Accessing Saga Association Values

[Polish-Civil]

Hello,

In my sagas sometimes i have situation where im communicating with external service which does not have any information about the id of the internal service aggregate.
When i receive event back from the external service i would like to continue the organization process internally with the id that has been associated with the saga prior to dispatching the command to the external service.

Currently a way of doing that is to just put the associated value inside saga class so it would be serialized and therefor i'm able to access it and continue the work.

However those situations happen quite a lot, and its just boiler plate code.

It would be really nice to have a way of accessing the association values within the saga event handler.

Example:

class Saga {
    @SagaEventHandler(associationProperty = "internal")
    fun start(evt: InternalEvent) {
        SagaLifecycle.associateWith("external",evt.externalId)
        this.commandGateway.send<Any>(ExternalCommand(evt.externalId))
    }
    
    @SagaEventHandler(associationProperty = "external")
    fun start(evt: ExternalEvent) {
        val internal = SagaLifecycle.getAssociationValue("internal")
        this.commandGateway.send<Any>(InternalCommand(internal))
    }
}

[smcvb]

I recall this question from earlier scenarios too, not sure what the conclusion was though.
I'll make it a point we discuss this in our following meeting, @Polish-Civil.

For now, thanks for the detailed description of your scenario and the suggested solution!

[smcvb]

I like the proposal you made there, @MORLACK.
Let's go ahead with it :-)