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[Mod] 改变Singleton的使用说明

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This commit is contained in:
nanoric 2019-04-11 00:43:46 -04:00
parent 0e67e75d6c
commit 70adba7637
2 changed files with 5 additions and 6 deletions
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4
vnpy/trader/engine.py
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@ -197,13 +197,11 @@ class BaseEngine(ABC):
pass pass
class LogEngine(BaseEngine): class LogEngine(BaseEngine, metaclass=Singleton):
""" """
Processes log event and output with logging module. Processes log event and output with logging module.
""" """
__metaclass__ = Singleton
def __init__(self, main_engine: MainEngine, event_engine: EventEngine): def __init__(self, main_engine: MainEngine, event_engine: EventEngine):
"""""" """"""
super(LogEngine, self).__init__(main_engine, event_engine, "log") super(LogEngine, self).__init__(main_engine, event_engine, "log")

7
vnpy/trader/utility.py
View File

@ -14,10 +14,11 @@ from .object import BarData, TickData
class Singleton(type): class Singleton(type):
""" """
Singleton metaclass, Singleton metaclass,
class A: usage:
__metaclass__ = Singleton class A(metaclass=Singleton):
...
""" """
_instances = {} _instances = {}