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https://issues.apache.org/jira/browse/TORQUE-343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15333324#comment-15333324
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Thomas Fox commented on TORQUE-343:
-----------------------------------
You can already dynamically extend and exchange the PeerImpls by
SomePeer.setSomePeerImpl() method. It is already kind of a distributed
registry. Would the SomePeers query the registry instead of storing the
PeerImpls locally?
Also a central registry has the problem of type safety. The PeerImpls are
currently generic, yet there are some methods which are generated for some
PeerImpls but not for others (e.g. retrieveByPK(String, int, String, Integer,
Byte, Short, Long, Double, Double, Date) is generated for BaseMultiPkPeerImpl
but not for BaseAuthorPeerImpl) which would require explicit casts if the type
of the returned PeerImpl is not known.
Where would the registry be used? If you can point to some use cases, I could
better make up my opinion.
As for moving the buildCriteria(obj) to the RecordMapper, I'd rather not do
this. Currently, a RecordMapper has the single purpose to map a database record
to the Object. So if one has as strange database structure one has to read, one
can easily implement the RecordMapper interface to perform the mapping
manually. See e.g. the clases in org.apache.torque.om.mapper. Moving other
functionality into this interface would impede this function in my opinion.
However, I'd rather suggest to cerate another object which is responsible for
creating the other way round (object to database) (name suggestion:
...Selector) which then would contain the buildCriteria(Object) method (as well
as perhaps the other build...CriteriaMethods). However this would again
increase the number of created classes, so I am not sure whether this does not
add too much complexity.
As for moving the buildCriteria(obj) to the table map: The table map is
currently not a generated class. How would you accesss the relevant getters for
the data object there?
Again, can you provide a reson why it would be favorable to move the
buildCriteria(obj) method?
> Implement a central registry for peerImpls like the registry for managers
> -------------------------------------------------------------------------
>
> Key: TORQUE-343
> URL: https://issues.apache.org/jira/browse/TORQUE-343
> Project: Torque
> Issue Type: Improvement
> Components: Runtime, Templates
> Affects Versions: 4.0
> Reporter: Thomas Vandahl
> Assignee: Thomas Vandahl
> Fix For: 4.1
>
>
> I'd like to suggest a central registry for peerImpl-objects which can be
> queried by the Persistent class it is responsible for. This would allow
> reusing and extending the peer objects dynamically as well as giving them
> some kind of life-cycle.
> The main method would be similar to this:
> {code:java}
> public <T> BasePeerImpl<T> getPeerFor(Class<T> persistentClass)
> {
> return peerRegistry.get(persistentClass);
> }
> {code}
> I would also like to suggest moving the buildCriteria(obj) method to the
> RecordMapper or the TableMap class. This will further reduce the amount of
> code that needs to be generated.
> If the idea is received well, I'll come up with a proposal.
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