JavaScript
ReasonMLActor Communication
An actor alone is a somewhat useless construct; actors need to work together. Actors can send messages to one another by using the dispatch method.
In this example, the actors Ping and Pong are playing a perfect ping-pong match. To start the match, we dispatch a message to ping and specify that the sender in msgType is pong.
open Nact;
open Nact.Operators;
let system = start();
type msgType =
| Msg(actorRef(msgType), string);
let ping: actorRef(msgType) =
spawnStateless(
~name="ping",
system,
(Msg(sender, msg), ctx) => {
print_endline(msg);
dispatch(sender, Msg(ctx.self, ctx.name)) |> Js.Promise.resolve
}
);
let pong: actorRef(msgType) =
spawnStateless(
~name="pong",
system,
(Msg(sender, msg), ctx) => {
print_endline(msg);
/* Here we're using the <-< operator as a shorthand for the dispatch method */
sender <-< Msg(ctx.self, ctx.name) |> Js.Promise.resolve
}
);
ping <-< Msg(pong, "hello");
This produces the following console output:
begin
ping
pong
ping
pong
ping
...