[jira] [Reopened] (LUCENE-7983) Make IndexReaderWarmer a functional interface

["Dawid Weiss (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7983?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dawid Weiss reopened LUCENE-7983:
---------------------------------

> Make IndexReaderWarmer a functional interface
> ---------------------------------------------
>
>                 Key: LUCENE-7983
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7983
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Dawid Weiss
>            Assignee: Dawid Weiss
>            Priority: Trivial
>             Fix For: 7.1
>
>
> {{IndexReaderWarmer}} has a single method but is an abstract class with a confusing protected constructor. Can we make it a proper functional interface instead? This is marked as {{lucene.experimental}} API and while it would be a binary incompatibility, everything remains the same at the source level, even for existing implementations.
> {code}
> public static abstract class IndexReaderWarmer {
>     /** Sole constructor. (For invocation by subclass 
>      *  constructors, typically implicit.) */
>     protected IndexReaderWarmer() {
>     }
>     /** Invoked on the {@link LeafReader} for the newly
>      *  merged segment, before that segment is made visible
>      *  to near-real-time readers. */
>     public abstract void warm(LeafReader reader) throws IOException;
>   }
> {code}



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