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- __all__ = ('pre_init', 'post_init', 'pre_save', 'pre_save_post_validation',
- 'post_save', 'pre_delete', 'post_delete')
- signals_available = False
- try:
- from blinker import Namespace
- signals_available = True
- except ImportError:
- class Namespace(object):
- def signal(self, name, doc=None):
- return _FakeSignal(name, doc)
- class _FakeSignal(object):
- """If blinker is unavailable, create a fake class with the same
- interface that allows sending of signals but will fail with an
- error on anything else. Instead of doing anything on send, it
- will just ignore the arguments and do nothing instead.
- """
- def __init__(self, name, doc=None):
- self.name = name
- self.__doc__ = doc
- def _fail(self, *args, **kwargs):
- raise RuntimeError('signalling support is unavailable '
- 'because the blinker library is '
- 'not installed.')
- send = lambda *a, **kw: None # noqa
- connect = disconnect = has_receivers_for = receivers_for = \
- temporarily_connected_to = _fail
- del _fail
- # the namespace for code signals. If you are not mongoengine code, do
- # not put signals in here. Create your own namespace instead.
- _signals = Namespace()
- pre_init = _signals.signal('pre_init')
- post_init = _signals.signal('post_init')
- pre_save = _signals.signal('pre_save')
- pre_save_post_validation = _signals.signal('pre_save_post_validation')
- post_save = _signals.signal('post_save')
- pre_delete = _signals.signal('pre_delete')
- post_delete = _signals.signal('post_delete')
- pre_bulk_insert = _signals.signal('pre_bulk_insert')
- post_bulk_insert = _signals.signal('post_bulk_insert')
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