submanager.coffee

class ManagedSub
	constructor: (name, options = {}) ->
		self = @
		self.sub = null

		enter = ->
			options.enter?()

		# bind self.enter - it runs once per call
		self.enter = _.once enter

		# defite self.exit
		self.exit = ->
			options.exit?()

		# define main handle function, it runs once for delay ms
		self.handle = _.debounce false, (options.delay or 1000), (args...) ->
			# temporary sub to prevent documents mess. Subscribe Man!
			tmpSub = Meteor.subscribe name, args..., ->
				# sub done, redefine self.enter for the next time
				self.enter = _.once enter
				# call exit
				self.exit()

				# swap subs
				self.sub?.stop?()
				self.sub = tmpSub

	run: (args...) ->
		# call enter
		@enter()
		# run handle (no matter delay, just bind last args)
		@handle args...

	ready: ->
		@sub?.ready?()
	stop: ->
		@sub?.stop?()