From 84e6eb277fa30f385b8b77476d13e5859f12bc47 Mon Sep 17 00:00:00 2001
From: "vn.py" <vn.py@foxmail.com>
Date: Wed, 18 Oct 2017 10:38:41 +0800
Subject: [PATCH] =?UTF-8?q?[Mod]Close=20#540=EF=BC=8C=E5=AE=9E=E7=8E=B0Log?=
 =?UTF-8?q?Engine=E7=9A=84=E5=8D=95=E4=BE=8B=E6=A8=A1=E5=BC=8F?=
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---
 vnpy/trader/vtEngine.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/vnpy/trader/vtEngine.py b/vnpy/trader/vtEngine.py
index 495cc435..598e8bb1 100644
--- a/vnpy/trader/vtEngine.py
+++ b/vnpy/trader/vtEngine.py
@@ -518,6 +518,16 @@ class LogEngine(object):
     LEVEL_WARN = logging.WARN
     LEVEL_ERROR = logging.ERROR
     LEVEL_CRITICAL = logging.CRITICAL
+    
+    # 单例对象
+    instance = None
+    
+    #----------------------------------------------------------------------
+    def __new__(cls, *args, **kwargs):
+        """创建对象，保证单例"""
+        if not cls.instance:
+            cls.instance = super(LogEngine, cls).__new__(cls, *args, **kwargs)
+        return cls.instance
 
     #----------------------------------------------------------------------
     def __init__(self):