本文整理汇总了Python中py4j.java_gateway.JavaGateway.isAlive方法的典型用法代码示例。如果您正苦于以下问题：Python JavaGateway.isAlive方法的具体用法？Python JavaGateway.isAlive怎么用？Python JavaGateway.isAlive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py4j.java_gateway.JavaGateway的用法示例。
在下文中一共展示了JavaGateway.isAlive方法的1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: Gateway
# 需要导入模块: from py4j.java_gateway import JavaGateway [as 别名]
# 或者: from py4j.java_gateway.JavaGateway import isAlive [as 别名]
class Gateway(object):
_gateways = {}
_gateway_lock = RLock()
def __new__(cls, bootstrap_urls):
bootstrap_urls = tuple(sorted(bootstrap_urls))
result = cls._gateways.get(bootstrap_urls)
if result is None:
with cls._gateway_lock:
result = cls._gateways.get(bootstrap_urls)
if result is None:
result = cls._gateways[bootstrap_urls] = object.__new__(cls, bootstrap_urls)
return result
__slots__ = ('gateway_port', 'process', 'gateway', 'client', 'is_running', 'is_connected', 'output_process_thread', 'bootstrap_urls')
def _cleanup(self):
if self.process is not None:
logger.debug("Closing gateway connection to %d", getattr(self, 'gateway_port', '?'))
if self.client is not None:
try:
self.client.close()
except Exception as ex:
logger.debug("Error while closing gateway client: %s", getattr(ex, 'message', '') or str(ex))
if self.gateway is not None:
self.gateway.shutdown()
if self.process is not None:
try:
self.process.terminate()
self.process.wait()
except OSError:
pass # process already gone
self.is_connected = self.is_running = False
self.gateway_port = self.client = self.process = self.gateway = None
def _establish_connection(self, bootstrap_urls):
from . import JAVA_OPTS
self.bootstrap_urls = bootstrap_urls
self.gateway_port = self.client = self.process = self.gateway = None
for _ in xrange(3):
self._cleanup()
logger.debug("Trying to create Py4J gateway")
self.process = Popen(['java', '-cp', _jar_file] + JAVA_OPTS.split() + ['com.mojn.VoldemortPython'] + [ 'tcp://' + u for u in bootstrap_urls ],
bufsize=1, preexec_fn=_preexec,
stdout=PIPE, stderr=STDOUT)
self.is_running = False
self.output_process_thread = Thread(target=self._log_stdout, args=('Voldemort-at-' + '/'.join(bootstrap_urls), self.process))
self.output_process_thread.daemon = True
self.output_process_thread.start()
logger.debug("Process created")
for attempt in xrange(5):
if self.is_running:
break
elif attempt < 4:
time.sleep(2**attempt)
if not self.is_running:
logger.debug("JVM never started running")
continue
for attempt in xrange(5):
if self.gateway_port:
break
elif attempt < 4:
time.sleep(2**attempt)
if not self.gateway_port:
logger.debug("JVM never emitted a port number on stdout")
continue
logger.debug("Gateway up - trying to connect")
for attempt in xrange(5):
try:
self.client = _RetryOnceGatewayClient(port=self.gateway_port)
self.gateway = JavaGateway(self.client, auto_convert=False)
break
except Exception: # pylint: disable=W0703
if attempt < 4:
time.sleep(2**attempt)
if self.gateway is None:
logger.debug('Could not connect to java gateway server at port %d', self.gateway_port)
continue
logger.debug("Connected to JVM - testing gateway initialization")
for attempt in xrange(5):
try:
if self.gateway.isAlive():
self.is_connected = True
break
except Exception: # pylint: disable=W0703
if attempt < 4:
time.sleep(2**attempt)
if self.is_connected:
break
if not self.is_connected:
self._cleanup()
raise IOError('Could not establish java gateway server after trying three times')
def __init__(self, bootstrap_urls):
with self._gateway_lock:
if not getattr(self, 'is_connected', False):
self._establish_connection(bootstrap_urls)
def __getattr__(self, attribute_name):
#.........这里部分代码省略.........