def start(self):
self._zk.start()
datawatch_next_target = DataWatch(client=self._zk,
path=ZK_NEXT_TARGET,
func=self._on_next_target_changed)
datawatch_current_target = DataWatch(
client=self._zk,
path=ZK_CURRENT_TARGET,
func=self._on_current_target_changed)
def start(self, zkPath):
self._lastNodeList = self._zk.get_children(zkPath)
try:
ChildrenWatch(client=self._zk, path=zkPath, func=self._NodeChange)
DataWatch(client=self._zk, path=zkPath, func=self._DataChange)
# 这里的死循环就是为了不让程序退出，你可以把时间设置长一点观察，其实即便没有到60秒的睡眠时间，如果
# 子节点或者节点数量发生变化也会收到通知。这里的wathch底层就是在节点上设置监听器，然后捕捉事件，如果有
# 事件触发就调用你传递的方法来处理。
while True:
time.sleep(5)
print("OK")
except Exception as err:
print(err.message)
def get_configvalue(self,appkey,configkey,defaultvalue=None,is_watch=False):
'''hight-level DataWatch, return the configvalue of the key'''
configPath = os.path.join(Constants.ZOOKEEPER_ROOT_PATH,appkey,configkey)
if not self.iszktimeout():
if configPath not in self.WatchDict:
# first watch and add it ;will not fire event
if is_watch:
DataWatch(self.zk.client,configPath,self._datawatch_handle)
self.WatchDict[configPath] = True
# if not load conf then init it
if appkey not in self.initAppKeyDict:
self.loadconfig_byappKey_fromzk(appkey)
self.initAppKeyDict[appkey] = True
configvalue = self.localCacheDict[configPath]
return configvalue if configvalue else defaultvalue
def exec(self):
zkc = KazooClient(hosts=self._url, timeout=3)
zkc.start()
print('\npid=%d, zookeeper version: %s' %
(os.getpid(), zkc.server_version()))
try:
self._list_ori = zkc.get_children(self._zk_node)
print('\nattach data and child watch')
# watch func trigger for each change
DataWatch(client=zkc, path=self._zk_node, func=self._data_change)
ChildrenWatch(client=zkc,
path=self._zk_node,
func=self._child_change)
print('\nzk watch is running ...')
time.sleep(6)
finally:
if zkc is not None:
zkc.stop()
def start(self):
self._zk.start()
datawatch_next_target = DataWatch(
client=self._zk,
path=ZK_ASSEMBLER_LAST_BUILT_TARGET,
func=self._on_assembler_last_built_target_changed)
def watcher(self):
try:
DataWatch(client=self.zk, path=self.path, func=self.data_change)
except Exception as e:
print("Create data wather failed: [{}]".format(e))
def OnDataChange(data, stat):
print("ZkNode Version: %s, data: %s" %
(stat.version, data.decode("utf-8")))
if __name__ == '__main__':
client = None
try:
logging.basicConfig()
client = KazooClient(hosts='127.0.0.1:2181')
client.start()
DataWatch(client, "/tfs/tfs_clusters/ht_gpu/11.7.157.11", OnDataChange)
sys.stdin.readline()
client.stop()
sys.exit(0)
except KeyboardInterrupt:
print('Terminated by user.')
if client:
client.stop()
sys.exit(0)
except Exception as ex:
print('Exception: %s' % ex)
if client:
client.stop()