mirror of
https://github.com/GNS3/gns3-server.git
synced 2024-11-18 01:34:50 +02:00
65 lines
1.9 KiB
Python
65 lines
1.9 KiB
Python
#!/usr/bin/env python
|
|
#
|
|
# Copyright (C) 2016 GNS3 Technologies Inc.
|
|
#
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU 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 General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
import asyncio
|
|
|
|
|
|
class Pool():
|
|
"""
|
|
Limit concurrency for running parallel tasks
|
|
"""
|
|
|
|
def __init__(self, concurrency=5):
|
|
self._tasks = []
|
|
self._concurrency = concurrency
|
|
|
|
def append(self, task, *args, **kwargs):
|
|
self._tasks.append((task, args, kwargs))
|
|
|
|
async def join(self):
|
|
"""
|
|
Wait for all task to finish
|
|
"""
|
|
pending = set()
|
|
exceptions = set()
|
|
while len(self._tasks) > 0 or len(pending) > 0:
|
|
while len(self._tasks) > 0 and len(pending) < self._concurrency:
|
|
task, args, kwargs = self._tasks.pop(0)
|
|
pending.add(asyncio.create_task(task(*args, **kwargs)))
|
|
(done, pending) = await asyncio.wait(pending, return_when=asyncio.FIRST_COMPLETED)
|
|
for task in done:
|
|
if task.exception():
|
|
exceptions.add(task.exception())
|
|
if len(exceptions) > 0:
|
|
raise exceptions.pop()
|
|
|
|
|
|
def main():
|
|
async def task(id):
|
|
print("Run", id)
|
|
await asyncio.sleep(0.5)
|
|
|
|
pool = Pool(concurrency=5)
|
|
for i in range(1, 20):
|
|
pool.append(task, i)
|
|
loop = asyncio.get_event_loop()
|
|
loop.run_until_complete(pool.join())
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|