module SassListen::Adapter

def self._log(type, message)
  SassListen::Logger.send(type, message)
end

def self._usable_adapter_class
  OPTIMIZED_ADAPTERS.detect(&:usable?)
end

def self._warn_polling_fallback(options)
  msg = options.fetch(:polling_fallback_message, POLLING_FALLBACK_MESSAGE)
  Kernel.warn "[SassListen warning]:\n  #{msg}" if msg
end

def self.select(options = {})
  _log :debug, 'Adapter: considering polling ...'
  return Polling if options[:force_polling]
  _log :debug, 'Adapter: considering optimized backend...'
  return _usable_adapter_class if _usable_adapter_class
  _log :debug, 'Adapter: falling back to polling...'
  _warn_polling_fallback(options)
  Polling
rescue
  _log :warn, format('Adapter: failed: %s:%s', $ERROR_POSITION.inspect,
                     $ERROR_POSITION * "\n")
  raise
end