Saving State - Which Trigger Fired?

[Brett Bailey]

Hello

My App has several state machines and i record every state transition by hooking into the constructor Save Delegate.  Each time save is called I insert a row into a database with the updated state.

For audit and debug purposes it would be nice to also record the trigger which caused the transition. 

Is there a way to get the trigger?

~Brett

[Nicholas Blumhardt]

I think a statemachine-wide OnTransition event would be really handy for this, but for one reason or another we've never implemented it. The best substitute right now is to 'for-each' your possible state values, and configure an OnEntry action for each to do the auditing:

foreach (var s in possibleStates)

    sm.Configure(s).OnEntry(t => Log(t));

Cheers,
Nick

~Brett

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[Brett Bailey]

The OnTransitionEvent would be handy.  

Could I ask would it be really difficult to implement?

~Brett

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[Nicholas Blumhardt]

Done - grab the latest (2.4.0) from NuGet and you'll find an OnTransitioned() method available on StateMachine<T,U>.

Cheers,
Nick

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[Brett Bailey]

Hi Nick

Is there any chance this event can be fired at the same time as save state so it can be used as an alternate way of persisting state.  As it stands if I persist state using OnTransitioned() the OnEntry() methods do not fire.

~Brett