ÿØÿàJFIFÿþ ÿÛC       ÿÛC ÿÀÿÄÿÄ"#QrÿÄÿÄ&1!A"2qQaáÿÚ ?Øy,æ/3JæݹÈ߲؋5êXw²±ÉyˆR”¾I0ó2—PI¾IÌÚiMö¯–þrìN&"KgX:Šíµ•nTJnLK„…@!‰-ý ùúmë;ºgµŒ&ó±hw’¯Õ@”Ü— 9ñ-ë.²1<yà‚¹ïQÐU„ہ?.’¦èûbß±©Ö«Âw*VŒ) `$‰bØԟ’ëXÖ-ËTÜíGÚ3ð«g Ÿ§¯—Jx„–’U/ÂÅv_s(Hÿ@TñJÑãõçn­‚!ÈgfbÓc­:él[ðQe 9ÀPLbÃãCµm[5¿ç'ªjglå‡Ûí_§Úõl-;"PkÞÞÁQâ¼_Ñ^¢SŸx?"¸¦ùY騐ÒOÈ q’`~~ÚtËU¹CڒêV  I1Áß_ÿÙfrom __future__ import absolute_import from threading import local class TransactionContext(object): def __init__(self, stack, context): self.stack = stack self.context = context def __enter__(self): self.stack.push(self.context) return self def __exit__(self, *exc_info): self.stack.pop(self.context) class TransactionStack(local): def __init__(self): self.stack = [] def __len__(self): return len(self.stack) def __iter__(self): return iter(self.stack) def __call__(self, context): return TransactionContext(self, context) def clear(self): self.stack = [] def peek(self): try: return self.stack[-1] except IndexError: return None def push(self, context): self.stack.append(context) return context def pop(self, context=None): if context is None: return self.stack.pop() while self.stack: if self.stack.pop() is context: return context