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Running Side Effects

Without Error​

Code​

val doThings: WIO[MyState, Nothing, MyState] =
  WIO
    .runIO[MyState](state => IO(MyEvent()))
    .handleEvent((state, event) => MyState(state.counter + 1))
    .autoNamed

BPMN​

run-io.svg

Model​

{
  "error" : null,
  "name" : "Do Things",
  "_type" : "RunIO"
}

With Error​

Code​

val doThingsWithError: WIO[MyState, MyError, MyState] =
  WIO
    .runIO[MyState](state => IO(MyEvent()))
    .handleEventWithError((state, event) =>
      if (true) MyState(state.counter + 1).asRight
      else MyError().asLeft,
    )
    .autoNamed

BPMN​

run-io.svg

Model​

{
  "error" : {
    "name" : "My Error"
  },
  "name" : "Do Things With Error",
  "_type" : "RunIO"
}