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Adding abillity to write classes with awaitable initialization function.
.. contents:: Table of contents
.. code:: python :name: test_simple
import asyncio
from async_class import AsyncClass, AsyncObject, task, link
class MyAsyncClass(AsyncClass):
async def __ainit__(self):
# Do async staff here
pass
class MainClass(AsyncObject):
async def __ainit__(self):
# Do async staff here
pass
async def __adel__(self):
""" This method will be called when object will be closed """
pass
class RelatedClass(AsyncObject):
async def __ainit__(self, parent: MainClass):
link(self, parent)
async def main():
instance = await MyAsyncClass()
print(instance)
main_instance = await MainClass()
related_instance = await RelatedClass(main_instance)
assert not main_instance.is_closed
assert not related_instance.is_closed
await main_instance.close()
assert main_instance.is_closed
# will be closed because linked to closed main_instance
assert related_instance.is_closed
asyncio.run(main())
Async objects might be created when no one event loop has been running.
self.loop
property is lazily evaluated.
Module provides useful abstractions for writing async code.
Objects inherited from AsyncClass
might have their own __init__
method, but it strictly not recommend.
AsyncClass
Is a base wrapper with metaclass has no TaskStore
instance and
additional methods like self.create_task
and self.create_future
.
This class just solves the initialization problem:
.. code:: python :name: test_async_class
import asyncio
from async_class import AsyncClass
class MyAsyncClass(AsyncClass):
async def __ainit__(self):
future = self.loop.create_future()
self.loop.call_soon(future.set_result, True)
await future
async def main():
instance = await MyAsyncClass()
print(instance)
asyncio.run(main())
AsyncObject
Base class with task store instance and helpers for simple task management.
.. code:: python :name: test_async_object
import asyncio
from async_class import AsyncObject
class MyClass(AsyncObject):
async def __ainit__(self):
self.task = self.create_task(asyncio.sleep(3600))
async def main():
obj = await MyClass()
assert not obj.task.done()
await obj.close()
assert obj.task.done()
asyncio.run(main())
TaskStore
TaskStore
is a task management helper. One instance has
create_task()
and create_future()
methods and all created
entities will be destroyed when TaskStore
will be closed via
close()
method.
Also, a task store might create a linked copy of the self, which will be closed when the parent instance will be closed.
.. code:: python :name: test_tasK_store
import asyncio
from async_class import TaskStore
async def main():
store = TaskStore(asyncio.get_event_loop())
task1 = store.create_task(asyncio.sleep(3600))
child_store = store.get_child()
task2 = child_store.create_task(asyncio.sleep(3600))
await store.close()
assert task1.done() and task2.done()
asyncio.run(main())
FAQs
Write classes with async def __ainit__
We found that async-class demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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