| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.cassandra.metrics; |
| |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| import com.codahale.metrics.Gauge; |
| import com.codahale.metrics.Meter; |
| import com.codahale.metrics.RatioGauge; |
| import org.apache.cassandra.cache.ICache; |
| |
| import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics; |
| |
| /** |
| * Metrics for {@code ICache}. |
| */ |
| public class CacheMetrics |
| { |
| /** Cache capacity in bytes */ |
| public final Gauge<Long> capacity; |
| /** Total number of cache hits */ |
| public final Meter hits; |
| /** Total number of cache requests */ |
| public final Meter requests; |
| /** all time cache hit rate */ |
| public final Gauge<Double> hitRate; |
| /** 1m hit rate */ |
| public final Gauge<Double> oneMinuteHitRate; |
| /** 5m hit rate */ |
| public final Gauge<Double> fiveMinuteHitRate; |
| /** 15m hit rate */ |
| public final Gauge<Double> fifteenMinuteHitRate; |
| /** Total size of cache, in bytes */ |
| public final Gauge<Long> size; |
| /** Total number of cache entries */ |
| public final Gauge<Integer> entries; |
| |
| /** |
| * 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(); |
| } |
| }); |
| } |
| } |