CODEWITHSUNDEEP
spring-statemachine
anuni
anuni

Reputation: 999

How to change the target state in a state machine

First, I'm not quite sure whether my case is suitable to use spring state machine.

Here're my case:

I have a big mutable object and a set of logic unit which will manipulate this mutable object in a certain sequence.

For a normal flow: A.exec -> B.exec -> C.exec -> Done

For a bad flow that exception throws from A: A -> Error - > Done (B and C is bypassed)

For a bad flow that exception throws from B: A -> B - > Another Flow

I guess A, B, C could be modeled as a state while an action could be used to perform real biz logic when transit from A to B.

How can I capture possible thrown exception from A and change the target to another state instead of B?

Thanks

Leon

Upvotes: 0

Views: 685

Answers (1)

Janne Valkealahti
Janne Valkealahti

Reputation: 2646

I'd use junction or choice and define guards for outgoing transitions. Something what is discussed in gh240. Then you can catch your exceptions and i.e. store something in an extended state and then from your guards you are free to evaluate different conditions.

Choice is pretty much if/elseif/else structure to define which branch machine will follow for transitions.

There's also deploy sample which is modelled with same concepts.

Upvotes: 1

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