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- from __future__ import absolute_import
- from kombu.transport.virtual.scheduling import FairCycle
- 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)))
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