import org.apache.cassandra.cache.ICache; //导入依赖的package包/类
/**
 * Create metrics for given cache.
 *
 * @param type Type of Cache to identify metrics.
 * @param cache Cache to measure metrics
 */
public CacheMetrics(String type, final ICache cache)
{
    capacity = Metrics.newGauge(new MetricName(GROUP_NAME, TYPE_NAME, "Capacity", type), new Gauge<Long>()
    {
        public Long value()
        {
            return cache.capacity();
        }
    });
    hits = Metrics.newMeter(new MetricName(GROUP_NAME, TYPE_NAME, "Hits", type), "hits", TimeUnit.SECONDS);
    requests = Metrics.newMeter(new MetricName(GROUP_NAME, TYPE_NAME, "Requests", type), "requests", TimeUnit.SECONDS);
    hitRate = Metrics.newGauge(new MetricName(GROUP_NAME, TYPE_NAME, "HitRate", type), new RatioGauge()
    {
        protected double getNumerator()
        {
            return hits.count();
        }

        protected double getDenominator()
        {
            return requests.count();
        }
    });
    size = Metrics.newGauge(new MetricName(GROUP_NAME, TYPE_NAME, "Size", type), new Gauge<Long>()
    {
        public Long value()
        {
            return cache.weightedSize();
        }
    });
    entries = Metrics.newGauge(new MetricName(GROUP_NAME, TYPE_NAME, "Entries", type), new Gauge<Integer>()
    {
        public Integer value()
        {
            return cache.size();
        }
    });
}
 

import org.apache.cassandra.cache.ICache; //导入依赖的package包/类
/**
 * Create metrics for given cache.
 *
 * @param type Type of Cache to identify metrics.
 * @param cache Cache to measure metrics
 */
public CacheMetrics(String type, final ICache cache)
{
    MetricNameFactory factory = new DefaultNameFactory("Cache", type);

    capacity = Metrics.newGauge(factory.createMetricName("Capacity"), new Gauge<Long>()
    {
        public Long value()
        {
            return cache.capacity();
        }
    });
    hits = Metrics.newMeter(factory.createMetricName("Hits"), "hits", TimeUnit.SECONDS);
    requests = Metrics.newMeter(factory.createMetricName("Requests"), "requests", TimeUnit.SECONDS);
    hitRate = Metrics.newGauge(factory.createMetricName("HitRate"), new RatioGauge()
    {
        protected double getNumerator()
        {
            return hits.count();
        }

        protected double getDenominator()
        {
            return requests.count();
        }
    });
    size = Metrics.newGauge(factory.createMetricName("Size"), new Gauge<Long>()
    {
        public Long value()
        {
            return cache.weightedSize();
        }
    });
    entries = Metrics.newGauge(factory.createMetricName("Entries"), new Gauge<Integer>()
    {
        public Integer value()
        {
            return cache.size();
        }
    });
}
 

import org.apache.cassandra.cache.ICache; //导入依赖的package包/类
/**
 * Create metrics for given cache.
 *
 * @param type Type of Cache to identify metrics.
 * @param cache Cache to measure metrics
 */
public CacheMetrics(String type, final ICache cache)
{
    MetricNameFactory factory = new DefaultNameFactory("Cache", type);

    capacity = Metrics.register(factory.createMetricName("Capacity"), new Gauge<Long>()
    {
        public Long getValue()
        {
            return cache.capacity();
        }
    });
    hits = Metrics.meter(factory.createMetricName("Hits"));
    requests = Metrics.meter(factory.createMetricName("Requests"));
    hitRate = Metrics.register(factory.createMetricName("HitRate"), new RatioGauge()
    {
        @Override
        public Ratio getRatio()
        {
            return Ratio.of(hits.getCount(), requests.getCount());
        }
    });
    oneMinuteHitRate = Metrics.register(factory.createMetricName("OneMinuteHitRate"), new RatioGauge()
    {
        protected Ratio getRatio()
        {
            return Ratio.of(hits.getOneMinuteRate(), requests.getOneMinuteRate());
        }
    });
    fiveMinuteHitRate = Metrics.register(factory.createMetricName("FiveMinuteHitRate"), new RatioGauge()
    {
        protected Ratio getRatio()
        {
            return Ratio.of(hits.getFiveMinuteRate(), requests.getFiveMinuteRate());
        }
    });
    fifteenMinuteHitRate = Metrics.register(factory.createMetricName("FifteenMinuteHitRate"), new RatioGauge()
    {
        protected Ratio getRatio()
        {
            return Ratio.of(hits.getFifteenMinuteRate(), requests.getFifteenMinuteRate());
        }
    });
    size = Metrics.register(factory.createMetricName("Size"), new Gauge<Long>()
    {
        public Long getValue()
        {
            return cache.weightedSize();
        }
    });
    entries = Metrics.register(factory.createMetricName("Entries"), new Gauge<Integer>()
    {
        public Integer getValue()
        {
            return cache.size();
        }
    });
}