[jira] [Created] (ZOOKEEPER-3523) Replace dummy watcher with a unified singleton

Tue, 27 Aug 2019 09:50:07 -0700 

TisonKun created ZOOKEEPER-3523:
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             Summary: Replace dummy watcher with a unified singleton
                 Key: ZOOKEEPER-3523
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3523
             Project: ZooKeeper
          Issue Type: Improvement
          Components: server, tests
    Affects Versions: 3.6.0
            Reporter: TisonKun
            Assignee: TisonKun
             Fix For: 3.6.0


Currently we have many anonymous subclasses of {{Watch}} all of which is just 
{{event -> \{ }}}. We can reduce many subclasses in inherit tree by add a 
{{DUMMY_WATCHER}} in {{Watcher}} interface and replace all of those usages.



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