Returns a generator of available ICachableItem in the ICachableSource

def items(self):
        """Returns a generator of available ICachableItem in the ICachableSource
        """
        for dictreader in self._csv_dictreader_list:
            for entry in dictreader:
                item = self.factory()
                item.key = self.key()
                item.attributes = entry
                try:
                    item.validate()
                except Exception as e:
                    logger.debug("skipping entry due to item validation exception: %s", str(e))
                    continue
                logger.debug("found validated item in CSV source, key: %s", str(item.attributes[self.key()]))
                yield item