Replace DeferredCache with LruCache where possible (#8563)

Most of these uses don't need a full-blown DeferredCache; LruCache is lighter and more appropriate.

1 files changed, 3 insertions, 0 deletions

diff --git a/synapse/util/caches/lrucache.py b/synapse/util/caches/lrucache.py

index 4e95dd9bf3..3b471d8fd3 100644
--- a/synapse/util/caches/lrucache.py
+++ b/synapse/util/caches/lrucache.py
@@ -337,6 +337,9 @@ class LruCache(Generic[KT, VT]):
         self.set = cache_set
         self.setdefault = cache_set_default
         self.pop = cache_pop
+        # `invalidate` is exposed for consistency with DeferredCache, so that it can be
+        # invalidated by the cache invalidation replication stream.
+        self.invalidate = cache_pop
         if cache_type is TreeCache:
             self.del_multi = cache_del_multi
         self.len = synchronized(cache_len)