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-rw-r--r--synapse/storage/_base.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py
index 9e348590ba..2210b3ddfb 100644
--- a/synapse/storage/_base.py
+++ b/synapse/storage/_base.py
@@ -124,6 +124,11 @@ class Cache(object):
         self.sequence += 1
         self.cache.pop(keyargs, None)
 
+    def invalidate_all(self):
+        self.check_thread()
+        self.sequence += 1
+        self.cache.clear()
+
 
 def cached(max_entries=1000, num_args=1, lru=False):
     """ A method decorator that applies a memoizing cache around the function.