How to use the cachier.pickle_core._PickleCore function in cachier

enabling different threads to share cache. Should be set to False for
        faster reads in single-thread programs. Defaults to True.
    mongetter (optional) : callable
        A callable that takes no arguments and returns a pymongo.Collection
        object with writing permissions. If unset a local pickle cache is used
        instead.
    """
    # print('Inside the wrapper maker')
    # print('mongetter={}'.format(mongetter))
    # print('stale_after={}'.format(stale_after))
    # print('next_time={}'.format(next_time))

    if mongetter:
        core = _MongoCore(mongetter, stale_after, next_time)
    else:
        core = _PickleCore(  # pylint: disable=R0204
            stale_after, next_time, pickle_reload)

    def _cachier_decorator(func):
        core.set_func(func)

        @wraps(func)
        def func_wrapper(*args, **kwds):  # pylint: disable=C0111,R0911
            # print('Inside general wrapper for {}.'.format(func.__name__))
            ignore_cache = kwds.pop('ignore_cache', False)
            overwrite_cache = kwds.pop('overwrite_cache', False)
            verbose_cache = kwds.pop('verbose_cache', False)
            _print = lambda x: None
            if verbose_cache:
                _print = print
            if ignore_cache:
                return func(*args, **kwds)