Simple Event Manager in Ruby

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class Event
 USER_CONNECTED = 1
 SERVER_CONNECTED = 2
end

class Listener
 def onEvent(event,params=[])
   puts event
 end
end

class EventManager
 def initialize()
   @listenersMap = Hash.new
 end

 def subscribe(event,listener)
   listeners = @listenersMap[event]
   if listeners == nil
     @listenersMap[event] = Array.new
   else
     if @listenersMap[event].include?(listener)
       return
     end
   end
   @listenersMap[event].push(listener)
 end

 def notify(event)
   if @listenersMap[event] != nil
     @listenersMap[event].each do |lis|
       lis.onEvent(event)
     end
   end
 end
end

puts "Initializing the event manager"
lis = Listener.new
manager = EventManager.new
manager.subscribe(Event::USER_CONNECTED,lis)
manager.subscribe(Event::USER_CONNECTED,lis)
manager.notify(Event::USER_CONNECTED)