class EventMachine::Synchrony::Multi

def add(name, conn)
  fiber = Fiber.current
  conn.callback { @responses[:callback][name] = conn; check_progress(fiber) }
  conn.errback  { @responses[:errback][name]  = conn; check_progress(fiber) }
  @requests.push(conn)
end

def check_progress(fiber)
  if finished?
    succeed
    # continue processing
    fiber.resume(self) if fiber.alive? && fiber != Fiber.current
  end
end

def finished?
  (@responses[:callback].size + @responses[:errback].size) == @requests.size
end

def initialize
  @requests = []
  @responses = {:callback => {}, :errback => {}}
end

def perform
  Fiber.yield unless finished?
end