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Message-ID: <1447123832.1254436223695.JavaMail.jira@brutus>
Date: Thu, 1 Oct 2009 15:30:23 -0700 (PDT)
From: "Uwe Schindler (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-1935) Generify PriorityQueue
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    [ https://issues.apache.org/jira/browse/LUCENE-1935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12761372#action_12761372 ] 

Uwe Schindler commented on LUCENE-1935:
---------------------------------------

Was it to avoid a perforance impact of casting or only for cleaner code? Because the generic version of PQ does noch change anything, the resulting byte code is identical (you can compare that with a decompilation using JAD). The casts are added by the Java Compiler automatically.
The lessThan method is covariant overloaded (passed through) by javac: lessThan(Integer, Integer) will appear as such in the class byte code, but javac will add lessThan(Object, Object) that delgates around (which may be a small perf impact), as it is called by the compiled code of PQ (PQ does not know anything about generics in its byte code).

> Generify PriorityQueue
> ----------------------
>
>                 Key: LUCENE-1935
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1935
>             Project: Lucene - Java
>          Issue Type: Task
>          Components: Other
>    Affects Versions: 2.9
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 3.0
>
>         Attachments: LUCENE-1935.patch
>
>
> Priority Queue should use generics like all other Java 5 Collection API classes. This very simple, but makes code more readable.

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