def METHOD_NAME(self, filename_suffix, callback_func, **kwargs):
    self.databases = {}
    self.arch_lookup = {}
    self.filename_suffix = filename_suffix
    self.callback_func = callback_func
    # we really want a single path to arch mapping, so massage the data
    arch_paths = kwargs['arch_paths']
    for arch, paths in arch_paths.items():
        self.arch_lookup.update((path.rstrip('/'), arch) for path in paths)