Raise event inside Activity and Observer

[Alex Michel]

Hi,

Is it fine to raise state machine events inside activity that is called in Execute method?

In this case it is pure Automatonymous state machine - not saga.

E.g. if I create delegates that wrap event lifters and pass it in constructor, so that activity will end up raising one of the events (completed or failed)? 

Wouldn't that cause cyclic dependency? 

Another scenario I have is parent and child state machines, where parent is observer of child fsm,

and on certain transition of child it would raise event with lifter to move itself to the next state.

Thanks

[Chris Patterson]

Well, you should be able to raise events from within event activities, I'm not sure how dangerous that is because you could end up in a bad place. If you raise the event, however, you'd need to make sure any state transitions have taken place in advance of raising the event. Injecting lifts is a good approach to avoid coupling directly to the state machine, I would agree.

Also, using an "activity factory" to create the activities (we resolve them from a container) instead of creating the activities in the state machine itself can help keep things decoupled.

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[Alex Michel]

Hi Chris,

It seems to work with regular state machine, 

but when I do it inside Saga it always fails with "The consume context could not be retrieved."  'MassTransit.ContextException' in MassTransit.AutomatonymousIntegration.dll

I tried to simply call RaiseEvent inside Then.