From 1d6506c5f3a57b37e30351c7b7e414351a54c867 Mon Sep 17 00:00:00 2001
From: "vn.py" <xiaoyou.chen@foxmail.com>
Date: Thu, 11 Apr 2019 16:54:43 +0800
Subject: [PATCH] [Del]remove Singleton

---
 vnpy/trader/engine.py  |  4 ++--
 vnpy/trader/utility.py | 19 -------------------
 2 files changed, 2 insertions(+), 21 deletions(-)

diff --git a/vnpy/trader/engine.py b/vnpy/trader/engine.py
index af136dab..2d4a98e0 100644
--- a/vnpy/trader/engine.py
+++ b/vnpy/trader/engine.py
@@ -24,7 +24,7 @@ from .event import (
 from .gateway import BaseGateway
 from .object import CancelRequest, LogData, OrderRequest, SubscribeRequest
 from .setting import SETTINGS
-from .utility import Singleton, get_folder_path
+from .utility import get_folder_path
 
 
 class MainEngine:
@@ -197,7 +197,7 @@ class BaseEngine(ABC):
         pass
 
 
-class LogEngine(BaseEngine, metaclass=Singleton):
+class LogEngine(BaseEngine):
     """
     Processes log event and output with logging module.
     """
diff --git a/vnpy/trader/utility.py b/vnpy/trader/utility.py
index 6f023259..1f40aa77 100644
--- a/vnpy/trader/utility.py
+++ b/vnpy/trader/utility.py
@@ -12,25 +12,6 @@ import talib
 from .object import BarData, TickData
 
 
-class Singleton(type):
-    """
-    Singleton metaclass,
-
-    usage:
-    class A(metaclass=Singleton):
-        ...
-    """
-    _instances = {}
-
-    def __call__(cls, *args, **kwargs):
-        """"""
-        if cls not in cls._instances:
-            cls._instances[cls] = super(Singleton, cls).__call__(
-                *args, **kwargs
-            )
-        return cls._instances[cls]
-
-
 def _get_trader_dir(temp_name: str):
     """
     Get path where trader is running in.