On Thu, Aug 26, 2010 at 12:23 PM, Sergey Magafurov <smagafu...@naumen.ru> wrote:
> I ask this question because I am confusing with this ugly slice of code:
>
> try:
> ...
> except:
> item.release()
> raise
If you don't like that construct, perhaps this one is nicer:
from twisted.internet.defer import maybeDeferred
def getCachedResult(cache, key):
def _readItem(item):
if item.obsolete():
return None
return item.read()
def _gotResult(item):
def _release(ign):
item.release()
return item
d = maybeDeferred(_readItem, item)
d.addBoth(_release)
d.addCallback(renew)
return d
def _ebNotFound(f):
f.trap(NotFound)
return None
return cache.open(key).addCallbacks(_gotResult, _ebNotFound)
--
mithrandi, i Ainil en-Balandor, a faer Ambar
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