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From "Stefan Guggisberg (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-2619) improved internal representation of DATE values
Date Tue, 27 Apr 2010 12:59:32 GMT

    [ https://issues.apache.org/jira/browse/JCR-2619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861386#action_12861386
] 

Stefan Guggisberg commented on JCR-2619:
----------------------------------------

i've chosen the ISO8601 string representations for the following reasons:

a) smaller footprint 
b) immutable (no cloning required)
c) human readable
d) the ISO8601 format is used extensively for  serialization 
   (persistence layer, remoting protocols, xml, etc),
   => getString()/toString() are very effiicient

i've deliberately not chosen a more space-efficient
binary representation because of d)



> improved internal representation of DATE values
> -----------------------------------------------
>
>                 Key: JCR-2619
>                 URL: https://issues.apache.org/jira/browse/JCR-2619
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core, jackrabbit-spi-commons
>            Reporter: Stefan Guggisberg
>             Fix For: 2.2.0
>
>         Attachments: JCR-2619_improved_internal_representation_of_DATE_values.patch
>
>
> DATE values are currently internally represented as java.util.Calendar objects.
> Calendar objects have a huge memory footprint (approx 200bytes per instance) 
> and are mutable.
> i suggest to replace the internal DATE representation with a ISO8601 format string
> (immutable and approx. 85-90% smaller footprint).

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