# coding: utf-8
# Modified Work: Copyright (c) 2016, 2022, Oracle and/or its affiliates.  All rights reserved.
# This software is dual-licensed to you under the Universal Permissive License (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl or Apache License 2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose either license.
# Copyright 2008-2016 Andrey Petrov and contributors

import collections

from ..packages import six
from ..packages.six.moves import queue

if six.PY2:
    # Queue is imported for side effects on MS Windows. See issue #229.
    import Queue as _unused_module_Queue  # noqa: F401


class LifoQueue(queue.Queue):
    def _init(self, _):
        self.queue = collections.deque()

    def _qsize(self, len=len):
        return len(self.queue)

    def _put(self, item):
        self.queue.append(item)

    def _get(self):
        return self.queue.pop()
