Dependency Synchronization

When the Flow Library is updated with a new version and published to its publish location, we want all running instances of Didact Engine to detect the new set of .dll files, shutdown, restart, and absorb the new .dll files at engine startup.

Specifically, if we are running multiple instances of Didact Engine, we want each instance to do this gracefully. By gracefully, we mean that we want a Didact Engine instance to finish running its active Flows, prevent new Flows from being activated, and then initiate the restart process.