Question

我正在寻找一种方法（库或元编程技巧）来挂钩方法定义，这样我就可以扩展某些类并捕获它们的方法（重新）定义“事件”。

Answer 1

有 method_added 回调（遗憾的是，请参阅http://www.ruby-doc.org/core/classes/Module.html#M001662，没有文档）。您可以按如下方式使用它：

class Foo

  # define the callback...      
  def self.method_added(method_name)
    puts "I now have a method called #{method_name}"
  end

  # the callback is called on normal method definitions
  def foo
    # "I now have a method called foo" will be printed
  end

  # the callback is called on method definitions using define_method
  define_method :bar do
    # "I now have a method called bar" will be printed
  end

  # the callback is called on method definitions using alias and the likes
  alias :baz :foo # "I now have a method called baz" will be printed
end

Answer 2

您是否尝试重写“define_method”？至少你可以捕获一些“运行时”方法定义？

Answer 3

覆盖method_added。但请记住，如果您动态修改method_added中的方法，那么这些方法也会导致method_added被调用，因此您需要知道哪些方法是您所关注的用以避免无限递归。

Ruby：在运行时观察方法（重新）定义

3 个答案: