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https://issues.apache.org/jira/browse/CAY-2955?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrus Adamchik updated CAY-2955:
---------------------------------
Description:
QueryEngine interface is not that useful. Cayenne is all about relational
databases, and the original abstraction allowed to replace DataNode with a
non-JDBC backend (like LDAP or NoSQL). We really don't care about this anymore
(and I am not aware of anyone actually doing it).
So let's unwind it:
* DataDomain wasn't a true QueryEngine, so drop its implementation and
deprecate "performQueries()"
* Replace uses of QueryEngine with DataNode.
* remove QueryEngine
Upgrade notes: If somebody really implemented a custom QueryEngine, they can
try subclassing DataNode and overriding "performQueries()". It won't be as
pretty, but such an extension is still possible.
was:QueryEngine interface has outlived its usefulness. It was an early
Cayenne abstraction when the stack structure was still evolving. Now only
DataNode is a true "QueryEngine". DataDomain is not, though it still clings to
the implementation. So let's get rid of this interface and use DataNode
explicitly instead of it.
> Get rid of QueryEngine
> ----------------------
>
> Key: CAY-2955
> URL: https://issues.apache.org/jira/browse/CAY-2955
> Project: Cayenne
> Issue Type: Task
> Reporter: Andrus Adamchik
> Assignee: Andrus Adamchik
> Priority: Minor
> Fix For: 5.0-M2
>
>
> QueryEngine interface is not that useful. Cayenne is all about relational
> databases, and the original abstraction allowed to replace DataNode with a
> non-JDBC backend (like LDAP or NoSQL). We really don't care about this
> anymore (and I am not aware of anyone actually doing it).
> So let's unwind it:
>
> * DataDomain wasn't a true QueryEngine, so drop its implementation and
> deprecate "performQueries()"
> * Replace uses of QueryEngine with DataNode.
> * remove QueryEngine
> Upgrade notes: If somebody really implemented a custom QueryEngine, they can
> try subclassing DataNode and overriding "performQueries()". It won't be as
> pretty, but such an extension is still possible.
>
>
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