Async Method calls

Async calls let an actor tell another actor to do something without waiting for a return value.

A method call is asynchronous when the caller does not use the return value.

actor Worker(name):
    def say(msg):
        print(name, "received:", msg)

actor main(env):
    w1 = Worker("one")
    w2 = Worker("two")

    w1.say("hello")
    w2.say("world")

    def stop():
        env.exit(0)
    after 0.1: stop()

Here, main sends two messages and keeps going. It does not wait for either worker to return a value.

When to use async calls

• use them for fire-and-forget work
• use them when another actor should react independently
• use them to avoid blocking the current actor on a result