Usage:

add dependency R_method(obj, dependant)

  add(obj, dependant, method = :finalize, *opt)
  add_dependency(obj, dependant, method = :finalize, *opt)

delete dependency R_method(obj, dependant)

  delete(obj_or_id, dependant, method = :finalize)
  delete_dependency(obj_or_id, dependant, method = :finalize)

delete dependency R_*(obj, dependant)

  delete_all_dependency(obj_or_id, dependant)

delete dependency R_method(*, dependant)

  delete_by_dependant(dependant, method = :finalize)

delete dependency R_*(*, dependant)

  delete_all_by_dependant(dependant)

delete all dependency R_*(*, *)

  delete_all

finalize the dependant connected by dependency R_method(obj, dependtant).

  finalize(obj_or_id, dependant, method = :finalize)
  finalize_dependency(obj_or_id, dependant, method = :finalize)

finalize all dependants connected by dependency R_*(obj, dependtant).

  finalize_all_dependency(obj_or_id, dependant)

finalize the dependant connected by dependency R_method(*, dependtant).

  finalize_by_dependant(dependant, method = :finalize)

finalize all dependants connected by dependency R_*(*, dependant).

  finalize_all_by_dependant(dependant)

finalize all dependency registered to the Finalizer.

  finalize_all

stop invoking Finalizer on GC.

  safe{..}