presto-main/src/main/java/io/prestosql/event/SplitMonitor.java/SplitMonitor/SplitMonitor
class SplitMonitor:    @Inject
    public SplitMonitor(EventListenerManager eventListenerManager, ObjectMapper objectMapper)
    {
        this.eventListenerManager = requireNonNull(eventListenerManager, "eventListenerManager is null");
        this.objectMapper = requireNonNull(objectMapper, "objectMapper is null");
    }