[ZODB-Dev] Automating retry management

[Nitro]

Am 11.05.2010, 16:01 Uhr, schrieb Jim Fulton <jim at zope.com>:

> This wouldn't work.  You would need to re-execute the suite
> for each retry. It's not enough to just keep committing the same
> transaction. (There are other details wrong with the code above,
> but they are fixable.)  Python doesn't provide a way to keep
> executing the suite.

You are right.

The only thing I could come up with was something like below, using a  
decorator instead of a context.

-Matthias

@doTransaction(count = 5)
def storeData():
    ... store data here ...

def doTransaction(transaction = None, count = 3):
     def decorator(func):
         def do():
             for i in range(1+count):
                 try:
                     func()
                 except:
                     transaction.abort()
                     raise
                 try:
                     transaction.commit()
                 except ConflictError:
                     if i == count:
                         raise
                 else:
                     return
         return do
     return decorator