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https://github.com/element-hq/synapse
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If stream pos is greater then earliest known key and entity hasn't changed, then entity hasn't changed
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c1de91aca4
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1 changed files with 3 additions and 8 deletions
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@ -52,15 +52,10 @@ class StreamChangeCache(object):
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cache_counter.inc_misses(self.name)
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cache_counter.inc_misses(self.name)
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return True
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return True
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if stream_pos == self._earliest_known_stream_pos:
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# If the same as the earliest key, assume nothing has changed.
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cache_counter.inc_hits(self.name)
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return False
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latest_entity_change_pos = self._entity_to_key.get(entity, None)
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latest_entity_change_pos = self._entity_to_key.get(entity, None)
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if latest_entity_change_pos is None:
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if latest_entity_change_pos is None:
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cache_counter.inc_misses(self.name)
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cache_counter.inc_hits(self.name)
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return True
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return False
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if stream_pos < latest_entity_change_pos:
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if stream_pos < latest_entity_change_pos:
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cache_counter.inc_misses(self.name)
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cache_counter.inc_misses(self.name)
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@ -98,7 +93,7 @@ class StreamChangeCache(object):
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if stream_pos > self._earliest_known_stream_pos:
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if stream_pos > self._earliest_known_stream_pos:
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old_pos = self._entity_to_key.get(entity, None)
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old_pos = self._entity_to_key.get(entity, None)
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if old_pos:
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if old_pos is not None:
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stream_pos = max(stream_pos, old_pos)
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stream_pos = max(stream_pos, old_pos)
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self._cache.pop(old_pos, None)
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self._cache.pop(old_pos, None)
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self._cache[stream_pos] = entity
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self._cache[stream_pos] = entity
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