Create a proxy object class

about_proxy_object_project.rb

# Answer to a ruby koan:
#   http://koans.heroku.com/en/about_proxy_object_project

# Project: Create a Proxy Class
#
# In this assignment, create a proxy class (one is started for you
# below).  You should be able to initialize the proxy object with any
# object.  Any messages sent to the proxy object should be forwarded
# to the target object.  As each message is sent, the proxy should
# record the name of the method send.
#
# The proxy class is started for you.  You will need to add a method
# missing handler and any other supporting methods.  The specification
# of the Proxy class is given in the AboutProxyObjectProject koan.

class Proxy
  def initialize(object)
    @object = object

    # keep track of objects called on the proxied object,
    # and how many times each was called
    @messages = {}
  end

  def method_missing(name, *args, &block)
    if @object.respond_to? name
      @messages[name] = (@messages[name] || 0) + 1
      @object.send(name, *args, &block)
    else
      super(name, *args, &block)
    end
  end

  def called?(name)
    @messages.include? name
  end

  def number_of_times_called name
    @messages[name] || 0
  end

  def messages
    @messages.keys
  end
end