Download PDF by Raymond Roestenburg: Akka in Action

By Raymond Roestenburg

Akka is a Scala-based toolkit that simplifies constructing concurrent disbursed functions. excellent for high-volume purposes that have to scale speedily, Akka is a good starting place for event-driven platforms that are looking to scale elastically up and out on call for, either on multi-core processors and throughout server nodes.
Akka in motion is a complete instructional on construction message-oriented platforms utilizing Akka. The e-book takes a hands-on process, the place each one new proposal is via an instance that exhibits the way it works, the way to enforce the code, and the way to check it. Readers will discover a message-oriented event-driven program in Akka and likewise take on key concerns like the way to version immutable messages and area versions, and practice styles like occasion Sourcing, and CQRS. The ebook concludes with useful recommendation on the right way to track and customise a process outfitted with Akka.

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Asynchronicity - Actors are meant to be run in parallel on several threads. Multi-threaded tests are more difficult than single-threaded tests and require concurrency primitives like locks, latches and barriers to synchronize results from various actors. Exactly the kind of thing we wanted to get a bit further away from. Incorrect usage of just one barrier can block a unit test which in turn halts the execution of a full test suite. Statelessness - An actor hides its internal state and does not allow access to this state.

This command also added a git remote with the name heroku to the git configuration. All we have to do now is make sure all changes are committed locally to the git repository. After that push the code to heroku with the following command: git push heroku master The above assumes that you committed any changes to your master branch. Heroku hooks into the git push process and identifies the code as a Scala App. It ©Manning Publications Co. We welcome reader comments about anything in the manuscript - other than typos and other simple mistakes.

This is it for the SilentActor types: single and multi threaded variants. Using these approaches, we can construct tests that are very familiar to most programmers: state changes can be inspected and asserted upon by leveraging a few tools in the TestKit. 2 SendingActor Example Returning to our ticketing example from Chapter 1, we need to test the fact that when we buy a Ticket to an Event , the count of available tickets is properly decremented. There's a Lakers vs Bulls game and we want to be able to support any number of requests for tickets.

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Akka in Action by Raymond Roestenburg

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