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enhance: add SingleInstanceMetaClass to inherit from a generic type #2176

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enhance: add SingleInstanceMetaClass to inherit from a generic type #2176

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8 changes: 5 additions & 3 deletions pymilvus/orm/connections.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@
import pathlib
import threading
import time
from typing import Callable, Tuple, Union
from typing import Callable, Generic, Tuple, TypeVar, Union
from urllib import parse

from pymilvus.client.check import is_legal_address, is_legal_host, is_legal_port
Expand All @@ -31,6 +31,8 @@

VIRTUAL_PORT = 443

T = TypeVar("T")


def synchronized(func: Callable):
"""
Expand All @@ -45,13 +47,13 @@ def lock_func(*args, **kwargs):
return lock_func


class SingleInstanceMetaClass(type):
class SingleInstanceMetaClass(Generic[T]):
instance = None

def __init__(cls, *args, **kwargs) -> None:
super().__init__(*args, **kwargs)

def __call__(cls, *args, **kwargs):
def __call__(cls, *args, **kwargs) -> T:
if cls.instance:
return cls.instance
cls.instance = cls.__new__(cls)
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