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Date: Wed, 8 Mar 2017 06:05:03 +0000 (UTC)
From: David Tildesley <davotnz@yahoo.co.nz.INVALID>
Reply-To: David Tildesley <davotnz@yahoo.co.nz>
To: "Users@isis Apache. Org" <users@isis.apache.org>
Message-ID: <2077943161.988524.1488953103156@mail.yahoo.com>
Subject: Deep copy object graph
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archived-at: Wed, 08 Mar 2017 06:09:14 -0000

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Hi,
I have a need to keep public records and to be able to edit objects and put=
 them through a publishing lifecycle whilst public can view the current rec=
ord without seeing the changes.
Temporal object pattern [1] seems like the simplest pattern.
Then it comes down to how hard or easy it is to simply =C2=A0copy a compone=
nts entire object graph to make a new version (don't really care about the =
duplication of data that hasn't change from version to version).
Datanucleus has some support for coping an object graph from one repository=
 to another - I assume you can copy to the same repository to achieve what =
I want to do.
Krypo [2] seems like it is being used by Datanucleus.
Anyways - how to do this with ISIS? Any suggestions appreciated.
Some context:
A Building (component) =C2=A0has a current FireSafetyCertification (compone=
nt) and is published as a public record and these records are kept for 10 y=
ears. A change to a record that is viewable by the public is regarded as a =
new public record. Overtime (slowly) these FireSafetyCertificates may expir=
e/withdrawn/change in detail. But when they are published they constitute a=
 public record. Building has names, addresses, images, parts, construction =
details, etc. whilst FireSafetyCertification has documents, exemption notic=
es, expiry dates etc.=C2=A0
Using the Temporal Object pattern, a Building object has 1..* BuildingVersi=
on and all of the Building's detail hangs off BuildingVersion.=C2=A0
Any other suggestions instead of Temporal Object pattern also appreciated.
[1] https://martinfowler.com/eaaDev/TemporalObject.html=C2=A0[2]=C2=A0http:=
//camposha.info/source/java-kryo/
Thanks!
David.
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