Module: Observation::Dispatcher

Defined in:
lib/observation/dispatcher.rb

Instance Method Summary collapse

Instance Method Details

#add_listener(event_type, callback = nil, &block) ⇒ Object 



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# File 'lib/observation/dispatcher.rb', line 2

def add_listener(event_type, callback = nil, &block)
  setup_event_dispatcher
  validate_event_type(event_type)

  if (callback && block) || (callback.nil? && block.nil?)
    raise('You must provide a callback or block, but not both')
  end

  cb = (callback || block)
  callbacks = (@dispatcher_callbacks[event_type] ||= [])

  if callbacks.include?(cb)
    return false
  end

  callbacks << cb

  return true
end

#listening_event_types ⇒ Object 



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# File 'lib/observation/dispatcher.rb', line 48

def listening_event_types
  setup_event_dispatcher

  return @dispatcher_callbacks.keys
end

#remove_all_listeners(event_type) ⇒ Object 



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# File 'lib/observation/dispatcher.rb', line 39

def remove_all_listeners(event_type)
  setup_event_dispatcher
  validate_event_type(event_type)

  @dispatcher_callbacks.delete(event_type)

  return true
end

#remove_listener(event_type, callback) ⇒ Object 



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# File 'lib/observation/dispatcher.rb', line 22

def remove_listener(event_type, callback)
  setup_event_dispatcher
  validate_event_type(event_type)

  if (callbacks = @dispatcher_callbacks[event_type])
    if callbacks.delete(callback)
      if callbacks.empty?
        @dispatcher_callbacks.delete(event_type)
      end

      return true
    end
  end

  return false
end