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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JCR-1604) NameImpl improvements
Date Thu, 15 May 2008 15:17:55 GMT

     [ https://issues.apache.org/jira/browse/JCR-1604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jukka Zitting updated JCR-1604:
-------------------------------

    Attachment: NameImpl.patch

Proposed patch.

> NameImpl improvements
> ---------------------
>
>                 Key: JCR-1604
>                 URL: https://issues.apache.org/jira/browse/JCR-1604
>             Project: Jackrabbit
>          Issue Type: Improvement
>          Components: jackrabbit-jcr-commons
>            Reporter: Jukka Zitting
>            Priority: Minor
>         Attachments: NameImpl.patch
>
>
> I'd like to propose the following changes to NameImpl in jackrabbit-jcr-commons:
> 1) Don't intern the namespace string. Most often the namespace string is in any case
coming from a namespace registry, so there aren't that many copies of the same strings lying
around. Also, I don't think the performance impact on NameImpl.equals() is significant even
if there are multiple copies of the same namespace string.
> 2) Don't memorize the hash code. Since String already memorizes its hash code, the cost
of NameImpl.hashCode() is just a few bytecode instructions. I don't think the performance
benefit is worth the extra complexity and memory overhead.
> 3) Don't memoize the string representation. NameImpl.toString() method is typically only
invoked when debugging or when serializing name values. In both cases the CPU overhead of
recreating the string is insignificant and IMHO not worth the memory overhead .
> I'll attach the patch.

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