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From "Craig Russell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-370) LoadFetchGroup annotation was not recognized during the fetch1
Date Wed, 31 Oct 2007 23:51:51 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12539221
] 

Craig Russell commented on OPENJPA-370:
---------------------------------------

> Before the instance is returned to the caller, the fields are checked again if they cause
any other field be loaded because LoadFecthGroup. At that point, if field f has a LoadFetchGroup
L and L is not part of the active fetch configuration then *temporarily* add L to the active
FetchConfiguration and go for another 'fetch' (i.e. from the datastore). 

This sounds wrong. The effect of the load fetch group should be part of the fetch strategy,
and no post-fetch analysis should be done. The only time the load fetch group is used is if
a field f is accessed and it's not already fetched. 

The intent of the load fetch group is to augment the fetch plan under which the persistent
instance was fetched. It's designed to provide an intelligent fetch strategy for the lower-usage
cases where some use needs field f1 (not in any fetch group in the current fetch plan) and
when using field f1 you want to also fetch fields f2, f3, and f4, that are also not part of
the current fetch plan.


> LoadFetchGroup annotation was not recognized during the fetch1
> --------------------------------------------------------------
>
>                 Key: OPENJPA-370
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-370
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: kernel
>    Affects Versions: 1.0.1, 1.1.0
>            Reporter: Teresa Kan
>            Assignee: Teresa Kan
>             Fix For: 1.0.1, 1.1.0
>
>         Attachments: OPENJPA_370_2.patch, TestFetchGroup.zip
>
>
> Employee class has a LoadFetchGroup annotation defined on the Rating field, when getRating
was called, the address should be returned also. However, openjpa did not handle the LoadFetchGroup
correctly, therefore, address was not eargly fetched.
> public class FGEmployee{
>     @Id
>     private int id;
>  
>     @OneToOne(fetch=FetchType.LAZY) 
>     private FGAddress address;
>  
>     @Basic(fetch=FetchType.LAZY)
>     @LoadFetchGroup("AddressFetchGroup")
>     private String rating;
>  
>     @ManyToOne(fetch=FetchType.LAZY)
>     private FGManager manager;
> ..
> }

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