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https://issues.apache.org/jira/browse/ZOOKEEPER-1094?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Henry Robinson updated ZOOKEEPER-1094:
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Attachment: ZK-1094.patch
Updated patch against trunk, in particular ZOOKEEPER-335.
> Small improvements to LeaderElection and Vote classes
> -----------------------------------------------------
>
> Key: ZOOKEEPER-1094
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1094
> Project: ZooKeeper
> Issue Type: Improvement
> Components: quorum
> Reporter: Henry Robinson
> Assignee: Henry Robinson
> Priority: Minor
> Attachments: ZK-1094.patch, ZK-1094.patch
>
>
> 1. o.a.z.q.Vote is a struct-style class, whose fields are public and not
> final.
> In general, we should prefer making the fields of these kind of classes
> final, and hiding them behind getters for the following reasons:
> * Marking them as final allows clients of the class not to worry about any
> synchronisation when accessing the fields
> * Hiding them behind getters allows us to change the implementation of the
> class without changing the API.
> Object creation is very cheap. It's ok to create new Votes rather than mutate
> existing ones.
> 2. Votes are mainly used in the LeaderElection class. In this class a map of
> addresses to votes is passed in to countVotes, which modifies the map
> contents inside an iterator (and therefore changes the object passed in by
> reference). This is pretty gross, so at the same time I've slightly
> refactored this method to return information about the number of validVotes
> in the ElectionResult class, which is returned by countVotes.
> 3. The previous implementation of countVotes was quadratic in the number of
> votes. It is possible to do this linearly. No real speed-up is expected as a
> result, but it salves the CS OCD in me :)
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