gistfile1.rbx

require 'rubygems'
require 'eventmachine'

GC.disable

class Test
  Instances = {}
  def initialize name
    @name = name
    Instances[name] = self
  end
  def remove secs = nil
    self.class.delete(@name, secs)
  end
  def self.delete name, secs = nil
    if secs
      @delete_timers ||= {}
      @delete_timers[name].cancel if @delete_timers.has_key? name
      @delete_timers[name] = EM::Timer.new(secs){ delete name }
    else
      # WTF? uncomment either of the lines below, and the instance will get GC'd
      # Instances[name] = nil
      # p [Time.now, :DELETING, name]
      Instances.delete(name)
    end
  end
end

def Test.check_objects
  EM.add_periodic_timer(0.5) {
    GC.enable
    ObjectSpace.garbage_collect
    GC.disable

    c = 0
    ObjectSpace.each_object(Test){ c+=1 }
    p [Time.now, :OBJECTS, c]
  }
end

def Test.run
  Test.new('hello')
  prc = Proc.new{ Test.delete('hello'); nil }

  # EM.add_timer 0, prc
  # EM.add_timer 0 do prc.call end

  # EM.next_tick prc
  # EM.next_tick do prc.call end

  # prc.call
end

def Test.run2
  t = Test.new(:abc)
  # t.remove
  t.remove(0)
end

EM.run{
  Test.check_objects
  Test.run2
}