mirror of https://github.com/apache/cassandra
117 lines
4.0 KiB
Java
117 lines
4.0 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.cassandra.metrics;
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import java.util.concurrent.atomic.AtomicLong;
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import com.codahale.metrics.Gauge;
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import com.codahale.metrics.Meter;
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import com.codahale.metrics.RatioGauge;
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import org.apache.cassandra.cache.ICache;
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import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics;
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/**
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* Metrics for {@code ICache}.
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*/
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public class CacheMetrics
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{
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/** Cache capacity in bytes */
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public final Gauge<Long> capacity;
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/** Total number of cache hits */
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public final Meter hits;
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/** Total number of cache requests */
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public final Meter requests;
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/** all time cache hit rate */
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public final Gauge<Double> hitRate;
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/** 1m hit rate */
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public final Gauge<Double> oneMinuteHitRate;
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/** 5m hit rate */
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public final Gauge<Double> fiveMinuteHitRate;
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/** 15m hit rate */
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public final Gauge<Double> fifteenMinuteHitRate;
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/** Total size of cache, in bytes */
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public final Gauge<Long> size;
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/** Total number of cache entries */
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public final Gauge<Integer> entries;
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/**
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* Create metrics for given cache.
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*
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* @param type Type of Cache to identify metrics.
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* @param cache Cache to measure metrics
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*/
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public CacheMetrics(String type, final ICache cache)
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{
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MetricNameFactory factory = new DefaultNameFactory("Cache", type);
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capacity = Metrics.register(factory.createMetricName("Capacity"), new Gauge<Long>()
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{
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public Long getValue()
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{
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return cache.capacity();
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}
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});
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hits = Metrics.meter(factory.createMetricName("Hits"));
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requests = Metrics.meter(factory.createMetricName("Requests"));
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hitRate = Metrics.register(factory.createMetricName("HitRate"), new RatioGauge()
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{
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@Override
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public Ratio getRatio()
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{
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return Ratio.of(hits.getCount(), requests.getCount());
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}
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});
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oneMinuteHitRate = Metrics.register(factory.createMetricName("OneMinuteHitRate"), new RatioGauge()
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{
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protected Ratio getRatio()
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{
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return Ratio.of(hits.getOneMinuteRate(), requests.getOneMinuteRate());
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}
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});
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fiveMinuteHitRate = Metrics.register(factory.createMetricName("FiveMinuteHitRate"), new RatioGauge()
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{
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protected Ratio getRatio()
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{
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return Ratio.of(hits.getFiveMinuteRate(), requests.getFiveMinuteRate());
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}
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});
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fifteenMinuteHitRate = Metrics.register(factory.createMetricName("FifteenMinuteHitRate"), new RatioGauge()
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{
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protected Ratio getRatio()
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{
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return Ratio.of(hits.getFifteenMinuteRate(), requests.getFifteenMinuteRate());
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}
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});
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size = Metrics.register(factory.createMetricName("Size"), new Gauge<Long>()
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{
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public Long getValue()
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{
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return cache.weightedSize();
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}
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});
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entries = Metrics.register(factory.createMetricName("Entries"), new Gauge<Integer>()
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{
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public Integer getValue()
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{
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return cache.size();
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}
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});
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}
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}
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