Subscribing to - then logging - all WARN and ERROR events

First we have a switch statement which filters the received events to only ERROR and WARN, and then we log the events using SLF4J (for example).

        eventBus.subscribe(new EventProcessor<>() {
            @Override
            public Predicate<IPFSystemEvent<?>> predicate() {
                return evt -> evt.getLevel() == EventLevel.WARN || evt.getLevel() == EventLevel.ERROR;
            }

            @Override
            public void notify(IPFSystemEvent<?> event) {
                switch (event.getLevel()) {
                    case ERROR:
                        log.error("An error event was raised: {}", event);
                        break;
                    case WARN:
                        log.warn("A warning event was raised: {}", event);
                        break;
                }
            }
        });