本文整理汇总了Python中cassandra.policies.DCAwareRoundRobinPolicy.on_add方法的典型用法代码示例。如果您正苦于以下问题：Python DCAwareRoundRobinPolicy.on_add方法的具体用法？Python DCAwareRoundRobinPolicy.on_add怎么用？Python DCAwareRoundRobinPolicy.on_add使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类cassandra.policies.DCAwareRoundRobinPolicy的用法示例。
在下文中一共展示了DCAwareRoundRobinPolicy.on_add方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: test_status_updates
# 需要导入模块: from cassandra.policies import DCAwareRoundRobinPolicy [as 别名]
# 或者: from cassandra.policies.DCAwareRoundRobinPolicy import on_add [as 别名]
def test_status_updates(self):
hosts = [Host(i, SimpleConvictionPolicy) for i in range(4)]
for h in hosts[:2]:
h.set_location_info("dc1", "rack1")
for h in hosts[2:]:
h.set_location_info("dc2", "rack1")
policy = DCAwareRoundRobinPolicy("dc1", used_hosts_per_remote_dc=1)
policy.populate(None, hosts)
policy.on_down(hosts[0])
policy.on_remove(hosts[2])
new_local_host = Host(4, SimpleConvictionPolicy)
new_local_host.set_location_info("dc1", "rack1")
policy.on_up(new_local_host)
new_remote_host = Host(5, SimpleConvictionPolicy)
new_remote_host.set_location_info("dc9000", "rack1")
policy.on_add(new_remote_host)
# we now have two local hosts and two remote hosts in separate dcs
qplan = list(policy.make_query_plan())
self.assertEqual(set(qplan[:2]), set([hosts[1], new_local_host]))
self.assertEqual(set(qplan[2:]), set([hosts[3], new_remote_host]))
# since we have hosts in dc9000, the distance shouldn't be IGNORED
self.assertEqual(policy.distance(new_remote_host), HostDistance.REMOTE)示例2: test_default_dc
# 需要导入模块: from cassandra.policies import DCAwareRoundRobinPolicy [as 别名]
# 或者: from cassandra.policies.DCAwareRoundRobinPolicy import on_add [as 别名]
def test_default_dc(self):
host_local = Host(1, SimpleConvictionPolicy, 'local')
host_remote = Host(2, SimpleConvictionPolicy, 'remote')
host_none = Host(1, SimpleConvictionPolicy)
# contact point is '1'
cluster = Mock(contact_points=[1])
# contact DC first
policy = DCAwareRoundRobinPolicy()
policy.populate(cluster, [host_none])
self.assertFalse(policy.local_dc)
policy.on_add(host_local)
policy.on_add(host_remote)
self.assertNotEqual(policy.local_dc, host_remote.datacenter)
self.assertEqual(policy.local_dc, host_local.datacenter)
# contact DC second
policy = DCAwareRoundRobinPolicy()
policy.populate(cluster, [host_none])
self.assertFalse(policy.local_dc)
policy.on_add(host_remote)
policy.on_add(host_local)
self.assertNotEqual(policy.local_dc, host_remote.datacenter)
self.assertEqual(policy.local_dc, host_local.datacenter)
# no DC
policy = DCAwareRoundRobinPolicy()
policy.populate(cluster, [host_none])
self.assertFalse(policy.local_dc)
policy.on_add(host_none)
self.assertFalse(policy.local_dc)
# only other DC
policy = DCAwareRoundRobinPolicy()
policy.populate(cluster, [host_none])
self.assertFalse(policy.local_dc)
policy.on_add(host_remote)
self.assertFalse(policy.local_dc)