The com.digitalasset.canton.lifecycle.OnShutdownRunner associated with this object.

When this com.digitalasset.canton.lifecycle.OnShutdownRunner closes, the health state permanently becomes closingState and all listeners are notified about this.

Fetch the current states from the relevant dependencies and combine them into the new state to report for this element.

The initial state upon creation

Name of the health element. Used for logging.

First removes all dependencies in remove, then adds all those in add. If an ID appears in remove and add, then the ID is replaced. Refreshes the state if any of the dependencies was changed.

Updates of dependencies are not atomic: If this method is called concurrently multiple times, the resulting dependencies may not correspond to a serializable execution.

If an dependency triggers a concurrent state refresh, then the state refresh may see an inconsistent set of dependencies and therefore derive an inconsistent state. This however is only temporary as in this case another state refresh will be triggered at the end.

The state set when the associatedOnShutdownRunner closes

Returns the current state

Triggers a refresh of the component's state, using newState to determine the new state. May return before the newState has been evaluated and the listeners have been poked.

Note that listeners need not be poked about every state change; it suffices that they are poked eventually after each state change. So if there are frequent updates to the state, possibly from concurrent calls, then the listeners may never see some intermediate states.

Registers a listener that gets poked upon each change of this element's health state.

Unregisters a listener.