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authorErik Johnston <erik@matrix.org>2017-02-02 16:50:28 +0000
committerErik Johnston <erik@matrix.org>2017-02-02 16:50:28 +0000
commitf8c407a13b04f906dc761bcf33992e05af219098 (patch)
tree0479c242f3d7df94437755296616e657a0a15858 /synapse/util
parentUpdate changelog (diff)
parentMerge pull request #1877 from matrix-org/erikj/device_list_fixes (diff)
downloadsynapse-f8c407a13b04f906dc761bcf33992e05af219098.tar.xz
Merge branch 'develop' of github.com:matrix-org/synapse into release-v0.19.0
Diffstat (limited to '')
-rw-r--r--synapse/util/caches/descriptors.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/util/caches/descriptors.py b/synapse/util/caches/descriptors.py
index 675bfd5feb..998de70d29 100644
--- a/synapse/util/caches/descriptors.py
+++ b/synapse/util/caches/descriptors.py
@@ -478,6 +478,11 @@ class CacheListDescriptor(object):
 
 
 class _CacheContext(namedtuple("_CacheContext", ("cache", "key"))):
+    # We rely on _CacheContext implementing __eq__ and __hash__ sensibly,
+    # which namedtuple does for us (i.e. two _CacheContext are the same if
+    # their caches and keys match). This is important in particular to
+    # dedupe when we add callbacks to lru cache nodes, otherwise the number
+    # of callbacks would grow.
     def invalidate(self):
         self.cache.invalidate(self.key)