Implementação do pub/sub na mão equivalente a gem Wisper

pub_sub.rb

module Susurro
  def subscribe(handler)
    subscribers << {name: nil, handler: handler}

    self
  end

  def on(event_name, &handler)
    subscribers << {name: event_name, handler: handler}

    self
  end

  def publish(event_name, data)
    subscribers.each do |event|
      handler = event[:handler]

      if event[:name] == event_name
        handler.call(data)
      elsif handler.respond_to?(event_name)
        handler.public_send(event_name, data)
      end
    end
  end

  alias_method :broadcast, :publish

  private

  def subscribers
    @subscribers ||= []
  end
end

class Person
  include Susurro

  def name=(name)
    publish(:name_changed, {from: @name, to: name})

    @name = name
  end

  def name
    @name
  end
end

class NameChangeListener
  def name_changed(data)
    puts '======='
    puts "from: #{data[:from]}"
    puts "to: #{data[:to]}"
    puts '======='
  end
end

person = Person.new

person.on(:name_changed) do |data|
  p data
end

person.name = 'Rodrigo'

person.name = 'Serradura'

person.subscribe(NameChangeListener.new)

person.name = 'Rodrigo Serradura'

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