Code layout change.

[wolnelektury.git] / src / wolnelektury / signals.py

diff --git a/src/wolnelektury/signals.py b/src/wolnelektury/signals.py
new file mode 100644 (file)
index 0000000..5eb7e88
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+++ b/src/wolnelektury/signals.py
@@ -0,0 +1,28 @@
+# -*- coding: utf-8 -*-
+# This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
+# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
+#
+from django.conf import settings
+from django.core.cache import caches
+from django.db.models.signals import post_save, post_delete
+from django.dispatch import receiver
+
+from funding.models import Spent
+from infopages.models import InfoPage
+from libraries.models import Catalog, Library
+from pdcounter.models import Author, BookStub
+
+
+@receiver([post_save, post_delete])
+def flush_views_after_manual_change(sender, **kwargs):
+    """Flushes views cache after changes with some models.
+
+    Changes to those models happen infrequently, so we can afford
+    to just flush the cache on those instances.
+
+    If changes become too often, relevant bits should be separated
+    as ssi_included views and flushed individually when needed.
+
+    """
+    if sender in (Catalog, Library, InfoPage, Author, BookStub, Spent):
+        caches[settings.CACHE_MIDDLEWARE_ALIAS].clear()