Enhance your akka systems with from the creators of akka, get technology enhancements, monitoring, and expert support with akka platform from lightbend. 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. Anychart scala akka mysql integration sample includes two parts. Indepth documentation covering many of scalas features. Our akka tutorial includes all topics of akka api such as what is actor, actor life cycle, actors communication, props, child actor, actor system etc.
Net in your project, you can install it directly from nuget. A futuret is simply something that will return a t in the future. They are a part of akka open source library, and i think in the future will be a part of the scala standard library as well. Were also planning on updating and extending the material for akka 2. The scala actor model, more specifically, akka, can help. An excellent stepbystep introduction to many of the scala features with the help of simple code examples. For an overview of the cluster support see the java and scala documentation chapters. In this blog post, sidharth khattri explains the process wherein you can stream data directly from postgresql database using scala slick which is scalas database accessquery library and akka streams.
A model for concurrency and distribution without all the pain of threading primitives. A handy cheatsheet covering the basics of scala s syntax. Scala provides socalled persistent datastructures which makes working with immutable collections fast. The project structure mirrors that of upstream akka. A recent addition to akka s future is several monadic methods that are very similar to the ones used by scala s collections. Scala is a pure objectoriented language in the sense that every value is an object.
You want to start an akka actor in a scala application, or attempt to control the start of an actor. This project provides an implementation of akka s core akka actor module for scala. Simple scala akka actor examples hello, world examples. In this case, as described in the documentation, it will set up the. The akkaactorjs project contains the core actor implementation.
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. Scale up concurrency scale out remoting fault tolerance. Plugin documentation and other info, please look at live documents here. Slides pdf 20150318 reactive slick for database programming scaladays, san francisco, ca. Anychart scalaakkamysql integration sample includes two parts. 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. Akka is a opensource library or a toolkit written in scala to create concurrent, distributed and faulttolerant application. Scala by example learn scala through a series of examples.
Akka supports multiple programming models for concurrency, but it emphasizes actorbased concurrency, with inspiration drawn from erlang. Templates listed here are not maintained by the play team, and so may be out of date. Most of the scala akka actor tutorials i see jump right into the deep end, throwing you into some tough concepts right away. Akka is a free and opensource toolkit and runtime simplifying the construction of concurrent and distributed applications on the jvm. The documentation also warns that the ordering guarantee can be violated. The akka actorjs project contains the core actor implementation. This is a grails plugin that enable the usage of akka actors both local and remote in grails web projects.
In this tutorial, well walk you through downloading and setting up intellij with the scala plugin, and well get you started with your first scala project, complete with unit tests. Pay special attention to setting up the scala ide for eclipse optional. For additional information, you can refer to the official akka documentation on akka clustering. An indepth guide on how to write idiomatic scala code. The api of akkas actors is similar to scala actors which has borrowed some of its syntax from erlang.
In an sbt project, youve marked up your scala source code with scaladoc comments, and want to generate the api documentation for your project. This guide introduces akka by describing the scala version of the hello world example. A handy cheatsheet covering the basics of scalas syntax. The artima book actors in scala also covers the basics of akka, plus remoting. The play community also has a number of tutorials and templates that cover aspects of play than the documentation can, or has a different angle.
Since akka is published to maven central for versions since 2. Jun 04, 2017 any plans to releasepublish the epub or pdf version of akka 2. Documentation faq download mailing list code commercial support message delivery reliability. An important goal is to minimize source differences between upstream akkaactor and akkaactorjs. This project provides an implementation of akkas core akkaactor module for scala. Scala is a modern multiparadigm programming language designed to express common programming patterns in a concise, elegant, and typesafe way. It seamlessly integrates features of objectoriented and functional languages. In this case, as described in the documentation, it will set up the actorsystem instance and other necessary infrastructure. Below is a code snippet of the library dependencies in your build. Do they need to be downloaded and installed separately, even though the scala ide plugin installed the rest of scala 2. In general, actors give you the benefit of offering a high level of abstraction for achieving concurrency and parallelism.
These allow you to create pipelines or streams that the result will travel through. An important goal is to minimize source differences between upstream akka actor and akka actorjs. All you need to run a future, is to have an implicit executioncontext, which you can derive from a java executor service. Intellij is the most commonlyused ide by scala developers. Software transactional memory scala akka documentation. The stm is based on transactional references referred to as refs. Type activator new in cmdterminal you can choose 4 because hello world example is based on scala import the project to your favorite ide and start with the hello world example. The timings are approximated and are still limited by the ceiling of the operating systems clock resolution.
More information is available in the documentation of the microkernel scala microkernel java. Indepth documentation covering many of scala s features. Akka is a toolkit and runtime for building highly concurrent, distributed, and faulttolerant eventdriven applications on the jvm. Handson akka actor programming hassoplattnerinstitut. Akka is the implementation of the actor model on the jvm. Before learning akka, you must have the basic knowledge of scala. 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 purpose of this document is to guide users through the migration process and explain how to use the amk. Follow the instructions for setting up scala, sbt, giter8 etc. Scala reference manuals the scala programming language. Personally im more into the crawl before you walk approach, and to that end, here are some simple akka actor examples, of hello, world variety. When i look at my scala projects properties, i indeed do not see any of the akka jar files that are mentioned in the akka documentation. This talk describes the techniques used for the hlist implementation in slick. Play is based on a lightweight, stateless, webfriendly architecture and features predictable and minimal resource consumption cpu, memory, threads for highly.
A list of frequentlyasked questions about scala language features and their answers. Main is not an argument, it is the launcher class i. A recent addition to akkas future is several monadic methods that are very similar to the. If you need a comprehensive and easy to follow manual for the scala language, the book programming in scala is the canonical reference text. Streaming data from postgresql using akka streams and slick in play framework. Any plans to releasepublish the epub or pdf version of akka 2. An introduction to scalaakka actors actors and concurrency. View message delivery reliability akka documentation. Net distributed actor framework, run the following command in the package manager console. An intuitive and safe way to do asynchronous, nonblocking backpressured stream processing. Scala sbt documentation in pdf format pdf file it took a lot of manual effort to turn the online documentation into 65 pages of a readable pdf doc, so i dont have any plans to update this as time goes on, but as mentioned, for the current date, its accurate. This is an excerpt from the scala cookbook partially modified for the internet. Akka provides scalable realtime transaction processing.
Understanding the methods in the scalaakka actor lifecycle. Akka uses the actor model to raise the abstraction level and provide a better platform to build correct concurrent and scalable applications. They are immutable but with constant time access and modification. Whats the difference of the akkas actor with scalas actor.
45 325 112 1422 395 949 506 34 1067 1481 273 231 592 898 720 1471 289 1423 159 575 816 1047 311 1317 875 435 333 819 316 739 1450 1400 166 1338 1346 975 629 752 248