From cb3edec6af55efb126f5e7ee66c4d895ef35a66e Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Thu, 15 Sep 2016 14:27:15 +0100 Subject: Use stream_change cache to make get_forward_extremeties_for_room cache more effective --- synapse/storage/event_federation.py | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) (limited to 'synapse/storage') diff --git a/synapse/storage/event_federation.py b/synapse/storage/event_federation.py index 050b78d652..97d0c26475 100644 --- a/synapse/storage/event_federation.py +++ b/synapse/storage/event_federation.py @@ -344,8 +344,17 @@ class EventFederationStore(SQLBaseStore): self.get_latest_event_ids_in_room.invalidate, (room_id,) ) - @cached(max_entries=5000, num_args=2) def get_forward_extremeties_for_room(self, room_id, stream_ordering): + # We want to make the cache more effective, so we clamp to the last + # change before the given ordering. + last_change = self._events_stream_cache.get_pos_of_last_change(room_id) + if last_change: + stream_ordering = min(last_change, stream_ordering) + + return self._get_forward_extremeties_for_room(room_id, stream_ordering) + + @cached(max_entries=5000, num_args=2) + def _get_forward_extremeties_for_room(self, room_id, stream_ordering): """For a given room_id and stream_ordering, return the forward extremeties of the room at that point in "time". -- cgit 1.5.1