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Use stream_change cache to make get_forward_extremeties_for_room cache more effective

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This commit is contained in:
Erik Johnston 2016-09-15 14:27:15 +01:00
parent 55e6fc917c
commit cb3edec6af
3 changed files with 19 additions and 2 deletions
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11
synapse/storage/event_federation.py
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@ -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".