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Ensure invalidation list does not grow unboundedly

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This commit is contained in:
Erik Johnston 2016-08-19 15:58:52 +01:00
parent c0d7d9d642
commit 45fd2c8942
4 changed files with 104 additions and 20 deletions
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16
synapse/util/caches/lrucache.py
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@ -32,7 +32,7 @@ def enumerate_leaves(node, depth):
class _Node(object):
__slots__ = ["prev_node", "next_node", "key", "value", "callbacks"]
def __init__(self, prev_node, next_node, key, value, callbacks=[]):
def __init__(self, prev_node, next_node, key, value, callbacks=set()):
self.prev_node = prev_node
self.next_node = next_node
self.key = key
@ -66,7 +66,7 @@ class LruCache(object):
return inner
def add_node(key, value, callbacks=[]):
def add_node(key, value, callbacks=set()):
prev_node = list_root
next_node = prev_node.next_node
node = _Node(prev_node, next_node, key, value, callbacks)
@ -94,7 +94,7 @@ class LruCache(object):
for cb in node.callbacks:
cb()
node.callbacks = []
node.callbacks.clear()
@synchronized
def cache_get(key, default=None, callback=None):
@ -102,7 +102,7 @@ class LruCache(object):
if node is not None:
move_node_to_front(node)
if callback:
node.callbacks.append(callback)
node.callbacks.add(callback)
return node.value
else:
return default
@ -114,18 +114,18 @@ class LruCache(object):
if value != node.value:
for cb in node.callbacks:
cb()
node.callbacks = []
node.callbacks.clear()
if callback:
node.callbacks.append(callback)
node.callbacks.add(callback)
move_node_to_front(node)
node.value = value
else:
if callback:
callbacks = [callback]
callbacks = set([callback])
else:
callbacks = []
callbacks = set()
add_node(key, value, callbacks)
if len(cache) > max_size:
todelete = list_root.prev_node