class Async::Debug::Selector

def close
	if @monitors.any?
		raise RuntimeError, "Trying to close selector with active monitors: #{@monitors.values.inspect}!"
	end
ensure
	@selector.close
end

def deregister(object)
	Async.logger.debug(self) {"Deregistering #{object.inspect}."}
	
	unless io = ::IO.try_convert(object)
		raise RuntimeError, "Could not convert #{io} into IO!"
	end
	
	unless @monitors.delete(io.fileno)
		raise RuntimeError, "Trying to remove monitor for #{io.inspect} but it was not registered!"
	end
end

def initialize(selector = NIO::Selector.new)
	@selector = selector
	@monitors = {}
end

def register(object, interests)
	Async.logger.debug(self) {"Registering #{object.inspect} for #{interests}."}
	
	unless io = ::IO.try_convert(object)
		raise RuntimeError, "Could not convert #{io} into IO!"
	end
	
	if monitor = @monitors[io.fileno]
		raise RuntimeError, "Trying to register monitor for #{object.inspect} but it was already registered: #{monitor.inspect}!"
	end
	
	monitor = Monitor.new(@selector.register(object, interests), self)
	
	@monitors[io.fileno] = monitor
	
	return monitor
end

def select(*args)
	@selector.select(*args)
end

def wakeup
	@selector.wakeup
end