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Jeremy Pierre. Yet Another Developer j14159. The Basics of Sane Concurrency.
Akka: The Smash and Grab Intro twitter.com/hootsuite facebook.com/hootsuite.
Akka: The Smash and Grab Intro The Basics of Sane Concurrency
Jeremy Pierre Yet Another Developer @ j14159
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Akka What? Don’t call it a framework
So...?
A toolkit for sane concurrency. • Not just about actors • Blocking is bad, event-based is good • Crashing is not the end of the world
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The Overview What I’ll Cover:
• Actors and ActorSystems
• Supervision(in passing) • Futures and Promises • Some interesting stuff with execution contexts, event buses and schedulers
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The Overview What I’ll Cover:
• Actors and ActorSystems
• Supervision(in passing) • Futures and Promises • Some interesting stuff with execution contexts, event buses and schedulers What I’m Not Covering
To help it all make sense... We use the Librarian Problem: • A Library has one Librarian but many Interns. • Interns do not know where to find specific books. • The Librarian can’t go find books for customers because they can then only help one at a time.
• If the Librarian tells the Interns where to find stuff, many book requests can be handled at the same time.
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Akka Actors The logical extreme of OOP and Information Hiding
• There’s only one method
to make it do stuff(tell / !) • They’re purely eventbased • They live in ActorSystems
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ActorSystem
• They make ActorRefs • They’re the root of a hierarchy(think file system)
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ActorSystem
• They make ActorRefs • They’re the root of a hierarchy(think file system)
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ActorSystem
• They make ActorRefs • They’re the root of a hierarchy(think file system)
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Futures... ...let us do asynchronous stuff without an Actor
But where’s the result?
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Futures... ...let us do asynchronous stuff without an Actor
But where’s the result?
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Promises The “write” side of Futures
But that looks kind of boring...
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Promises The “write” side of Futures
But that looks kind of boring...
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One more Promise
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Using the results of Future/Promise As you’d expect, this gives you another Future:
This callback is for side-effecting:
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Event Bus and Scheduler EventBus is (very) simple pub-sub for Actors:
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Event Bus and Scheduler EventBus is (very) simple pub-sub for Actors:
Scheduler?
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Event Bus and Scheduler EventBus is (very) simple pub-sub for Actors:
Scheduler makes stuff happen when you want it to:
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Asking and Piping import akka.pattern.ask
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Asking and Piping import akka.pattern.ask
import akka.pattern.pipe
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ExecutionContext Futures and Promises need it
• It basically hides a java.util.concurrent.Executor • Your ActorSystem’s dispatcher is one • You can create them via configuration or programmatically
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Mix Them!
Never block your ActorSystem’s threads for DB calls! twitter.com/hootsuite
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Thank You! Jeremy Pierre Yet Another Developer @j14159
