def clear(self):
"""Destroys this object and its content."""
appengine_config.log_appstats_event(
'%s.destroy' % self.__class__.__name__, {})
_instance = self._instances().get(self.__class__)
if _instance:
del self._instances()[self.__class__]
def clear_instance(cls):
"""Destroys the instance of this cls."""
appengine_config.log_appstats_event(
'%s.destroy' % cls.__name__, {})
_instance = cls._instances().get(cls)
if _instance:
del cls._instances()[cls]
def instance(cls, *args, **kwargs):
"""Creates new or returns existing instance of the object."""
# pylint: disable-msg=protected-access
_instance = cls._instances().get(cls)
if not _instance:
try:
_instance = cls(*args, **kwargs)
except:
logging.exception(
'Failed to instantiate %s: %s, %s', cls, args, kwargs)
raise
appengine_config.log_appstats_event('%s.create' % cls.__name__, {})
_instance._init_args = (args, kwargs)
cls._instances()[cls] = _instance
else:
_before = _instance._init_args
_now = (args, kwargs)
if _now != _before:
raise AssertionError(
'Singleton initiated with %s already exists. '
'Failed to re-initialized it with %s.' % (_before, _now))
return _instance
def __init__(self, namespace):
"""Override this method and properly instantiate self.cache."""
self.namespace = namespace
self.cache = None
appengine_config.log_appstats_event(
'%s.connect' % self.__class__.__name__, {'namespace': namespace})
