[jira] Commented: (CAY-1512) Change in Behaviour with "Read Property" Methods

["Andrus Adamchik (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CAY-1512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933057#action_12933057 ] 

Andrus Adamchik commented on CAY-1512:
--------------------------------------

Andrew, I don't quite follow what problem are we solving in this Jira?

> Change in Behaviour with "Read Property" Methods
> ------------------------------------------------
>
>                 Key: CAY-1512
>                 URL: https://issues.apache.org/jira/browse/CAY-1512
>             Project: Cayenne
>          Issue Type: Improvement
>          Components: Core Library
>    Affects Versions: 3.0
>            Reporter: Andrew Lindesay
>             Fix For: 3.0.2
>
>
> There is an issue that a data object (DO) uses the "readProperty()" method in its accessors such as "getStartTimestamp()"/"getArtist()" etc... The "readNestedProperty()" does some extra things like using reflection to get at additional accessors, but "readProperty()" does not.  This is an inconsistency.
> Simply adding the additional reflection to "readProperty()" is not a good idea because in the case where an object is not yet related to the model, the reflection can end up infinite-looping and it is hard to see a logical condition to stop it.
> My suggestion is to add a protected "readPropertyStored()" which will be used by the accessors such as "getStartTimestamp()"/"getArtist()".  This method will ~not~ use reflection, but "readProperty()" will do the additional reflection if necessary.  The "readPropertyStored()" will invoke "readPropertyDirectly()".
> In addition, the "extra reflection" would be serviced through two additional methods on the data object;
>      readPropertyDerived(..)
> For the case of the "readNestedProperty(..)" the use of reflection into an object which is ~not~ a data object will be serviced through;
>      readNestedPropertyFromNonDataObject(..)
> 	
> Together these changes will allow for consistenecy in the 'read property' behaviour and will also allow third parties to more easily extend Cayenne's 'read property' behaviours in order to support more sophisticated 'ready property' behaviour.
> This is a change in behaviour and generated DAO classes would need to be modified to use 'readPropertyStored()' instead of 'readProperty()'.

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