Defining “method_called”.. How do I make a hook method which gets called every t

原文来自：?http://stackoverflow.com/questions/3236194/defining-method-called-how-do-i-make-a-hook-method-which-gets-called-every-t

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I want to make a hook method which gets called everytime any function of a class gets called. I have tried method_added, but it executes only once at the time of class definition,

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?Outputs:
class Base  def self.method_added(name)    if /hook/.match(name.to_s) or method_defined?("#{name}_without_hook")      return    end    hook = "def #{name}_hook\n p 'Method #{name} has been called'\n #{name}_without_hook\nend"    self.class_eval(hook)    a1 = "alias #{name}_without_hook #{name}"    self.class_eval(a1)    a2 = "alias #{name} #{name}_hook"    self.class_eval(a2)  end  def a    p "a called."  end  def b    p "b called."  endendt1 = Base.newt1.at1.bt1.at1.b
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