from zope.component.registry import Components
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from pyramid.interfaces import ISettings
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class Registry(Components, dict):
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""" A registry object is an :term:`application registry`. The existence
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of a registry implementation detail of :app:`pyramid`. It is used by the
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framework itself to perform mappings of URLs to view callables, as well
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as servicing other various duties. Despite being an implementation detail
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of the framework, it has a number of attributes that may be useful within
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application code.
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For information about the purpose and usage of the application registry,
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see :ref:`zca_chapter`.
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The application registry is usually accessed as ``request.registry`` in
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application code.
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"""
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# for optimization purposes, if no listeners are listening, don't try
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# to notify them
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has_listeners = False
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_settings = None
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def registerSubscriptionAdapter(self, *arg, **kw):
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result = Components.registerSubscriptionAdapter(self, *arg, **kw)
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self.has_listeners = True
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return result
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def registerSelfAdapter(self, required=None, provided=None, name=u'',
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info=u'', event=True):
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# registerAdapter analogue which always returns the object itself
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# when required is matched
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return self.registerAdapter(lambda x: x, required=required,
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provided=provided, name=name,
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info=info, event=event)
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def queryAdapterOrSelf(self, object, interface, default=None):
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# queryAdapter analogue which returns the object if it implements
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# the interface, otherwise it will return an adaptation to the
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# interface
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if not interface.providedBy(object):
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return self.queryAdapter(object, interface, default=default)
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return object
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def registerHandler(self, *arg, **kw):
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result = Components.registerHandler(self, *arg, **kw)
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self.has_listeners = True
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return result
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def notify(self, *events):
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if self.has_listeners:
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# iterating over subscribers assures they get executed
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[ _ for _ in self.subscribers(events, None) ]
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# backwards compatibility for code that wants to look up a settings
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# object via ``registry.getUtility(ISettings)``
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def _get_settings(self):
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return self._settings
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def _set_settings(self, settings):
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self.registerUtility(settings, ISettings)
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self._settings = settings
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settings = property(_get_settings, _set_settings)
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global_registry = Registry('global')
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