[GitHub] leventov opened a new pull request #6606: Simplify DruidNodeDiscoveryProvider; add DruidNodeDiscovery.Listener.nodeViewInitialized()

[GitBox <gi...@apache.org>]

leventov opened a new pull request #6606: Simplify DruidNodeDiscoveryProvider; add DruidNodeDiscovery.Listener.nodeViewInitialized()
URL: https://github.com/apache/incubator-druid/pull/6606
 
 
   Recently I spend maybe about 3 hours trying to understand `DruidNodeDiscoveryProvider`. In hopes to make it simpler for other people, I refactored this class.
   
   In order to clarify the logic, I added a separate `DruidNodeDiscovery.Listener.nodeViewInitialized()` method, that brings a secondary benefit: listeners registered with `ServiceDruidNodeDiscovery` could proceed with partially initialized node view if they want, even if some node type didn't report initialization for whatever reason. Although I didn't change any of those listeners yet.
   
   Finally, prohibited and eliminated some suboptimal Java 8 usage patterns.

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