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import asyncio
import time
import pytest
from async_property import async_cached_property, AwaitLoader
pytestmark = pytest.mark.asyncio
class MyModel(AwaitLoader):
def __init__(self):
self.num_loaded = 0
@async_cached_property
async def first(self):
await asyncio.sleep(0.1)
self.num_loaded += 1
@async_cached_property
async def second(self):
await asyncio.sleep(0.2)
self.num_loaded += 1
@async_cached_property
async def third(self):
await asyncio.sleep(0.3)
self.num_loaded += 1
async def test_is_locking():
start = time.time()
instance = MyModel()
await asyncio.gather(instance.first, instance.first, instance.first)
duration = time.time() - start
assert instance.num_loaded == 1
assert 0.1 <= duration < 0.15
async def test_lock_multiple_instances():
start = time.time()
instance_one = MyModel()
instance_two = MyModel()
await asyncio.gather(instance_one.first, instance_two.first)
duration = time.time() - start
assert 0.1 <= duration < 0.15
async def test_concurrent():
start = time.time()
instance = MyModel()
await asyncio.gather(instance.first, instance.second, instance.third,
instance.first, instance.second, instance.third)
duration = time.time() - start
assert instance.num_loaded == 3
assert 0.3 <= duration < 0.4
async def test_await_concurrent():
start = time.time()
instance = await MyModel()
duration = time.time() - start
assert instance.num_loaded == 3
assert 0.3 <= duration < 0.4
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