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Thank you for your response. I'm trying to use UML concepts to make blockchain smart contracts as a finite state machine. UML defines events as triggers for state transitions. For a state machine in blockchain events are caused by transactions. So events happen and trigger state transitions. A State Machine should be able to validate transations in consensus code (disable a transaction if it is not allowed in the current state) But if transactions are events, not transitions, seems guards do not help? As guards are for state transitions, not events.

xdimy
– xdimy

2019-11-10 12:55:34 +00:00
Commented Nov 10, 2019 at 12:55
@xdimy I updated my answer to emphasise the distinction between the request (event) and the transaction (action). I also show how an error action could be generated.

Fuhrmanator
– Fuhrmanator

2019-11-10 16:18:09 +00:00
Commented Nov 10, 2019 at 16:18
Thank you, for this case we might consider transactions in mempool as spend_requests and in UML terms they could be defined as 'message events' (more specifically like 'Call for Validation'). That way, we can use guards to validate transactions.

xdimy
– xdimy

2019-11-10 19:32:05 +00:00
Commented Nov 10, 2019 at 19:32

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