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Asked: 2026-05-24T07:35:11+00:00

I implement versioning for my own domain model (tracking of differences in objects during

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I implement versioning for my own domain model (tracking of differences in objects during update operations). Domain model has a tree structure. E.g. (-> is reference)

A
|-> B
|-> C -> A
    | -> C

Requirements for versioning are following:

  • Get the set of changed fields between two versions of domain object;
  • Domain model has a tree structure;
  • Fields can be organized in lists. In following example system should show that Y element was removed (but not that Z was removed and Y changed its state on Z) and X was changed:

      [ v1 ]              [ v2 ]
        A                    A
        |-> [X, Y, Z]        |-> [X, Z]
             |-> C                |-> M
  • There are no more requirements like locking/merging/branching.

I investigate the way to get change set between two states of the same object. I work with Java and interested in exist approaches/solutions. E.g. I’m looking for description of algorithm that subversion use to create next revision.

I will glad to get any theoretical or practical advice from your side.

Thanks

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1 Answer

  1. Editorial Team

    Well, I would say, you speak of 2 different things here.

    Subversion has a revision number for the complete tree, meaning every change is a cheap copy of the previous version. So, there’s no changeset in the term you have in your object hierarchy. It’s more the sum off all changes – and they are calculated per file by your usual diff mechanism.

    If you need versioning for your persisted objects, I would add a version attribute in each and then a method per class calculating the differences. But maybe you’ll need to tell us how you plan to use that information?

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