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authorErik Johnston <erik@matrix.org>2016-09-15 14:27:15 +0100
committerErik Johnston <erik@matrix.org>2016-09-15 14:28:13 +0100
commitcb3edec6af55efb126f5e7ee66c4d895ef35a66e (patch)
treea80740335d559f06a7568aa633b7ac78ac2e0e00 /synapse/util
parentAdd cache to get_forward_extremeties_for_room (diff)
downloadsynapse-cb3edec6af55efb126f5e7ee66c4d895ef35a66e.tar.xz
Use stream_change cache to make get_forward_extremeties_for_room cache more effective
Diffstat (limited to 'synapse/util')
-rw-r--r--synapse/util/caches/stream_change_cache.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/util/caches/stream_change_cache.py b/synapse/util/caches/stream_change_cache.py
index 3c051dabc4..5c2a433e41 100644
--- a/synapse/util/caches/stream_change_cache.py
+++ b/synapse/util/caches/stream_change_cache.py
@@ -121,3 +121,8 @@ class StreamChangeCache(object):
                 k, r = self._cache.popitem()
                 self._earliest_known_stream_pos = max(k, self._earliest_known_stream_pos)
                 self._entity_to_key.pop(r, None)
+
+    def get_pos_of_last_change(self, entity):
+        """Returns the stream pos of the last change for an entitiy, if known.
+        """
+        return self._entity_to_key.get(entity, None)