method_hooks_metaprogramming

🧰 Meta-Programming with Method Hooks

Intercept method definitions using method_added and singleton_method_added for instrumentation, analytics, or automated wrapping. Prepended modules can also hook into these events without polluting the target class.

module Tracker
  def self.prepended(base)
    base.extend ClassMethods
  end

  module ClassMethods
    def method_added(name)
      super
      puts "Added instance method: #{name}"
    end

    def singleton_method_added(name)
      super
      puts "Added class method: #{name}"
    end
  end
end

class Service
  prepend Tracker

  def perform; end
  def self.run; end
end
# Output:
# Added instance method: perform
# Added class method: run