Axon InMemory Eventstorage with ability to log the events

EmbeddedInMemoryEventStore.java

import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.axonframework.eventhandling.TrackedEventMessage;
import org.axonframework.eventsourcing.eventstore.EmbeddedEventStore;
import org.axonframework.eventsourcing.eventstore.GlobalSequenceTrackingToken;
import org.axonframework.eventsourcing.eventstore.TrackingToken;
import org.axonframework.eventsourcing.eventstore.inmemory.InMemoryEventStorageEngine;

import java.lang.reflect.Field;
import java.util.NavigableMap;
import java.util.function.Supplier;

@Slf4j(topic = "eventStore")
@SuppressWarnings("unchecked")
public class EmbeddedInMemoryEventStore extends EmbeddedEventStore {

    private static final InMemoryEventStorageEngine STORAGE_ENGINE = new InMemoryEventStorageEngine();

    private final Supplier<NavigableMap<TrackingToken, TrackedEventMessage<?>>> events;

    @SneakyThrows
    public EmbeddedInMemoryEventStore() {
        super(STORAGE_ENGINE);
        final Field eventsField = InMemoryEventStorageEngine.class.getDeclaredField("events");
        eventsField.setAccessible(true);
        events = () -> {
            try {
                return (NavigableMap<TrackingToken, TrackedEventMessage<?>>) eventsField.get(STORAGE_ENGINE);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            }
        };
    }

    public void log() {
        final NavigableMap<TrackingToken, TrackedEventMessage<?>> map = events.get();
        final StringBuilder b = new StringBuilder("EmbeddedInMemoryEventStore{events=");

        for (TrackingToken t : map.navigableKeySet()) {
            TrackedEventMessage<?> v = map.get(t);

            b.append(String.format("\n\t[%03d] - %s",
                    ((GlobalSequenceTrackingToken)t).getGlobalIndex(),
                    v.getPayload()
            ));
        }
        b.append("\n}");

        log.info(b.toString());
    }
}