka Application
To create a new Akka application, use your favorite IDE and build tool to create a new empty project. Akka is provided as regular jar files available through Maven central, so you can use it by just adding the following dependency to your project (after taking a look at akka.io to see which is the latest stable version).
What Is the Actor Model?
The Actor Model was originally invented by Carl Hewitt in 1973 and has seen a recent resurgence in popularity for concurrency. In the Actor Model, an application is broken up into small units of execution called actors. These actors encapsulate the behavior and state of a part of the application.
Defining an Actor
Create the file AkkaBot.java in the source directory and enter the Java code below:
Creating Actors
Now that we have defined the actor, let's create an instance of it. Since we need Akka to manage the actor’s lifecycle, we don’t create it directly just using the “new” operator, but instead ask the ActorSystem to create and manage the actor for us.
Defining Messages
An actor does not have a public API in terms of methods that you can invoke. Instead, its public API is defined through a protocol, the set of messages, that the actor handles. Messages can be of arbitrary type (any subtype of Object).
Tell the Actor (To Do Something)
All communication with actors is done through asynchronous message passing. This is what makes actors reactive. An actor doesn't do anything unless it's been told to do something, and you tell it to do something by sending the message.
simple message passing
after importing the project, we can implement our first actorsystem. its structure is shown below:
pingpong: remote messages
to try remoting in akka, we have decided to play actor ping-pong. the basic actor code is quite simple (simplified version):
aside: typesafe config
we found that typesafe config is noteworthy because it has an easy syntax, it is easy to use the scala/java api and it is akka’s configuration mechanism. typesafe config has a json-like syntax, called hocon, that allows using different data types e.g. numbers, strings, arrays or nested “objects”.
the trading app
finally, we wanted to try a more involved example which needs more domain modeling and a more sophisticated messaging protocol. the example is inspired by the trading application based on the akka trading performance example but we deviated in multiple aspects.
final thoughts
although our three lab days were very productive we barely scratched the surface of what’s possible with akka. as you may have guessed from reading this blog post we struggled with some aspects but that’s a good sign: after all, we only learn something new by struggling first.
What is Akka toolkit?
Akka is a toolkit for building highly concurrent, distributed, and resilient message-driven applications for Java and Scala
What is Akka in JVM?
Akka is the implementation of the Actor Model on the JVM.
About This Book
Use the concepts of reactive programming to build distributed systems running on multiple nodes
Who This Book Is For
If you are a developer who is passionate about building fault-tolerant, scalable distributed applications using Scala and Akka, then this book will give you a jump start. You should be familiar with Scala, but no prior knowledge of Akka and reactive programming is required.
In Detail
Today's web-based applications need to scale quickly to tackle the demands of modern users. Reactive programming is the solution developed to ensure the fault tolerant and robust scaling that is essential for professional applications.
