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#-*- coding:utf-8 -*- | |
import Queue | |
from contextlib import contextmanager | |
class ObjectPool(object): | |
"""A simple object pool with thread safe""" | |
def __init__(self,objectFn,*args,**kwargs): | |
super(ObjectPool, self).__init__() | |
self.objectFn = objectFn | |
self.objectCls = None | |
self._myInit(*args,**kwargs) | |
def __init__(self,objectCls,*args,**kwargs): | |
super(ObjectPool, self).__init__() | |
self.objectCls = objectCls | |
self.objectFn = None | |
self._myInit(*args,**kwargs) | |
def _myInit(self,*args,**kwargs): | |
self.args = args | |
self.maxSize = int(kwargs.get("maxSize",1)) | |
self.queue = Queue.Queue() | |
def _getObj(self): | |
if self.objectFn: | |
return objectFn(self.args) | |
else: | |
return apply(self.objectCls, self.args) | |
def borrowObj(self): | |
if self.queue.qsize()<self.maxSize and self.queue.empty(): | |
self.queue.put(self._getObj()) | |
return self.queue.get() | |
def returnObj(self,obj): | |
self.queue.put(obj) | |
@contextmanager | |
def poolObj(pool): | |
obj = pool.borrowObj() | |
try: | |
yield obj | |
except Exception, e: | |
yield None | |
raise e | |
finally: | |
pool.returnObj(obj) |
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