84 lines
2.6 KiB
Ruby
84 lines
2.6 KiB
Ruby
module Concurrent
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module Actor
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module Behaviour
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# TODO track what is linked, clean when :terminated
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# send :linked/:unlinked messages back to build the array of linked actors
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# Links the actor to other actors and sends actor's events to them,
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# like: `:terminated`, `:paused`, `:resumed`, errors, etc.
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# Linked actor needs to handle those messages.
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#
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# listener = AdHoc.spawn name: :listener do
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# lambda do |message|
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# case message
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# when Reference
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# if message.ask!(:linked?)
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# message << :unlink
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# else
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# message << :link
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# end
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# else
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# puts "got event #{message.inspect} from #{envelope.sender}"
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# end
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# end
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# end
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#
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# an_actor = AdHoc.spawn name: :an_actor, supervise: true, behaviour_definition: Behaviour.restarting_behaviour_definition do
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# lambda { |message| raise 'failed'}
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# end
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#
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# # link the actor
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# listener.ask(an_actor).wait
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# an_actor.ask(:fail).wait
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# # unlink the actor
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# listener.ask(an_actor).wait
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# an_actor.ask(:fail).wait
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# an_actor << :terminate!
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#
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# produces only two events, other events happened after unlinking
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#
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# got event #<RuntimeError: failed> from #<Concurrent::Actor::Reference /an_actor (Concurrent::Actor::Utils::AdHoc)>
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# got event :reset from #<Concurrent::Actor::Reference /an_actor (Concurrent::Actor::Utils::AdHoc)>
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class Linking < Abstract
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def initialize(core, subsequent, core_options)
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super core, subsequent, core_options
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@linked = Set.new
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@linked.add Actor.current if core_options[:link] != false
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end
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def on_envelope(envelope)
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case envelope.message
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when :link
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link envelope.sender
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when :unlink
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unlink envelope.sender
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when :linked?
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@linked.include? envelope.sender
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when :linked
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@linked.to_a
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else
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pass envelope
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end
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end
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def link(ref)
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@linked.add(ref)
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true
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end
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def unlink(ref)
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@linked.delete(ref)
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true
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end
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def on_event(public, event)
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event_name, _ = event
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@linked.each { |a| a << event } if public
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@linked.clear if event_name == :terminated
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super public, event
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end
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end
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end
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end
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end
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