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Remove duplicated code to evict entries. (#14410)

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This code was factored out to a method, but also left in-place.

Calling this twice in a row makes no sense: the first call will reduce
the size appropriately, but the loop will immediately exit since the
cache size was already reduced.
This commit is contained in:
Patrick Cloke 2022-11-10 15:33:34 -05:00 committed by GitHub
parent b2c2b03079
commit 13ca8bb2fc
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2 changed files with 3 additions and 9 deletions
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1
changelog.d/14410.misc Normal file
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@ -0,0 +1 @@
Remove unreachable code.

11
synapse/util/caches/stream_change_cache.py
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@ -72,7 +72,7 @@ class StreamChangeCache:
items from the cache.
Returns:
bool: Whether the cache changed size or not.
Whether the cache changed size or not.
"""
new_size = math.floor(self._original_max_size * factor)
if new_size != self._max_size:
@ -188,14 +188,8 @@ class StreamChangeCache:
self._entity_to_key[entity] = stream_pos
self._evict()
# if the cache is too big, remove entries
while len(self._cache) > self._max_size:
k, r = self._cache.popitem(0)
self._earliest_known_stream_pos = max(k, self._earliest_known_stream_pos)
for entity in r:
del self._entity_to_key[entity]
def _evict(self) -> None:
# if the cache is too big, remove entries
while len(self._cache) > self._max_size:
k, r = self._cache.popitem(0)
self._earliest_known_stream_pos = max(k, self._earliest_known_stream_pos)
@ -203,7 +197,6 @@ class StreamChangeCache:
self._entity_to_key.pop(entity, None)
def get_max_pos_of_last_change(self, entity: EntityType) -> int:
"""Returns an upper bound of the stream id of the last change to an
entity.
"""