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From "David Rauschenbach (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-1508) Setting a new property value causes a read of the previous property value
Date Sun, 30 Mar 2008 23:20:24 GMT
Setting a new property value causes a read of the previous property value
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                 Key: JCR-1508
                 URL: https://issues.apache.org/jira/browse/JCR-1508
             Project: Jackrabbit
          Issue Type: Bug
          Components: jackrabbit-jcr2spi
    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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