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Akka in action
  JAX London 2012
   Heiko Seeberger
What is scalability?
What is scalability?


• Ability of a system to handle growing work or
What is scalability?


• Ability of a system to handle growing work or
• its ability to be enlarged to accommodate growth.
Why should we
care about scalability?
Because of the human nature
So how can we build
  scalable systems?
Scaling up
Concurrency



 Scaling up
Scaling out
Distribution



Scaling out
So how can we easily build
    scalable systems?
Akka’s vision
Akka’s vision

• Simpler concurrency (scale up)
Akka’s vision

• Simpler concurrency (scale up)
• Simpler distribution (scale out)
Akka’s vision

• Simpler concurrency (scale up)
• Simpler distribution (scale out)
• Simpler fault-tolerance (self healing)
Akka’s vision

• Simpler concurrency (scale up)
• Simpler distribution (scale out)
• Simpler fault-tolerance (self healing)
• All of that with a single unified programming model
The Akka toolkit
The Akka toolkit


• Akka runs on the JVM
The Akka toolkit


• Akka runs on the JVM
• Akka can be used from Java and Scala
The Akka toolkit


• Akka runs on the JVM
• Akka can be used from Java and Scala
• Akka can be integrated with common infrastructure,
  e.g. Spring, Camel, ZeroMQ, etc.
What’s inside the toolbox?
What’s inside the toolbox?

• Actors
What’s inside the toolbox?

• Actors
• Agents
What’s inside the toolbox?

• Actors
• Agents
• Dataflow concurrency
What’s inside the toolbox?

• Actors
• Agents
• Dataflow concurrency
• STM
What is an actor?
What is an actor?

• Carl Hewitt (1973): Fundamental unit of computation
What is an actor?

• Carl Hewitt (1973): Fundamental unit of computation
  •   Behavior - react on messages it receives
What is an actor?

• Carl Hewitt (1973): Fundamental unit of computation
  •   Behavior - react on messages it receives

  •   State - shielded from the rest of the world, no need for synchronization
What is an actor?

• Carl Hewitt (1973): Fundamental unit of computation
  •   Behavior - react on messages it receives

  •   State - shielded from the rest of the world, no need for synchronization

  •   Communication - interact with other actors exclusively via messages
What is an actor?

• Carl Hewitt (1973): Fundamental unit of computation
  •   Behavior - react on messages it receives

  •   State - shielded from the rest of the world, no need for synchronization

  •   Communication - interact with other actors exclusively via messages


• “One actor is no actor” - they come in systems
Other notions of an actor
Other notions of an actor


• Implementation of message passing concurrency
Other notions of an actor


• Implementation of message passing concurrency
• Isolated lightweight processes
Other notions of an actor


• Implementation of message passing concurrency
• Isolated lightweight processes
• Asynchronous and non-blocking
The Akka Actor
The Akka Actor
The Akka Actor
The Akka Actor
Receive messages
Receive messages

public class Hello extends UntypedActor {

    @Override
    public void onReceive(Object message) {
      System.out.println("Hello, world!");
    }
}
Receive messages

public class Hello extends UntypedActor {

    public int count = 0;

    @Override
    public void onReceive(Object message) {
      count += 1;
      System.out.println(
        "Hello for the " + count + " time!"
      );
    }
}
Receive messages

public class Hello extends UntypedActor {

    public int count = 0;
          One at a time
    @Override
    public void onReceive(Object message) {
      count += 1;
      System.out.println(
        "Hello for the " + count + " time!"
      );
    }
}
Send messages
Send messages


  ActorRef hello = ...
  hello.tell("Hi!");
Send messages


Asynchronous and
   ActorRef hello = ...
   hello.tell("Hi!");
   nonblocking
The Akka ActorSystem
The Akka ActorSystem
The Akka ActorSystem
Create an actor system
Create an actor system


   ActorSystem system =
     ActorSystem.create("hello");
Create a top-level actor
Create a top-level actor


 ActorRef hello =
   system.actorOf(new Props(new Hello()));
Create a child actor
Create a child actor


ActorRef child =
  context().actorOf(new Props(new Child()));
Embrace failure
Embrace failure


• Let it crash!
Embrace failure


• Let it crash!
• Supervision: Like in real life, parents supervise their children
Embrace failure


• Let it crash!
• Supervision: Like in real life, parents supervise their children
• Depending on the parent’s supervisor strategy,
  failing actors can get stopped, restarted or resumed
HakkyHour demo
The HakkyHour bar
The HakkyHour bar

• Our drinks: Akkarita, MaiPlay, PinaScalada
The HakkyHour bar

• Our drinks: Akkarita, MaiPlay, PinaScalada
• Our actors: guests, waiters, head waiter, barkeepers
The HakkyHour bar

• Our drinks: Akkarita, MaiPlay, PinaScalada
• Our actors: guests, waiters, head waiter, barkeepers
• Our messages: Order, drink served, complaint, etc.
The HakkyHour bar

• Our drinks: Akkarita, MaiPlay, PinaScalada
• Our actors: guests, waiters, head waiter, barkeepers
• Our messages: Order, drink served, complaint, etc.
• Our failures: Guest drunk, waiter frustrated
HakkyHour actor system
HakkyHour messages
HakkyHour messages
HakkyHour messages
HakkyHour messages
HakkyHour messages
HakkyHour messages
HakkyHour messages
Live demo ...
Why does Akka make building
  scalable systems easy?
Benefits of using Akka actors
Benefits of using Akka actors


• You don’t have to deal with concurrency details
Benefits of using Akka actors


• You don’t have to deal with concurrency details
• You can manage failures easily
Benefits of using Akka actors


• You don’t have to deal with concurrency details
• You can manage failures easily
• Distribution is just a deployment decision
  (not covered here)
Questions?
Thank you!
Twitter: @hseeberger

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Akka in Action: Heiko Seeburger