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########################################################################
# File name: custom_queue.py
# This file is part of: aioxmpp
#
# LICENSE
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program. If not, see
# <http://www.gnu.org/licenses/>.
#
########################################################################
import asyncio
import collections
class AsyncDeque:
def __init__(self, *, loop=None):
super().__init__()
self._loop = loop
self._data = collections.deque()
self._non_empty = asyncio.Event(loop=self._loop)
self._non_empty.clear()
def __len__(self):
return len(self._data)
def __contains__(self, obj):
return obj in self._data
def empty(self):
return not self._non_empty.is_set()
def put_nowait(self, obj):
self._data.append(obj)
self._non_empty.set()
def putleft_nowait(self, obj):
self._data.appendleft(obj)
self._non_empty.set()
def get_nowait(self):
try:
item = self._data.popleft()
except IndexError:
raise asyncio.QueueEmpty() from None
if not self._data:
self._non_empty.clear()
return item
def getright_nowait(self):
try:
item = self._data.pop()
except IndexError:
raise asyncio.QueueEmpty() from None
if not self._data:
self._non_empty.clear()
return item
async def get(self):
while not self._data:
await self._non_empty.wait()
return self.get_nowait()
def clear(self):
self._data.clear()
self._non_empty.clear()
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