code: public double getCacheHitRatio() {
  		return this.cacheHits.get()+this.cacheMiss.get() == 0 ? 0 : this.cacheHits.get() / (1.0*this.cacheHits.get()+this.cacheMiss.get());
  	}
docs: /* (non-Javadoc)
  @see com.jolbox.bonecp.StatisticsMBean#getCacheHitRatio()