Class: Concurrent::Actor::Behaviour::Termination

Inherits:
Abstract
  • Object
show all
Defined in:
lib-edge/concurrent/actor/behaviour/termination.rb

Overview

Note:

Actor rejects envelopes when terminated.

Note:

TODO missing example

Handles actor termination. Waits until all its children are terminated, can be configured on behaviour initialization.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(core, subsequent, core_options, trapping = false, terminate_children = true) ⇒ Termination

Returns a new instance of Termination.



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# File 'lib-edge/concurrent/actor/behaviour/termination.rb', line 15

def initialize(core, subsequent, core_options, trapping = false, terminate_children = true)
  super core, subsequent, core_options
  @terminated         = Concurrent::Promises.resolvable_future
  @public_terminated  = @terminated.with_hidden_resolvable
  @trapping           = trapping
  @terminate_children = terminate_children
end

Instance Attribute Details

#terminated ⇒ undocumented (readonly) 



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# File 'lib-edge/concurrent/actor/behaviour/termination.rb', line 13

def terminated
  @terminated
end

Instance Method Details

#on_envelope(envelope) ⇒ undocumented 



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# File 'lib-edge/concurrent/actor/behaviour/termination.rb', line 37

def on_envelope(envelope)
  command, reason = envelope.message
  case command
  when :terminated?
    terminated?
  when :terminate!
    if trapping? && reason != :kill
      pass envelope
    else
      terminate! reason, envelope
    end
  when :termination_event
    @public_terminated
  else
    if terminated?
      reject_envelope envelope
      MESSAGE_PROCESSED
    else
      pass envelope
    end
  end
end

#terminate!(reason = nil, envelope = nil) ⇒ undocumented

Terminates the actor. Any Envelope received after termination is rejected. Terminates all its children, does not wait until they are terminated.



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# File 'lib-edge/concurrent/actor/behaviour/termination.rb', line 62

def terminate!(reason = nil, envelope = nil)
  return true if terminated?

  self_termination = Concurrent::Promises.resolved_future(reason.nil?, reason.nil? || nil, reason)
  all_terminations = if @terminate_children
                       Concurrent::Promises.zip(*children.map { |ch| ch.ask(:terminate!) }, self_termination)
                     else
                       self_termination
                     end

  all_terminations.chain_resolvable(@terminated)
  if envelope && envelope.future
    all_terminations.chain { |fulfilled, _, t_reason| envelope.future.resolve fulfilled, true, t_reason }
  end

  broadcast(true, [:terminated, reason]) # TODO do not end up in Dead Letter Router
  parent << :remove_child if parent

  MESSAGE_PROCESSED
end

#terminated? ⇒ true, false

Note:

Actor rejects envelopes when terminated.

Returns if actor is terminated.

Returns:

  • (true, false) —

    if actor is terminated



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# File 'lib-edge/concurrent/actor/behaviour/termination.rb', line 25

def terminated?
  @terminated.resolved?
end

#trapping=(val) ⇒ undocumented 



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# File 'lib-edge/concurrent/actor/behaviour/termination.rb', line 33

def trapping=(val)
  @trapping = !!val
end

#trapping? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib-edge/concurrent/actor/behaviour/termination.rb', line 29

def trapping?
  @trapping
end