// Validate the internal structure of the cache.
ensureCacheIntegrity(cache);
StatisticsSnapshot snapshotAfter = rootGroup.getStatisticsSnapshot();
StatisticsDelta delta = snapshotAfter.difference(snapshotBefore);
System.out.println("Period: " + delta.getPeriod());
System.out.println("Hit count: " + delta.getHitCount());
System.out.println("Missed / Added count: " + delta.getMissedAddedCount());
System.out.println("Removed count: " + delta.getRemovedCount());
System.out.println("Change count: " +