gistfile1.rb

  def get_server_for_key(key)
    raise ArgumentError, "illegal character in key #{key.inspect}" if key =~ /\s/
    raise ArgumentError, "key too long #{key.inspect}" if key.length > 250
    raise MemCacheError, "No servers available" if @servers.empty?

    # Ignores server weights, oh well
    srvs = self.servers.dup
    srvs.size.times do |try|
      n = rand(srvs.size)
      server = srvs[n]
      return server if server.alive?
      srvs.delete_at(n)
    end
  
    raise MemCacheError, "No servers available (all dead)"
  end