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from __future__ import absolute_import, unicode_literals
from kombu.utils.scheduling import FairCycle, cycle_by_name
from kombu.tests.case import Case
class MyEmpty(Exception):
pass
def consume(fun, n):
r = []
for i in range(n):
r.append(fun())
return r
class test_FairCycle(Case):
def test_cycle(self):
resources = ['a', 'b', 'c', 'd', 'e']
def echo(r, timeout=None):
return r
# cycle should be ['a', 'b', 'c', 'd', 'e', ... repeat]
cycle = FairCycle(echo, resources, MyEmpty)
for i in range(len(resources)):
self.assertEqual(cycle.get(), (resources[i],
resources[i]))
for i in range(len(resources)):
self.assertEqual(cycle.get(), (resources[i],
resources[i]))
def test_cycle_breaks(self):
resources = ['a', 'b', 'c', 'd', 'e']
def echo(r):
if r == 'c':
raise MyEmpty(r)
return r
cycle = FairCycle(echo, resources, MyEmpty)
self.assertEqual(
consume(cycle.get, len(resources)),
[('a', 'a'), ('b', 'b'), ('d', 'd'),
('e', 'e'), ('a', 'a')],
)
self.assertEqual(
consume(cycle.get, len(resources)),
[('b', 'b'), ('d', 'd'), ('e', 'e'),
('a', 'a'), ('b', 'b')],
)
cycle2 = FairCycle(echo, ['c', 'c'], MyEmpty)
with self.assertRaises(MyEmpty):
consume(cycle2.get, 3)
def test_cycle_no_resources(self):
cycle = FairCycle(None, [], MyEmpty)
cycle.pos = 10
with self.assertRaises(MyEmpty):
cycle._next()
def test__repr__(self):
self.assertTrue(repr(FairCycle(lambda x: x, [1, 2, 3], MyEmpty)))
class test_round_robin_cycle(Case):
def test_round_robin_cycle(self):
it = cycle_by_name('round_robin')(['A', 'B', 'C'])
self.assertListEqual(it.consume(3), ['A', 'B', 'C'])
it.rotate('B')
self.assertListEqual(it.consume(3), ['A', 'C', 'B'])
it.rotate('A')
self.assertListEqual(it.consume(3), ['C', 'B', 'A'])
it.rotate('A')
self.assertListEqual(it.consume(3), ['C', 'B', 'A'])
it.rotate('C')
self.assertListEqual(it.consume(3), ['B', 'A', 'C'])
class test_priority_cycle(Case):
def test_priority_cycle(self):
it = cycle_by_name('priority')(['A', 'B', 'C'])
self.assertListEqual(it.consume(3), ['A', 'B', 'C'])
it.rotate('B')
self.assertListEqual(it.consume(3), ['A', 'B', 'C'])
it.rotate('A')
self.assertListEqual(it.consume(3), ['A', 'B', 'C'])
it.rotate('A')
self.assertListEqual(it.consume(3), ['A', 'B', 'C'])
it.rotate('C')
self.assertListEqual(it.consume(3), ['A', 'B', 'C'])
class test_sorted_cycle(Case):
def test_sorted_cycle(self):
it = cycle_by_name('sorted')(['B', 'C', 'A'])
self.assertListEqual(it.consume(3), ['A', 'B', 'C'])
it.rotate('B')
self.assertListEqual(it.consume(3), ['A', 'B', 'C'])
it.rotate('A')
self.assertListEqual(it.consume(3), ['A', 'B', 'C'])
it.rotate('A')
self.assertListEqual(it.consume(3), ['A', 'B', 'C'])
it.rotate('C')
self.assertListEqual(it.consume(3), ['A', 'B', 'C'])
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