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https://issues.apache.org/jira/browse/TUSCANY-1493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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bert.robben updated TUSCANY-1493:
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Attachment: sdo.zip
sdo-snapshot.zip
First attachment contains the main interfaces and implementation classes for
snapshots, and mappers.
Second attachment contains the hibernate integration.
> Snapshot mapping framework to convert DataObjects to and from Java objects
> --------------------------------------------------------------------------
>
> Key: TUSCANY-1493
> URL: https://issues.apache.org/jira/browse/TUSCANY-1493
> Project: Tuscany
> Issue Type: New Feature
> Components: Java SDO Implementation
> Reporter: bert.robben
> Attachments: sdo-snapshot.zip, sdo.zip
>
>
> We're developing 3-tier applications with a swing client, JBoss app server
> and a couple of databases in the back-end. We use sdo as mechanism to
> exchange data between our client and our server. On the server side we have a
> fairly complex implementation based partially on Hibernate pojo's, partially
> on an inhouse legacy persistency system. The legacy part (although written in
> Java) is very hard to change. In this environment we often need to convert
> between data objects and server side objects (typically, but not always at a
> transition from server to client or vice versa).
> To support this we developed a mapping framework that allows us to convert
> data between SDO and ordinary Java objects. This framework defines a number
> of important concepts.
> - A snapshot is an opaque collection of structured data at a given moment in
> time. It is opaque in the sense that the data inside can't be accessed
> directly.
> - A Mapper is an interface that defined how data can be accessed from an
> object. We have implementations for SDO DataObjects, normal Java POJO's
> (following java beans convention). hibernate pojos, and support for
> customizing this to access any kind of object (as we need for instance for
> our legacy objects).
> - We defined a DataAccessService (sorry for the confusing name) that given a
> mapper and some objects can create a snapshot. Given a snapshot and a mapper
> it can instantiate new objects. As such we can convert data to and from data
> objects very easily.
> This framework is part of our in-house developed implementation of the SDO
> spec. We want to share our code and experience with the open-source
> community. As such, Frank Budinsky proposed that we make JIRA request for
> this to start the discussion.
> I'll attach the core classes for this feature to this JIRA. At this moment
> I'm not making the entire code available because we implemented more than one
> additional feature (I'll add some more JIRA over the next days) and I'd like
> to have a more focussed discussion. Also, at this moment in time some smaller
> parts of implementation (for instance the hibernate integration) are still
> implemented as a specialization of our SDO implementation. As such they can't
> be built outside of the rest of our application (which is not open-sourced).
> However this is just a matter of finding enough time to move them to our sdo
> component.
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