diff --git a/src/cmsplugin_blurp/renderers/data_source.py b/src/cmsplugin_blurp/renderers/data_source.py
index 8b6d88c..5d1fb42 100644
--- a/src/cmsplugin_blurp/renderers/data_source.py
+++ b/src/cmsplugin_blurp/renderers/data_source.py
@@ -90,6 +90,14 @@ class Renderer(template.TemplateRenderer):
         if settings.TEMPLATE_DEBUG:
             yield 'blurp_debug__', '\n'.join(self.debug_content(context))
 
+    def has_cached_content(self, context):
+        for source in self.config['sources']:
+            slug = '{0}.{1}'.format(self.slug, source['slug'])
+            data = Data(slug, self.config, source, context)
+            if not data.has_cached_content():
+                return False
+        return True
+
     def debug_content(self, context):
         try:
             yield u'config: {0}'.format(pprint.pformat(self.config))
@@ -319,6 +327,10 @@ class Data(object):
     UPDATE_THREADS = {}
     CONDITIONS = {}
 
+    def has_cached_content(self):
+        self.__content, until = cache.get(self.key, (self.__CACHE_SENTINEL, None))
+        return self.__content is not self.__CACHE_SENTINEL
+
     def get_content(self):
         if self.__content is not self.__CACHE_SENTINEL:
             return self.__content