Listen for Events (Passive Effects)

[elrickvm]

Right now, the only way a simulator can have any effect on the simulation is by either actively handling a request via a service, or by implementing a scenario. But sometimes we just need something that is always running so that it can react to events. A great example of this is when a person is created, making sure that they are provisioned in Auth0, and the Backend.

Maybe add a third thing to Behaviors which is effects? a set of operations that are always running during a simulation?

[jbolda]

This has been completed on at a simulator level in #338.