def acquire(self, access_mode=None, timeout=None, database=None):
if access_mode not in (WRITE_ACCESS, READ_ACCESS):
raise ClientError(
"Non valid 'access_mode'; {}".format(access_mode))
if not timeout:
raise ClientError(
"'timeout' must be a float larger than 0; {}".format(timeout))
from neo4j.api import check_access_mode
access_mode = check_access_mode(access_mode)
while True:
try:
# Get an address for a connection that have the fewest in-use connections.
address = self._select_address(access_mode=access_mode,
database=database)
log.debug(
"[#0000] C: <ACQUIRE ADDRESS> database=%r address=%r",
database, address)
except (ReadServiceUnavailable, WriteServiceUnavailable) as err:
raise SessionExpired(
"Failed to obtain connection towards '%s' server." %
access_mode) from err
try:
connection = self._acquire(
address,
timeout=timeout) # should always be a resolved address
except ServiceUnavailable:
self.deactivate(address=address)
else:
return connection
def acquire(self, access_mode=None, timeout=None):
from neo4j.api import check_access_mode
access_mode = check_access_mode(access_mode)
while True:
try:
address = self._select_address(access_mode)
except (ReadServiceUnavailable, WriteServiceUnavailable) as err:
raise SessionExpired("Failed to obtain connection towards '%s' server." % access_mode) from err
try:
connection = self._acquire(address, timeout=timeout) # should always be a resolved address
except ServiceUnavailable:
self.deactivate(address)
else:
return connection
def acquire(self, *, access_mode, timeout, database):
from neo4j.api import check_access_mode
access_mode = check_access_mode(access_mode)
while True:
try:
# Get an address for a connection that have the fewest in-use connections.
address = self._select_address(access_mode=access_mode, database=database)
log.debug("[#0000] C: <ACQUIRE ADDRESS> database=%r address=%r", database, address)
except (ReadServiceUnavailable, WriteServiceUnavailable) as err:
raise SessionExpired("Failed to obtain connection towards '%s' server." % access_mode) from err
try:
connection = self._acquire(address, timeout=timeout) # should always be a resolved address
except ServiceUnavailable:
self.deactivate(address=address)
else:
return connection