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Use the presence cachemap ordering to early-abort the iteration loop
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@ -875,10 +875,15 @@ class PresenceEventSource(object):
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updates = []
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# TODO(paul): use a DeferredList ? How to limit concurrency.
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for observed_user in cachemap.keys():
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for observed_user in reversed(cachemap.keys()):
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cached = cachemap[observed_user]
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if cached.serial <= from_key or cached.serial > max_serial:
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# Since this is ordered in descending order of serial, we can just
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# stop once we've seen enough
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if cached.serial <= from_key:
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break
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if cached.serial > max_serial:
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continue
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if not (yield self.is_visible(observer_user, observed_user)):
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