133 lines
4 KiB
Python
133 lines
4 KiB
Python
from quorums import *
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from quorums.quorum_system import *
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import unittest
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class TestQuorumSystem(unittest.TestCase):
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def test_init(self):
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def quorums(e: Expr['str']) -> FrozenSet[FrozenSet[str]]:
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return frozenset(frozenset(q) for q in e.quorums())
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def assert_equal(x: Expr['str'], y: Expr['str']) -> None:
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self.assertEqual(quorums(x), quorums(y))
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a = Node('a')
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b = Node('b')
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c = Node('c')
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d = Node('d')
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# Specify reads.
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qs = QuorumSystem(reads = a + b)
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assert_equal(qs.reads, a + b)
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assert_equal(qs.writes, a * b)
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# Specify writes.
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qs = QuorumSystem(writes = a + b)
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assert_equal(qs.reads, a * b)
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assert_equal(qs.writes, a + b)
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# Specify neither.
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with self.assertRaises(ValueError):
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QuorumSystem()
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# Specify both overlapping.
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qs = QuorumSystem(reads=a+b, writes=a*b*c)
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assert_equal(qs.reads, a+b)
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assert_equal(qs.writes, a*b*c)
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# Specify both not overlapping.
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with self.assertRaises(ValueError):
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QuorumSystem(reads=a+b, writes=a)
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def test_uniform_strategy(self):
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a = Node('a')
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b = Node('b')
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c = Node('c')
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d = Node('d')
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sigma = QuorumSystem(reads=a).uniform_strategy()
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self.assertEqual(sigma.sigma_r, {
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frozenset({'a'}): 1.0,
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})
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self.assertEqual(sigma.sigma_w, {
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frozenset({'a'}): 1.0,
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})
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sigma = QuorumSystem(reads=a+a).uniform_strategy()
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self.assertEqual(sigma.sigma_r, {
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frozenset({'a'}): 1.0,
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})
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self.assertEqual(sigma.sigma_w, {
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frozenset({'a'}): 1.0,
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})
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sigma = QuorumSystem(reads=a*a).uniform_strategy()
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self.assertEqual(sigma.sigma_r, {
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frozenset({'a'}): 1.0,
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})
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self.assertEqual(sigma.sigma_w, {
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frozenset({'a'}): 1.0,
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})
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sigma = QuorumSystem(reads=a + a*b).uniform_strategy()
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self.assertEqual(sigma.sigma_r, {
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frozenset({'a'}): 1.0,
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})
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self.assertEqual(sigma.sigma_w, {
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frozenset({'a'}): 1.0,
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})
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sigma = QuorumSystem(reads=a + a*b + a*c).uniform_strategy()
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self.assertEqual(sigma.sigma_r, {
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frozenset({'a'}): 1.0,
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})
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self.assertEqual(sigma.sigma_w, {
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frozenset({'a'}): 1.0,
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})
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sigma = QuorumSystem(reads=a + b).uniform_strategy()
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self.assertEqual(sigma.sigma_r, {
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frozenset({'a'}): 1 / 2,
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frozenset({'b'}): 1 / 2,
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})
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self.assertEqual(sigma.sigma_w, {
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frozenset({'a', 'b'}): 1.0,
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})
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sigma = QuorumSystem(reads=a + b + c).uniform_strategy()
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self.assertEqual(sigma.sigma_r, {
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frozenset({'a'}): 1 / 3,
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frozenset({'b'}): 1 / 3,
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frozenset({'c'}): 1 / 3,
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})
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self.assertEqual(sigma.sigma_w, {
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frozenset({'a', 'b', 'c'}): 1.0,
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})
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sigma = QuorumSystem(reads=(a*b)+(c*d)).uniform_strategy()
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self.assertEqual(sigma.sigma_r, {
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frozenset({'a', 'b'}): 1 / 2,
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frozenset({'c', 'd'}): 1 / 2,
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})
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self.assertEqual(sigma.sigma_w, {
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frozenset({'a', 'c'}): 1 / 4,
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frozenset({'a', 'd'}): 1 / 4,
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frozenset({'b', 'c'}): 1 / 4,
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frozenset({'b', 'd'}): 1 / 4,
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})
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sigma = QuorumSystem(reads=(a*b)+(c*d)+(a*b)+(a*b*c)).uniform_strategy()
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self.assertEqual(sigma.sigma_r, {
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frozenset({'a', 'b'}): 1 / 2,
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frozenset({'c', 'd'}): 1 / 2,
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})
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self.assertEqual(sigma.sigma_w, {
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frozenset({'a', 'c'}): 1 / 4,
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frozenset({'a', 'd'}): 1 / 4,
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frozenset({'b', 'c'}): 1 / 4,
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frozenset({'b', 'd'}): 1 / 4,
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})
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def test_optimal_strategy(self):
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# TODO(mwhittaker): Implement.
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pass
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