actix 0.5.3

Actor framework for Rust
Documentation 
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extern crate actix;
extern crate futures;

use futures::Future;
use actix::prelude::*;

/// Define `Ping` message
struct Ping(usize);

impl Message for Ping {
    type Result = usize;
}

/// Actor
struct MyActor {
    count: usize,
}

/// Declare actor and it's context
impl Actor for MyActor {
    type Context = Context<Self>;
}

/// Handler for `Ping` message
impl Handler<Ping> for MyActor {
    type Result = usize;

    fn handle(&mut self, msg: Ping, _: &mut Context<Self>) -> Self::Result {
        self.count += msg.0;
        self.count
    }
}

fn main() {
    // start system, this is required step
    let system = System::new("test");

    // start new actor
    let addr: Addr<Unsync, _> = MyActor{count: 10}.start();

    // send message and get future for result
    let res = addr.send(Ping(10));

    // handle() returns tokio handle
    Arbiter::handle().spawn(
        res.map(|res| {
            println!("RESULT: {}", res == 20);

            // stop system and exit
            Arbiter::system().do_send(actix::msgs::SystemExit(0));
        })
        .map_err(|_| ()));

    system.run();
}