class_name EventBusSubscription
extends Subscription

var key: Array
var callback: Callable
var bus: DefaultEventBus

func _init(_key: Array, _callback: Callable, _bus: DefaultEventBus):
	key = _key
	callback = _callback
	bus = _bus

func dispose() -> void:
	var subscriber_set: Array[EventBusSubscription] = bus.subscribers.get(key, [])
	subscriber_set.erase(self)
	if subscriber_set.is_empty():
		bus.subscribers.erase(key)
	else:
		bus.subscribers[key] = subscriber_set