def test_server_async_callbacks():
button = Button(name='Click')
counts = []
async def cb(event, count=[0]):
import asyncio
count[0] += 1
counts.append(count[0])
await asyncio.sleep(1)
count[0] -= 1
button.on_click(cb)
server = serve(button, port=5008, threaded=True, show=False)
# Wait for server to start
time.sleep(1)
requests.get("http://localhost:5008/")
doc = list(button._models.values())[0][0].document
with set_curdoc(doc):
for _ in range(5):
button.clicks += 1
# Wait for callbacks to be scheduled
time.sleep(2)
# Ensure multiple callbacks started concurrently
try:
assert max(counts) > 1
finally:
server.stop()
def test_server_thread_pool_change_event(threads):
button = Button(name='Click')
button2 = Button(name='Click')
counts = []
def cb(event, count=[0]):
count[0] += 1
counts.append(count[0])
time.sleep(0.5)
count[0] -= 1
button.on_click(cb)
button2.on_click(cb)
layout = Row(button, button2)
port = 6015
serve(layout, port=port, threaded=True, show=False)
# Wait for server to start
time.sleep(1)
requests.get(f"http://localhost:{port}/")
model = list(layout._models.values())[0][0]
doc = model.document
with set_curdoc(doc):
button._server_change(doc, model.ref['id'], None, 'clicks', 0, 1)
button2._server_change(doc, model.ref['id'], None, 'clicks', 0, 1)
# Wait for callbacks to be scheduled
time.sleep(1)
# Checks whether Button on_click callback was executed concurrently
assert max(counts) == 2