BTW, below is a version of my code from yesterday that works on class
methods. I didn't write the __get__ code, but took it from a decorator
tutorial on the web.
This version works with standalone functions, and with class methods that
also use @inlineCallbacks. So you can do
class MyClass(object):
@DeferredPooler
@defer.inlineCallbacks
def xxx(self, ...):
d = funcReturningADeferred()
d.addCallbacks(...)
yield d
and it works. I also wrote a small test suite in case anyone wants it.
There are still some issues (e.g., with timeouts), but I've decorated some
methods with DeferredPooler and am happy with the result so far.
Terry
from twisted.internet import defer
from twisted.python import failure
class DeferredPooler(object):
def __init__(self, func):
self.pool = {}
self.func = func
def _callOthers(self, result, key):
if isinstance(result, failure.Failure):
for d in self.pool[key]:
d.errback(result)
else:
for d in self.pool[key]:
d.callback(result)
del self.pool[key]
return result
def __call__(self, *args, **kwargs):
key = (args, hash(tuple(sorted(kwargs.items()))))
if key in self.pool:
d = defer.Deferred()
self.pool[key].append(d)
return d
else:
self.pool[key] = []
d = self.func(*args, **kwargs)
assert isinstance(d, defer.Deferred)
d.addBoth(self._callOthers, key)
return d
def __get__(self, obj, type=None):
if obj is None:
return self
new_func = self.func.__get__(obj, type)
return self.__class__(new_func)
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