yield
Append a new event to the issued operations by this site. A happens-before relationship is established with (at least) all the preceding events on this site; therefore, two subsequent calls to yield guarantee that the order of the operations will be preserved.
Please note that some events might be concurrently inserted to other sites of the log, and it's therefore not possible to predict the EventIdentifier for this event before it will have been yield.
Return
the EventIdentifier that's issued for this new event.
Parameters
event
The event that will be added to the log.