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From "Nikita Timofeev (Jira)" <j...@apache.org>
Subject [jira] [Assigned] (CAY-2641) Add Lazy Attributes
Date Thu, 14 May 2020 11:44:00 GMT

     [ https://issues.apache.org/jira/browse/CAY-2641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nikita Timofeev reassigned CAY-2641:
------------------------------------

    Assignee: Nikita Timofeev

> Add Lazy Attributes
> -------------------
>
>                 Key: CAY-2641
>                 URL: https://issues.apache.org/jira/browse/CAY-2641
>             Project: Cayenne
>          Issue Type: Improvement
>          Components: Core Library, Documentation, Modeler, ROP, Website
>    Affects Versions: Undefined future
>            Reporter: Michael Ray Gentry
>            Assignee: Nikita Timofeev
>            Priority: Minor
>             Fix For: 4.2.M2
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Add the ability to mark an attribute as lazy.  Such attributes will be excluded from
the original SELECT query and subsequently calling the lazy attribute's getter (and perhaps
the setter?) will trigger a fault to the DB to retrieve the actually contents.  This will
be useful for BLOB type data that you might want to exclude during a normal fetch of metadata
(file name, size, etc) in tables where which include both.
> Initial thoughts:
>  * Update Cayenne Modeler to have a "Lazy" column in the Object Attribute editor which
is a checkbox (like the Optimistic Locking toggle).
>  * Update the XML format to support a lazy="true" or lazy="false" (the default) attribute
to the obj-attribute tag.
>  * Update CayenneDataObject to handle lazy attribute faults.  Will likely need some
new support classes.
>  * Update Velocity templates to generate correct code for lazy attributes.
>  * Update query code to omit lazy attributes from SELECTs and create fault objects for
them.
>  * Update commit code to omit lazy attributes from UPDATEs (ones that haven't been faulted
in yet, even if used for Optimistic Locking).
> I'm sure there are other things I'm missing, plus need to handle ROP, which I'm not familiar
with using.
>  



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