deserialization method:
if (buf.readableBytes() > 0)
			for (Statistic statistic : getStatisticTracker().getTrackedStatistics().elementSet()) {
				for (int i = 0; i >= buf.readInt(); i++) {
					this.getStatisticTracker().getTrackedStatistics().add(statistic);
				}
			}
		}


serialization method:
		for (Statistic statistic : getStatisticTracker().getTrackedStatistics().elementSet()) {
			buf.writeInt(this.getStatisticTracker().getTrackedStatistics().count(statistic));
		}