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import os
import threading
import unittest
from datetime import timedelta
from time import sleep
import pytest
from reactivex.internal import DisposedException
from reactivex.internal.basic import default_now
from reactivex.scheduler import EventLoopScheduler
CI = os.getenv("CI") is not None
class TestEventLoopScheduler(unittest.TestCase):
def test_event_loop_now(self):
scheduler = EventLoopScheduler()
diff = scheduler.now - default_now()
assert abs(diff) < timedelta(milliseconds=5)
@pytest.mark.skipif(CI, reason="Flaky test in GitHub Actions")
def test_event_loop_now_units(self):
scheduler = EventLoopScheduler()
diff = scheduler.now
sleep(1.1)
diff = scheduler.now - diff
assert timedelta(milliseconds=1000) < diff < timedelta(milliseconds=1300)
def test_event_loop_schedule_action(self):
scheduler = EventLoopScheduler(exit_if_empty=True)
ran = False
gate = threading.Semaphore(0)
def action(scheduler, state):
nonlocal ran
ran = True
gate.release()
scheduler.schedule(action)
gate.acquire()
assert ran is True
# There is no guarantee that the event-loop thread ends before the
# test thread is re-scheduled, give it some time to always run.
sleep(0.1)
assert scheduler._has_thread() is False
def test_event_loop_different_thread(self):
thread_id = None
scheduler = EventLoopScheduler(exit_if_empty=True)
gate = threading.Semaphore(0)
def action(scheduler, state):
nonlocal thread_id
thread_id = threading.current_thread().ident
gate.release()
scheduler.schedule(action)
gate.acquire()
# There is no guarantee that the event-loop thread ends before the
# test thread is re-scheduled, give it some time to always run.
sleep(0.1)
assert thread_id != threading.current_thread().ident
assert scheduler._has_thread() is False
def test_event_loop_schedule_ordered_actions(self):
scheduler = EventLoopScheduler(exit_if_empty=True)
gate = threading.Semaphore(0)
result = []
scheduler.schedule(lambda s, t: result.append(1))
def action(scheduler, state):
result.append(2)
gate.release()
scheduler.schedule(action)
gate.acquire()
# There is no guarantee that the event-loop thread ends before the
# test thread is re-scheduled, give it some time to always run.
sleep(0.1)
assert result == [1, 2]
assert scheduler._has_thread() is False
def test_event_loop_schedule_ordered_actions_due(self):
scheduler = EventLoopScheduler(exit_if_empty=True)
gate = threading.Semaphore(0)
result = []
def action(scheduler, state):
result.append(3)
gate.release()
scheduler.schedule_relative(0.4, action)
scheduler.schedule_relative(0.2, lambda s, t: result.append(2))
scheduler.schedule(lambda s, t: result.append(1))
gate.acquire()
# There is no guarantee that the event-loop thread ends before the
# test thread is re-scheduled, give it some time to always run.
sleep(0.1)
assert result == [1, 2, 3]
assert scheduler._has_thread() is False
def test_event_loop_schedule_ordered_actions_due_mixed(self):
scheduler = EventLoopScheduler(exit_if_empty=True)
gate = threading.Semaphore(0)
result = []
def action(scheduler, state):
result.append(1)
scheduler.schedule_relative(0.2, action3)
scheduler.schedule(action2)
def action2(scheduler, state):
result.append(2)
def action3(scheduler, state):
result.append(3)
gate.release()
scheduler.schedule(action)
gate.acquire()
# There is no guarantee that the event-loop thread ends before the
# test thread is re-scheduled, give it some time to always run.
sleep(0.1)
assert result == [1, 2, 3]
assert scheduler._has_thread() is False
def test_event_loop_schedule_action_relative_due(self):
scheduler = EventLoopScheduler(exit_if_empty=True)
gate = threading.Semaphore(0)
starttime = default_now()
endtime = None
def action(scheduler, state):
nonlocal endtime
endtime = default_now()
gate.release()
scheduler.schedule_relative(timedelta(milliseconds=200), action)
gate.acquire()
# There is no guarantee that the event-loop thread ends before the
# test thread is re-scheduled, give it some time to always run.
sleep(0.1)
diff = endtime - starttime
assert diff > timedelta(milliseconds=180)
assert scheduler._has_thread() is False
def test_event_loop_schedule_action_absolute_due(self):
scheduler = EventLoopScheduler(exit_if_empty=True)
gate = threading.Semaphore(0)
starttime = default_now()
endtime = None
def action(scheduler, state):
nonlocal endtime
endtime = default_now()
gate.release()
scheduler.schedule_absolute(scheduler.now, action)
gate.acquire()
# There is no guarantee that the event-loop thread ends before the
# test thread is re-scheduled, give it some time to always run.
sleep(0.1)
diff = endtime - starttime
assert diff < timedelta(milliseconds=180)
assert scheduler._has_thread() is False
def test_eventloop_schedule_action_periodic(self):
scheduler = EventLoopScheduler(exit_if_empty=False)
gate = threading.Semaphore(0)
period = 0.05
counter = 3
def action(state):
nonlocal counter
if state:
counter -= 1
return state - 1
if counter == 0:
gate.release()
disp = scheduler.schedule_periodic(period, action, counter)
def dispose(scheduler, state):
disp.dispose()
gate.release()
gate.acquire()
assert counter == 0
assert scheduler._has_thread() is True
scheduler.schedule(dispose)
gate.acquire()
assert scheduler._has_thread() is True
sleep(period)
scheduler.dispose()
sleep(period)
assert scheduler._has_thread() is False
def test_eventloop_schedule_dispose(self):
scheduler = EventLoopScheduler(exit_if_empty=False)
scheduler.dispose()
ran = False
def action(scheduler, state):
nonlocal ran
ran = True
with pytest.raises(DisposedException):
scheduler.schedule(action)
assert ran is False
assert scheduler._has_thread() is False
def test_eventloop_schedule_absolute_dispose(self):
scheduler = EventLoopScheduler(exit_if_empty=False)
scheduler.dispose()
ran = False
def action(scheduler, state):
nonlocal ran
ran = True
with pytest.raises(DisposedException):
scheduler.schedule_absolute(scheduler.now, action)
assert ran is False
assert scheduler._has_thread() is False
def test_eventloop_schedule_periodic_dispose_error(self):
scheduler = EventLoopScheduler(exit_if_empty=False)
scheduler.dispose()
ran = False
def action(scheduler, state):
nonlocal ran
ran = True
with pytest.raises(DisposedException):
scheduler.schedule_periodic(0.1, action)
assert ran is False
assert scheduler._has_thread() is False
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