1 files changed, 17 insertions, 0 deletions
diff --git a/internal/caching/immutablecache.go b/internal/caching/immutablecache.go
new file mode 100644
index 00000000..fea05dd1
--- /dev/null
+++ b/internal/caching/immutablecache.go
@@ -0,0 +1,17 @@
+package caching
+
+import (
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const (
+	RoomVersionMaxCacheEntries = 1024
+	ServerKeysMaxCacheEntries  = 1024
+)
+
+type ImmutableCache interface {
+	GetRoomVersion(roomId string) (gomatrixserverlib.RoomVersion, bool)
+	StoreRoomVersion(roomId string, roomVersion gomatrixserverlib.RoomVersion)
+	GetServerKey(request gomatrixserverlib.PublicKeyLookupRequest) (gomatrixserverlib.PublicKeyLookupResult, bool)
+	StoreServerKey(request gomatrixserverlib.PublicKeyLookupRequest, response gomatrixserverlib.PublicKeyLookupResult)
+}