Added philo-root reversal caching to Node.construct_url.

[philo.git] / philo / models / nodes.py

diff --git a/philo/models/nodes.py b/philo/models/nodes.py
index 9309a42..7371a1d 100644 (file)
--- a/philo/models/nodes.py
+++ b/philo/models/nodes.py
@@ -2,9 +2,11 @@ from inspect import getargspec
 import mimetypes
 from os.path import basename
 
+from django.conf import settings
 from django.contrib.contenttypes import generic
 from django.contrib.contenttypes.models import ContentType
 from django.contrib.sites.models import Site, RequestSite
+from django.core.cache import cache
 from django.core.exceptions import ValidationError
 from django.core.servers.basehttp import FileWrapper
 from django.core.urlresolvers import resolve, clear_url_caches, reverse, NoReverseMatch
@@ -24,6 +26,7 @@ __all__ = ('Node', 'View', 'MultiView', 'Redirect', 'File')
 
 
 _view_content_type_limiter = ContentTypeSubclassLimiter(None)
+CACHE_PHILO_ROOT = getattr(settings, "PHILO_CACHE_PHILO_ROOT", True)
 
 
 class Node(SlugTreeEntity):
@@ -44,13 +47,15 @@ class Node(SlugTreeEntity):
                return False
        
        def handles_subpath(self, subpath):
-               if self.view:
-                       return self.view.handles_subpath(subpath)
+               if self.view_object_id and self.view_content_type_id:
+                       return ContentType.objects.get_for_id(self.view_content_type_id).model_class().handles_subpath(subpath)
                return False
        
        def render_to_response(self, request, extra_context=None):
                """This is a shortcut method for :meth:`View.render_to_response`"""
-               if self.view:
+               if self.view_object_id and self.view_content_type_id:
+                       view_model = ContentType.objects.get_for_id(self.view_content_type_id).model_class()
+                       self.view = view_model._default_manager.select_related(depth=1).get(pk=self.view_object_id)
                        return self.view.render_to_response(request, extra_context)
                raise Http404
        
@@ -69,6 +74,8 @@ class Node(SlugTreeEntity):
                
                Node urls will not contain a trailing slash unless a subpath is provided which ends with a trailing slash. Subpaths are expected to begin with a slash, as if returned by :func:`django.core.urlresolvers.reverse`.
                
+               Because this method will be called frequently and will always try to reverse ``philo-root``, the results of that reversal will be cached by default. This can be disabled by setting :setting:`PHILO_CACHE_PHILO_ROOT` to ``False``.
+               
                :meth:`construct_url` may raise the following exceptions:
                
                - :class:`NoReverseMatch` if "philo-root" is not reversable -- for example, if :mod:`philo.urls` is not included anywhere in your urlpatterns.
@@ -83,7 +90,14 @@ class Node(SlugTreeEntity):
                
                """
                # Try reversing philo-root first, since we can't do anything if that fails.
-               root_url = reverse('philo-root')
+               if CACHE_PHILO_ROOT:
+                       key = "CACHE_PHILO_ROOT__" + settings.ROOT_URLCONF
+                       root_url = cache.get(key)
+                       if root_url is None:
+                               root_url = reverse('philo-root')
+                               cache.set(key, root_url)
+               else:
+                       root_url = reverse('philo-root')
                
                try:
                        current_site = Site.objects.get_current()
@@ -129,9 +143,10 @@ class View(Entity):
        #: An attribute on the class which defines whether this :class:`View` can handle subpaths. Default: ``False``
        accepts_subpath = False
        
-       def handles_subpath(self, subpath):
+       @classmethod
+       def handles_subpath(cls, subpath):
                """Returns True if the :class:`View` handles the given subpath, and False otherwise."""
-               if not self.accepts_subpath and subpath != "/":
+               if not cls.accepts_subpath and subpath != "/":
                        return False
                return True
        
@@ -226,15 +241,6 @@ class MultiView(View):
                """Returns urlpatterns that point to views (generally methods on the class). :class:`MultiView`\ s can be thought of as "managing" these subpaths."""
                raise NotImplementedError("MultiView subclasses must implement urlpatterns.")
        
-       def handles_subpath(self, subpath):
-               if not super(MultiView, self).handles_subpath(subpath):
-                       return False
-               try:
-                       resolve(subpath, urlconf=self)
-               except Http404:
-                       return False
-               return True
-       
        def actually_render_to_response(self, request, extra_context=None):
                """
                Resolves the remaining subpath left after finding this :class:`View`'s node using :attr:`self.urlpatterns <urlpatterns>` and renders the view function (or method) found with the appropriate args and kwargs.