Simple scala akka actor examples hello, world examples. You can join these groups and chats to discuss and ask akka related questions. Welcome to the first tutorial on how to get started with akka and scala. Our akka tutorial is designed for beginners and professionals. To build and run the tutorial sample from the command line, you have to download akka. If i create a simple hello world scala app that just does a println for example, it builds and i can right click and run scala application with no issue. However, there are two essential concepts you need to understand in order to get started.
After sbt downloads the akka jar files and their dependencies, you should see the following output from the println statements in the. In this tutorial, we will integrate this into scala programming language. Akka tutorial akka tutorial provides basic and advanced concepts of akka. For the purpose of this akka tutorial, we will be using the latest version which is currently 2.
Akkas approach to handling concurrency is based on the actor model. We assume that you already know what akka and scala are and will now focus on the steps necessary to start your first project. Register now and you will be ready to start deploying the akka toolkit in your production systems, scaling to. How to get started with a simple scalaakka actor hello, world. Akka has both a scala api actors scala and a java api actors java. First, make sure you have the java 8 jdk or java 11 jdk installed. In the config directory we have the akka conf files in the doc directory we have the documentation, api, doc jars, and also the source files for the tutorials in the lib directory we have the scala and akka jars in the src directory we have the source jars for akka the only jar we will need for this tutorial apart from the scala library. Most of the scala akka actor tutorials i see jump right into the deep end. Props class boardactor extends actor with actorlogging var users setactorref def receive loggingreceive case m. For faulttolerance it adopts the let it crash model, which has been used with great success in the telecoms industry to build applications that selfheal systems that never stop. This project provides an implementation of akka s core akka actor module for scala. Akka is a toolkit and runtime for building highly concurrent, distributed, and faulttolerant eventdriven applications on the jvm. Building a fully functional rest service using akka actors. The best way to start learning akka is to download lightbend activator and.
This tutorial extends the previous tutorial simple akka tutorial in scala step by step for the java developers, and simple akka tutorial in java with 2 actors step 1. Data is increasingly being modeled as streams, and as a result, more frameworks and libraries are providing capabilities to manage data as such. This will take you through how to use the typesafe templates to get an akka project set up just like you were used to in the coursera class. I havent had the opportunity to work with akka much since finishing the scala cookbook, so i dug around trying to find a simple akka remote hello, world example. It is used to create concurrent, distributed and faulttolerant application. First of all, you need to have java software development kit. Anychart scala akka mysql integration sample includes two parts. In the scala standard library, you basically implement the run method and if you want to wait for an incoming message, you get yourself into a waiting state by calling receive or react.
An important goal is to minimize source differences between upstream akka actor and akka actorjs. Thanks so much for this, i cant believe what torture it is to get akka and scala working together on eclipse. This project provides an implementation of akkas core akkaactor module for scala. The article assumes some basic scala knowledge, but even if you dont know scala i dont think it will not be too hard to follow along anyway. This is a selfcontained jar with zero dependencies and contains everything we need to write a system using actors. Akka uses the actor model to raise the abstraction level and provide a better platform to build correct concurrent and scalable applications. The scala actor model, more specifically, akka, can help. Building scala project in eclipse with akka stack overflow. The actor model is a design pattern for writing concurrent and scalable code. Im new to scala and akka and i was just trying to do one of the sample tutorial projects in eclipse luna with scala ide 4.
I was surprised when there wasnt a similar tutorial for akka actors, so i took a little time to write my own. It then shows the construction of a simple program with a single actor that we send. Scala is the functional and objectoriented programming language created by lightbend cofounder, prof. Without any surprises, our akka code snippets below will be making use of scala. Getting started with akka 2 remarks 2 examples 2 installation or setup 2 chapter 2. Scala can be installed on any unix flavored or windows based system. The sample application that we will create is using actors to calculate the value of pi. Akka tutorial provides basic and advanced concepts of akka. Scala is a modern multiparadigm programming language designed to express common programming patterns in a concise, elegant, and typesafe way. The only jar we will need for this tutorial apart from the scala library. A model for concurrency and distribution without all the pain of threading primitives.
An important goal is to minimize source differences between upstream akkaactor and akkaactorjs. Whats the difference of the akkas actor with scalas actor. Erlang and parts of akka are both designed to help ease programming when its already known that the actor model is the more appropriate construct to implement concurrency. Akka is written in scala, with language bindings provided for both scala and java. In the scala standard library, you basically implement the run method and if you want to wait for an incoming message, you get yourself into a.
The simplest way to get started with akka and maven is to check out the lightbend activator tutorial named akka main in java. Net is a very large framework and takes a bit of time to master. Scala has been created by martin odersky and he released the first version in 2003. You can integrate this library into any jvm java virtual machine support language. The only jar we will need for this tutorial apart from the scalalibrary. Actor dsl 4 examples 4 simple actor dsl 4 context switching 4 lifecycle management 4 nested actors 5 supervision 5 stash support 5 chapter 3. Akka has the concept of actors, which provide an ideal model for thinking about highly concurrent and scalable systems. For programming model, there is a big difference between the scala standard library and akka. Jan 04, 2016 data is increasingly being modeled as streams, and as a result, more frameworks and libraries are providing capabilities to manage data as such.
Refer jdk compatibility for scala java compatiblity detail. Akka is an open source project built by lightbend, it provides a simpler, single programming model one way of coding for concurrent and distributed applications the actor programming model. Scala smoothly integrates the features of objectoriented and functional languages. This video gives a brief description of a problem that you might consider tackling with actors to help you see how you could think about your own problem solving in terms of actor systems. Akka brings similar features around concurrency and parallelism onto the jvm, and you can use either java or scala with the akka libraries.
Before you start installing scala on your machine, you must have java 1. While doing some crazy things with sarah, i realized that the best way to solve a particular problem was to use remote akka actors. Akka with scala training classes akka with scala course. The akkaactorjs project contains the core actor implementation. In this article we will only look at the scala api since that is the most expressive one. Akka is a free and opensource toolkit and runtime simplifying the construction of concurrent and distributed applications on the jvm. This example is described in the akka quickstart with scala guide. You will use this as a seed project and add the functionality described in this tutorial. Anychart scalaakkamysql integration sample includes two parts. If you dont have it installed, download java from oracle java 8, oracle java 11, or adoptopenjdk 811. The akka actorjs project contains the core actor implementation.
Akka is a opensource library or a toolkit written in scala to create concurrent, distributed and faulttolerant application. Maven would have been nice, but it does a terrible thing with scala. Download the project as a compressed file from lightbend tech hub by. This guide introduces akka by describing the scala version of the hello world example. We will be using eclipse, and the scala plugin for eclipse. Scala allows developers write code thats more concise, less costly to maintain, and easier to evolve, and is the language used to build popular distributed computing, big data and streaming technologies like apache spark, apache kafka, and the akka platform. After sbt downloads all the dependencies it needs, you should see.
Akka is a javascala implementation of the actor model. Getting started with scala and sbt on the command line. In an actorbased system, everything is an actor, in much the same way that everything is an object in objectoriented design. The project structure mirrors that of upstream akka. An intuitive and safe way to do asynchronous, nonblocking backpressured stream processing. Akka is the implementation of the actor model on the jvm.
Participants will get a refresher on scala and by the end of this scala akka course you will be able to use akka and scala features to build robust and concurrent applications. Follow the instructions for setting up scala, sbt, giter8 etc. Jun 03, 2018 akka is an open source project built by lightbend, it provides a simpler, single programming model one way of coding for concurrent and distributed applications the actor programming model. If you are new to akka, we recommend completing the akka quickstart guide before this tutorial. Testing scala with sbt and scalatest on the command line. The hello world example for scala is a zipped project that includes a distribution of sbt.
Within 30 minutes, you should be able to download and run the example and use this guide to understand how the example is constructed. Refer jdk compatibility for scalajava compatiblity detail. If you prefer to use sbt to build and run the sample. Actors and streams let you build systems that scale up, using the resources of a server more efficiently. Akka supports multiple programming models for concurrency, but it emphasizes actorbased concurrency, with inspiration drawn from erlang. Feb 14, 2016 this video gives a brief description of a problem that you might consider tackling with actors to help you see how you could think about your own problem solving in terms of actor systems.
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