Class: Class

Inherits:
Object show all
Defined in:
lib/epitools/core_ext/class.rb

Instance Method Summary collapse

Instance Method Details

#trace_messages_to(*meths) ⇒ Object

Trace the specified method calls (‘meths`, as symbols) to descendends of this class (or all methods if `:*` is supplied). Output is printed to $stderr.



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# File 'lib/epitools/core_ext/class.rb', line 7

def trace_messages_to(*meths)
  return unless $DEBUG

  tracers = Module.new
  parent  = self

  $stderr.puts "[*] Tracing messages sent to #{parent} (messages: #{meths.join(", ")})"

  meths.each do |meth|
    case meth
    when :*
      tracers.define_method(:send) do |meth, *args, &block|
        p meth, args, block
        super(meth, *args, &block)
      end
    else
      tracers.define_method(meth) do |*args, &block|
        arg_names = args.map(&:inspect)
        arg_names << "&block" if block
        $stderr.puts "[*] #{parent}##{meth}(#{arg_names.join(", ")})"
        if block
          super(*args, &block)
        else
          super(*args)
        end
      end
    end
  end

  self.prepend(tracers)
end