@startuml actor-model

title Actor Model - UML Class Diagram

class ActorSystem {
  +actorOf(actor: Actor): Actor
  +shutdown(): void
}

class Actor {
  -mailbox: BlockingQueue<Message>
  -active: boolean
  +send(message: Message): void
  +stop(): void
  +run(): void
  #onReceive(message: Message): void
}

class ExampleActor {
  +onReceive(message: Message): void
}

class Message {
  -content: String
  -sender: Actor
  +getContent(): String
  +getSender(): Actor
}

ActorSystem --> Actor : creates
Actor <|-- ExampleActor : extends
Actor --> Message : processes
ExampleActor --> Message : uses

@enduml