Custom EventStore in Axon

[Matthew Fontana]

All,

I am looking to implement a custom event store in Axon (3).  I want to get my eventStore to leverage Couchbase.  However, I would prefer to have the Axon implementation integration with the Spring Data Repository pattern so that I can plugin any Spring Data Repository.  Is there any recommendation on how I can approach doing this?  I was going through the MongoDB EventStore implementation so I believe I have a rough idea, but I would like to make sure I clarify the details before I start working on this.

Regards,

Matt

[René de Waele]

Hi,

I'd start by checking out the JpaEventStorageEngine. 

EventProcessors use a TrackingToken to keep track of their position in an event stream so your implementation needs to be able to attach a token to each event message. I never used Couchbase but I saw that they provide some auto-increment functionality via a 'counter()' method. That may be useful to keep track of your position. 

That's pretty much the only thing that's potentially challenging when creating a new EventStorageEngine implementation. The rest follows from the existing examples.  Coding against the Spring Data Repository API should also not present a major challenge. 

Once you're happy with your implementation would you be willing to share it via pull request?

Thanks!

Rene

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[Matthew Fontana]

Definitely I would love to!  Thank you for the advice!

[Tomáš Marný]

Hi. Have you tried to implement something? So just I don't have to write it as well :P