# Copyright (c) 2023, NVIDIA CORPORATION. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from queue import Empty, Full, Queue
from threading import Lock
from typing import Union
from nvflare.fuel.utils.constants import Mode
from nvflare.fuel.utils.pipe.pipe import Message, Pipe
[docs]class MemoryPipe(Pipe):
PIPE_PAIRS = {}
LOCK = Lock()
def __init__(self, token: str, mode: Mode = Mode.ACTIVE):
super().__init__(mode)
self.token = token
self.put_queue = None
self.get_queue = None
[docs] def open(self, name: str):
with MemoryPipe.LOCK:
if self.token in MemoryPipe.PIPE_PAIRS:
x_queue, y_queue = MemoryPipe.PIPE_PAIRS[self.token]
else:
x_queue = Queue()
y_queue = Queue()
MemoryPipe.PIPE_PAIRS[self.token] = (x_queue, y_queue)
if self.mode == Mode.ACTIVE:
self.put_queue = x_queue
self.get_queue = y_queue
else:
self.put_queue = y_queue
self.get_queue = x_queue
[docs] def close(self):
with MemoryPipe.LOCK:
if self.token in MemoryPipe.PIPE_PAIRS:
MemoryPipe.PIPE_PAIRS.pop(self.token)
[docs] def send(self, msg: Message, timeout=None) -> bool:
try:
self.put_queue.put(msg, block=False, timeout=timeout)
return True
except Full:
return False
[docs] def receive(self, timeout=None) -> Union[Message, None]:
try:
return self.get_queue.get(block=False, timeout=timeout)
except Empty:
return None
[docs] def can_resend(self) -> bool:
return False