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From "angela (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JCR-1508) Setting a new property value causes a read of the previous property value
Date Wed, 22 Oct 2008 16:05:44 GMT

     [ https://issues.apache.org/jira/browse/JCR-1508?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

angela updated JCR-1508:
------------------------

    Component/s: jackrabbit-spi
     Issue Type: New Feature  (was: Bug)

not a bug but a new feature request. the jcr2spi works as expected with respect to the current
abilities of the SPI. adding the 'check-with-SPI' functionality as suggested by marcel/julian
also requires changes to SPI -> adding additional component.

> Setting a new property value causes a read of the previous property value
> -------------------------------------------------------------------------
>
>                 Key: JCR-1508
>                 URL: https://issues.apache.org/jira/browse/JCR-1508
>             Project: Jackrabbit
>          Issue Type: New Feature
>          Components: jackrabbit-jcr2spi, jackrabbit-spi
>    Affects Versions: 1.4
>            Reporter: David Rauschenbach
>
> When using JCR2SPI with a custom SPI, getProperty is called when one attempts to set
a new property value with disregard to the previous value. The current JCR2SPI implementation
causes a getPropertyInfo, which requests the old value from the back-end. This is fundamentally
unsound, and kills performance.
> An SPI has no choice but to guard against this by returning a PropertyInfo proxy that
performs lazy-loading of the value. The problem is that if an error occurs when dereferencing
the value, and when performing the lazy-load, JCR2SPI is ill-suited to hande an unchecked
exception at such a time. Besides, it is a "hack upon a hack", because JCR2SPI could do this
work itself, by making proper use of the SPI functions for requesting property type information.

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