chat.nula

// Chat Room — actors send messages to each other.
// Demonstrates actor spawn, state, behaviors, and message passing.
// Run with: nulang examples/book/chat.nula

actor ChatRoom {
    state messages: Int = 0

    behavior broadcast(sender_name: String, text: String) {
        self.messages = self.messages + 1
        perform IO.print("[" + sender_name + "]: " + text)
    }

    behavior count() {
        perform IO.print(
            "Total messages: " + perform Int.to_string(self.messages)
        )
    }
}

actor ChatClient {
    state room_ref = 0

    behavior init(room: Int) {
        self.room_ref = room
    }

    behavior say(name: String, text: String) {
        self.room_ref ! broadcast(name, text)
    }
}

fn main() {
    let room = spawn ChatRoom {}

    let alice = spawn ChatClient {}
    let bob = spawn ChatClient {}

    alice ! init(room)
    bob ! init(room)

    alice ! say("Alice", "Hello!")
    bob ! say("Bob", "Hi Alice!")

    room ! count()
    0
}