mirror of https://github.com/nocturn9x/giambio.git
71 lines
2.0 KiB
Python
71 lines
2.0 KiB
Python
"""
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Copyright (C) 2020 nocturn9x
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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from ._core import AsyncScheduler
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from ._layers import Task
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import types
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class TaskManager:
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"""
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An asynchronous context manager for giambio
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"""
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def __init__(self, loop: AsyncScheduler) -> None:
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"""
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Object constructor
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"""
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self.loop = loop
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def spawn(self, func: types.FunctionType, *args):
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"""
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Spawns a child task
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"""
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task = Task(func(*args))
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self.loop.tasks.append(task)
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return task
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def spawn_after(self, func: types.FunctionType, n: int, *args):
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"""
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Schedules a task for execution after n seconds
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"""
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assert n >= 0, "The time delay can't be negative"
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task = Task(func(*args))
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self.loop.paused.put(task, n)
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return task
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async def __aenter__(self):
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self.loop.catch = True # Restore event loop's status
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return self
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async def __aexit__(self, exc_type, exc, tb):
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for task in self.loop.tasks:
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try:
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await task.join()
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except BaseException as e:
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for task in self.loop.tasks:
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await task.cancel()
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for _, __, task in self.loop.paused:
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await task.cancel()
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for tasks in self.loop.event_waiting.values():
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for task in tasks:
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await task.cancel()
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self.loop.catch = False
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raise e
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