You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: callback.rb
    path of file: ./repos/kontena/cli/lib/kontena
    
    the code of the file until where you have to start completion: class Kontena::Callback

  attr_reader :command

  def initialize(command)
    @command = command
  end

  # Register callback for command types it is supposed to run with.
  def self.
    
  def self.matches_commands(*commands)
    cmd_types = {}

    commands.each do |cmd|
      cmd_class, cmd_type = cmd.split(' ', 2)

      if cmd_class == '*'
        cmd_class = :all
      end

      if cmd_type.nil? || cmd_type == '*'
        cmd_type = :all
      else
        cmd_type = cmd_type.to_sym
      end