def test_replicated_cluster():
"""
Test cluster replication.
"""
replicas = 3
node = SimpleNode()
cluster = ReplicatedCluster((node,), replica_count=replicas)
assert cluster.read_durability == 2
assert cluster.write_durability == 2
cluster.read_durability = 1
assert cluster.read_durability == 1
try:
cluster.read_durability = 0
assert False
except ValueError:
assert True
try:
cluster.read_durability = 100
assert False
except ValueError:
assert True
cluster.read_durability = None
assert cluster.read_durability == quorum(cluster.replica_count)
cluster.write_durability = 0
assert cluster.write_durability == 0
cluster.write_durability = 1
assert cluster.write_durability == 1
try:
cluster.write_durability = 100
assert False
except ValueError:
assert True
cluster.write_durability = None
assert cluster.write_durability == quorum(cluster.replica_count)
cluster['hello'] = 'world'
assert len(node) == replicas
del cluster['hello']
assert len(node) == 0
with cluster(read_durability=replicas):
assert cluster.read_durability == replicas
assert cluster.read_durability == quorum(replicas)
with cluster(write_durability=replicas):
assert cluster.write_durability == replicas
assert cluster.write_durability == quorum(replicas)
def get_write_durability(self):
value = getattr(self, '_write_durability', None)
if value is not None:
return value
else:
return quorum(self.replica_count)
def get_read_durability(self):
return getattr(self, '_read_durability', None) or quorum(self.replica_count)
