Class: Concurrent::Actor::Utils::Balancer

Inherits:
RestartingContext show all
Defined in:
lib/concurrent/actor/utils/balancer.rb

Overview

Distributes messages between subscribed actors. Each actor’ll get only one message then it’s unsubscribed. The actor needs to resubscribe when it’s ready to receive next message. It will buffer the messages if there is no worker registered.

See Also:

Instance Attribute Summary

Attributes inherited from AbstractContext

#core

Instance Method Summary collapse

Methods inherited from RestartingContext

#behaviour_definition

Methods inherited from AbstractContext

#ask, #behaviour_definition, #dead_letter_routing, #default_executor, #default_reference_class, #envelope, #on_envelope, #on_event, #pass, spawn, spawn!, #tell

Methods included from InternalDelegations

#behaviour, #behaviour!, #children, #context, #dead_letter_routing, #log, #redirect, #terminate!, #terminated?

Methods included from PublicDelegations

#context_class, #executor, #name, #parent, #path, #reference

Methods included from TypeCheck

#Child!, #Child?, #Match!, #Match?, #Type!, #Type?

Constructor Details

#initialize ⇒ Balancer

Returns a new instance of Balancer.



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# File 'lib/concurrent/actor/utils/balancer.rb', line 11

def initialize
  @receivers = []
  @buffer    = []
end

Instance Method Details

#distribute ⇒ Object 



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# File 'lib/concurrent/actor/utils/balancer.rb', line 35

def distribute
  while !@receivers.empty? && !@buffer.empty?
    redirect @receivers.shift, @buffer.shift
  end
end

#on_message(message) ⇒ Object 



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# File 'lib/concurrent/actor/utils/balancer.rb', line 16

def on_message(message)
  command, who = message
  case command
  when :subscribe
    @receivers << (who || envelope.sender)
    distribute
    true
  when :unsubscribe
    @receivers.delete(who || envelope.sender)
    true
  when :subscribed?
    @receivers.include?(who || envelope.sender)
  else
    @buffer << envelope
    distribute
    Behaviour::MESSAGE_PROCESSED
  end
end