From c4e64669264c981efde3118457faa277196eff62 Mon Sep 17 00:00:00 2001
From: Oskar Hahn <mail@oshahn.de>
Date: Thu, 25 Oct 2012 15:17:25 +0200
Subject: [PATCH] Added cache for the ajax-version of the projector

---
 openslides/openslides_global_settings.py |  7 +++++++
 openslides/projector/api.py              |  3 +++
 openslides/projector/views.py            | 18 ++++++++++++++----
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/openslides/openslides_global_settings.py b/openslides/openslides_global_settings.py
index 5d3348e9c..6b0417b0d 100644
--- a/openslides/openslides_global_settings.py
+++ b/openslides/openslides_global_settings.py
@@ -134,3 +134,10 @@ TEMPLATE_CONTEXT_PROCESSORS = (
     'openslides.utils.utils.revision',
     'openslides.utils.auth.anonymous_context_additions',
 )
+
+CACHES = {
+    'default': {
+        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
+        'LOCATION': 'openslidecache'
+    }
+}
diff --git a/openslides/projector/api.py b/openslides/projector/api.py
index 56fe4e0d4..de0cf03b8 100644
--- a/openslides/projector/api.py
+++ b/openslides/projector/api.py
@@ -11,6 +11,7 @@
 """
 
 from django.conf import settings
+from django.core.cache import cache
 from django.template.loader import render_to_string
 from django.utils.datastructures import SortedDict
 from django.utils.importlib import import_module
@@ -85,6 +86,8 @@ def set_active_slide(sid, argument=None):
     """
     config["presentation"] = sid
     config['presentation_argument'] = argument
+    cache.delete('projector_content')
+    cache.delete('projector_scrollcontent')
 
 
 def register_slidemodel(model, model_name=None, control_template=None,
diff --git a/openslides/projector/views.py b/openslides/projector/views.py
index 6a71ad637..54fa7a866 100644
--- a/openslides/projector/views.py
+++ b/openslides/projector/views.py
@@ -15,6 +15,7 @@ from time import time
 
 from django.conf import settings
 from django.contrib import messages
+from django.core.cache import cache
 from django.core.context_processors import csrf
 from django.core.urlresolvers import reverse
 from django.db import transaction
@@ -107,10 +108,19 @@ class Projector(TemplateView, AjaxMixin):
         return context
 
     def get_ajax_context(self, **kwargs):
-        content = render_block_to_string(self.get_template_names()[0],
-            'content', self.data)
-        scrollcontent = render_block_to_string(self.get_template_names()[0],
-            'scrollcontent', self.data)
+        content = cache.get('projector_content')
+        if not content:
+            content = render_block_to_string(
+                self.get_template_names()[0],
+                'content', self.data)
+            cache.set('projector_content', content)
+
+        scrollcontent = cache.get('projector_scrollcontent')
+        if not scrollcontent:
+            scrollcontent = render_block_to_string(
+                self.get_template_names()[0],
+                'scrollcontent', self.data)
+            cache.set('projector_scrollcontent', scrollcontent)
 
         context = super(Projector, self).get_ajax_context(**kwargs)
         content_hash = hash(content)