def test_obtain_release_lock(self):
if not CONFIG.is_pg:
return
da0 = get_data_access().open()
da1 = get_data_access().open()
key = 1
# Get lock with first connection
self.assertTrue(obtain_lock(da0, key, LockMode.skip))
# Try to get lock with second connection, fails
self.assertFalse(obtain_lock(da1, key, LockMode.skip))
# Try to release lock with second connection, fails
self.assertFalse(release_lock(da1, key))
# Release lock wth first connection
self.assertTrue(release_lock(da0, key))
# Get lock with second connection
self.assertTrue(obtain_lock(da1, key, LockMode.skip))
# Release lock with second connection
self.assertTrue(release_lock(da1, key))
def _get_next_job(self):
"""Returns a 2-tuple of (job, serialization_key) for the highest priority
waiting job that has an open serialization key. Returns (None, None) if
no such job exists.
"""
if not self._cooperative:
return self._get_next_job_inner()
else:
if self._cooperative.mode == Cooperative.none:
return self._get_next_job_inner()
elif self._cooperative.mode == Cooperative.advisory_lock:
adv.obtain_lock(self._model_access, self._cooperative.args, xact=True)
return self._get_next_job_inner()
elif self._cooperative.mode == Cooperative.row_lock:
return self._get_next_job_inner(row_lock=True)