class Concurrent::Actor::Behaviour::Linking

Links the actor to other actors and sends actor's events to them, like: `:terminated`, `:paused`, `:resumed`, errors, etc. Linked actor needs to handle those messages.

listener = AdHoc.spawn name: :listener do
  lambda do |message|
    case message
    when Reference
      if message.ask!(:linked?)
        message << :unlink
      else
        message << :link
      end
    else
      puts "got event #{message.inspect} from #{envelope.sender}"
    end
  end
end

an_actor = AdHoc.spawn name: :an_actor, supervise: true, behaviour_definition: Behaviour.restarting_behaviour_definition do
  lambda { |message| raise 'failed'}
end

# link the actor
listener.ask(an_actor).wait
an_actor.ask(:fail).wait
# unlink the actor
listener.ask(an_actor).wait
an_actor.ask(:fail).wait
an_actor << :terminate!

produces only two events, other events happened after unlinking

got event #<RuntimeError: failed> from #<Concurrent::Actor::Reference /an_actor (Concurrent::Actor::Utils::AdHoc)>
got event :reset from #<Concurrent::Actor::Reference /an_actor (Concurrent::Actor::Utils::AdHoc)>

Public Class Methods

new(core, subsequent, core_options) click to toggle source
# File lib/concurrent/actor/behaviour/linking.rb, line 43
def initialize(core, subsequent, core_options)
  super core, subsequent, core_options
  @linked = Set.new
  @linked.add Actor.current if core_options[:link] != false
end

Public Instance Methods

on_envelope(envelope) click to toggle source
# File lib/concurrent/actor/behaviour/linking.rb, line 49
def on_envelope(envelope)
  case envelope.message
  when :link
    link envelope.sender
  when :unlink
    unlink envelope.sender
  when :linked?
    @linked.include? envelope.sender
  when :linked
    @linked.to_a
  else
    pass envelope
  end
end
on_event(public, event) click to toggle source
# File lib/concurrent/actor/behaviour/linking.rb, line 74
def on_event(public, event)
  event_name, _ = event
  @linked.each { |a| a << event } if public
  @linked.clear if event_name == :terminated
  super public, event
end