sijie opened a new pull request #838: Issue-326: Replace observer/observable with a simplified watcher/watchable implementation URL: https://github.com/apache/bookkeeper/pull/838 Descriptions of the changes in this PR: - long poll only need one-time notification on lac updates - replace observer/observable with a simplified watcher/watchable implementation. watchers are removed after they are fired. - add `RecycableHashSet` for `Watchable` keeping the list of watchers - object pooling on `Watchable` and `LastAddConfirmedUpdateNotification`
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