Saga's DSL

[swistak35]

Code for sagas is often quite similar, but there's always some boilerplate in maintaining sagas state. We could make some nice DSL for that, which would make long live transactions easier to make with event store.
For starters, we could focus on saga which is:

1. always serialized (so there are no steps which can be done in parallel)
2. always sync

And go further from that.

[paneq]

Eventuate Tram

https://github.com/eventuate-tram/eventuate-tram-sagas
https://github.com/eventuate-tram/eventuate-tram-sagas/tree/234fe3d58559c791053b9708013dd323a6bf850f/eventuate-tram-sagas-simple-dsl/src/main/java/io/eventuate/tram/sagas/simpledsl
https://github.com/xstefank/eventuate-tram-service/blob/master/order-service/src/main/java/org/eventuate/saga/orderservice/saga/OrderSaga.java

Axon Framework

https://docs.axoniq.io/reference-guide/implementing-domain-logic/complex-business-transactions/implementing-saga
https://github.com/AxonFramework/Axon-trader/blob/master/orders/src/main/java/org/axonframework/samples/trader/orders/command/SellTradeManagerSaga.java
https://github.com/abuijze/webinar-axon-bank/blob/master/src/main/java/org/axonframework/sample/axonbank/transfer/MoneyTransferSaga.java
https://github.com/xstefank/axon-service/blob/master/order-service/src/main/java/org/learn/axonframework/orderservice/saga/OrderManagementSaga.java

Narayana Long Running Actions (LRA)

http://jbossts.blogspot.com/2017/12/narayana-lra-implementation-of-saga.html
http://jbossts.blogspot.com/2017/12/saga-implementations-comparison.html
https://github.com/xstefank/lra-service

AWS Step Functions

https://aws.amazon.com/step-functions/
https://docs.aws.amazon.com/step-functions/latest/dg/concepts-states.html
https://aws.amazon.com/getting-started/tutorials/create-a-serverless-workflow-step-functions-lambda/?&trk=el_a131L000005unTnQAI&trkCampaign=pac_q2-04-2019_stepfunctions_tutorial_offering_link_2&sc_channel=el&sc_campaign=pac_q2-04-2019_stepfunctions_tutorial&sc_outcome=PaaS_Digital_Marketing&sc_geo=mult
https://aws.amazon.com/getting-started/tutorials/handle-serverless-application-errors-step-functions-lambda/
https://docs.aws.amazon.com/step-functions/latest/dg/concepts-amazon-states-language.html