def test_longer_random_sequence_of_queue_ops():
"""A long random sequence of added and retrieved values"""
q = RandomShufflingBuffer(100, 80)
for _ in six.moves.xrange(10000):
if q.can_add():
q.add_many(np.random.random((np.random.randint(1, 10),)))
assert q.size < 100 + 10
for _ in range(np.random.randint(1, 10)):
if not q.can_retrieve():
break
# Make sure never get to less than `min_after_retrieve` elements
assert 80 <= q.size
q.retrieve()
def test_random_shuffling_buffer_can_add_retrieve_flags():
"""Check can_add/can_retrieve flags at all possible states"""
q = RandomShufflingBuffer(5, 3)
# Empty buffer. Can start adding, nothing to retrieve yet
assert q.size == 0
assert q.can_add()
assert not q.can_retrieve()
# Under min_after_retrieve elements, so can not retrieve just yet
q.add_many([1, 2])
assert q.can_add()
assert not q.can_retrieve()
assert q.size == 2
# Got to min_after_retrieve elements, can start retrieving
q.add_many([3])
assert q.can_retrieve()
assert q.size == 3
# But when we retrieve we are again under min_after_retrieve, so can not retrieve again
q.retrieve()
assert not q.can_retrieve()
assert q.size == 2
# Getting back to the retrievable state with enough items in the buffer
q.add_many([4, 5])
assert q.can_add()
assert q.can_retrieve()
assert q.size == 4
# Can overrun the capacity (as long as below extra_capacity), but can not add if we are above
# shuffling_buffer_capacity
q.add_many([6, 7, 8, 9])
assert not q.can_add()
assert q.can_retrieve()
assert q.size == 8
# Getting one out. Still have more than shuffling_buffer_capacity
q.retrieve()
assert not q.can_add()
assert q.can_retrieve()
assert q.size == 7
# Retrieve enough to get back to addable state
[q.retrieve() for _ in range(4)]
assert q.can_add()
assert q.can_retrieve()
assert q.size == 3
# Retrieve the last element so we go under min_after_retrieve and can not retrieve any more
q.retrieve()
assert q.can_add()
assert not q.can_retrieve()
with pytest.raises(RuntimeError):
q.retrieve()
assert q.size == 2
# finish() will allow us to deplete the buffer completely
q.finish()
assert not q.can_add()
assert q.can_retrieve()
assert q.size == 2
q.retrieve()
assert not q.can_add()
assert q.can_retrieve()
assert q.size == 1
q.retrieve()
assert not q.can_add()
assert not q.can_retrieve()
assert q.size == 0
