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From "Tobias Bocanegra (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-2170) Remove PropDefId and NodeDefId
Date Wed, 24 Jun 2009 13:03:07 GMT
Remove PropDefId and NodeDefId

                 Key: JCR-2170
                 URL: https://issues.apache.org/jira/browse/JCR-2170
             Project: Jackrabbit Content Repository
          Issue Type: Improvement
          Components: jackrabbit-core
    Affects Versions: 2.0.0
            Reporter: Tobias Bocanegra
             Fix For: 2.0.0

the PropDefIds and NodeDefIds are used to quickly lookup a childnode- or property definition
in the nodetype registry (or effective nodetype).
this is heavily used during reading, when calling Property.getDefinition() usually when checking
the isMultiple() flag. and of course while writing when getting the definition for the property
or childnode. 

however, this poses problems when a nodetype is changed that is still used in the content.
if a property definition is changed due to an altered nodetype, subsequent accesses to that
property result in a "invalid propdefid" warning in the log - but the id is recomputed. this
is especially a problem when upgrade jackrabbit from 1.x to 2.0, where some of the builtin
nodetypes are defined differently.

i think that it should be feasible to remove the propdefids and nodedefids and compute the
definition on demand. i think this can be implemented without performance loss, when some
sort of 'signatures' of the items are computed to quickly find the definitions in the effective
node type. furthermore, the most common usecase for using the property definition is probably
the isMultiple() check - which is now on the Property interface itself - which does not need
a definition lookup at all.

and last but not least, it saves 8 bytes per item in the persistence layer.

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