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https://github.com/element-hq/synapse
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2 changed files with 15 additions and 0 deletions
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@ -50,6 +50,8 @@ class MessageHandler(BaseHandler):
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self.pagination_lock = ReadWriteLock()
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# We arbitrarily limit concurrent event creation for a room to 5.
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# This is to stop us from diverging history *too* much.
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self.limiter = Limiter(max_count=5)
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@defer.inlineCallbacks
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@ -213,12 +213,21 @@ class Limiter(object):
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max_count(int): The maximum number of concurrent access
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"""
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self.max_count = max_count
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# key_to_defer is a map from the key to a 2 element list where
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# the first element is the number of things executing
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# the second element is a list of deferreds for the things blocked from
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# executing.
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self.key_to_defer = {}
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@defer.inlineCallbacks
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def queue(self, key):
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entry = self.key_to_defer.setdefault(key, [0, []])
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# If the number of things executing is greater than the maximum
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# then add a deferred to the list of blocked items
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# When on of the things currently executing finishes it will callback
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# this item so that it can continue executing.
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if entry[0] >= self.max_count:
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new_defer = defer.Deferred()
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entry[1].append(new_defer)
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@ -232,10 +241,14 @@ class Limiter(object):
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try:
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yield
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finally:
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# We've finished executing so check if there are any things
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# blocked waiting to execute and start one of them
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entry[0] -= 1
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try:
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entry[1].pop(0).callback(None)
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except IndexError:
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# If nothing else is executing for this key then remove it
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# from the map
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if entry[0] == 0:
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self.key_to_defer.pop(key, None)
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