Restore orginal domain object from persisted snapshot

[eladh]

Currently there is no possiblity to retrive original object or converte it from CDO.
In order to produce some kind of POJO based version management Eco-system we must be able to retrieve the original POJO.

Generally speaking i would love to see Javers with version management API like :

1. Retrieve the Original POJO
2. Merge Operation => with Updated/Conflict status
3. Restore Object to X version

do you Store all Object graph or just Incremental information / diff from the last commit ?

10x

[bartoszwalacik]

well, the bigest problem when we try to restore objects from JaversRepository are references.
Restoring a simple ValueObject is relatively easey, but usually we have a object graph. When you restore one node, you may want to follow references to other objects.
This requires tricky lazy-loading proxies like those in Hibernate ... lot of work

[eladh]

thanks for the explanation :-)
is there any chance for a roadmap - we really want to integrate Javers in our product but needs this features as core functionality.

10x

[bartoszwalacik]

hi, now we are finishing implementing JQL (Javers Query Language)
which is a really big step forward.

Concerning this issue, could you give more details about your requirements?
As I said before, restoring a simple, isolated ValueObject (object without references) is quite easy.
But when you want to restore a whole object graph, things gets complicated ...

[eladh]

Hi :-)
i will check JaversRepositoryReader.
for now i will commit the changes by @entity and isolate the whole object graph .
will try to read the project source code and hopefully write a design doc about it.

10x
elad

[bartoszwalacik]

ok, so we stay in touch, in case if you would like to join our new Javers gitter chat room, we are here:
https://gitter.im/javers/javers

[bgalek]

first step: we will provide a method to get graph with limited depth, eagerly loaded
ToDo:

• create InstanceCreator interface available for beeing provided by user
• javers should try to make object by itself if class has empty constructor

[bartoszwalacik]

@smirnp, it would be better to have this code distributed with JaVers. We can accept Pull Request with this feature, with incubating status, to separate JaVers module, lets say, javers-instance-creator. Would you like to contribute this way?

[smirnp]

I'll do it

[bartoszwalacik]

We have decided to design SnapshotsCompiler feature in a different way. Snapshots will be converted to JSON and then we will use GSon deserialization

[milanov]

Hi @bartoszwalacik , do you have an approximate time frame when this will be implemented, since we've done an incomplete bug-ridden version of this "entity restore" feature and could use a built-in version

[bartoszwalacik]

Well, hope it will be released in summer