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- """
- kombu.transport.virtual.scheduling
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
- Consumer utilities.
-
- """
- from __future__ import absolute_import
-
- from itertools import count
-
-
- class FairCycle(object):
- """Consume from a set of resources, where each resource gets
- an equal chance to be consumed from."""
-
- def __init__(self, fun, resources, predicate=Exception):
- self.fun = fun
- self.resources = resources
- self.predicate = predicate
- self.pos = 0
-
- def _next(self):
- while 1:
- try:
- resource = self.resources[self.pos]
- self.pos += 1
- return resource
- except IndexError:
- self.pos = 0
- if not self.resources:
- raise self.predicate()
-
- def get(self, **kwargs):
- for tried in count(0): # for infinity
- resource = self._next()
-
- try:
- return self.fun(resource, **kwargs), resource
- except self.predicate:
- if tried >= len(self.resources) - 1:
- raise
-
- def close(self):
- pass
-
- def __repr__(self):
- return '<FairCycle: {self.pos}/{size} {self.resources}>'.format(
- self=self, size=len(self.resources))
|
