@Override
    public void executeRevert(long targetEpoch, Delta delta) {
        IntegerContainer container = (IntegerContainer) delta;
        this.value = container.value;
    }
This is a mutable integer which can be snapshotted. 
<br>
This class requires external synchronization.
server-common/src/main/java/org/apache/kafka/timeline/TimelineInteger.java