我阅读了kazoo的文档。 然后我在网站上运行了代码示例,每次运行时都会调用一次func for watch,我想阻止程序直到删除一个节点的子节点,我该怎么做?
当前代码:
#!/usr/bin/env python3
from kazoo.client import KazooClient
zk = KazooClient(hosts='127.0.0.1:2181')
zk.start()
@zk.ChildrenWatch("/distribute-lock")
def watch_children(children):
print("Children are now: %s" % children)
children = zk.exists("/distribute-lock/childnode-325", watch=watch_children)
print(children)
zk.stop()
答案 0 :(得分:2)
您可以使用threading.Lock
来实现此要求;它会阻塞程序,直到子节点/ distribute-lock删除或添加为止。
代码:
#!/usr/bin/env python3
from kazoo.client import KazooClient
from threading import Lock
zkl = Lock()
def my_func(event):
if event.type == 'CHILD':
zkl.release()
zk = KazooClient(hosts='127.0.0.1:2181')
zk.start()
zkl.acquire()
children = zk.get_children("/distribute-lock", watch=my_func)
zkl.acquire()
zk.stop()