0f044e2f47
Move the Scylla JMX code under "com.scylladb.jmx" package. Signed-off-by: Pekka Enberg <penberg@scylladb.com>
123 lines
4.2 KiB
Java
123 lines
4.2 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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/*
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* Copyright 2015 Cloudius Systems
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*
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* Modified by Cloudius Systems
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*/
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package org.apache.cassandra.metrics;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicLong;
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import com.scylladb.jmx.api.APIClient;
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import com.scylladb.jmx.metrics.APIMetrics;
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import com.scylladb.jmx.metrics.DefaultNameFactory;
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import com.scylladb.jmx.metrics.MetricNameFactory;
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import com.yammer.metrics.core.Gauge;
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import com.yammer.metrics.core.Meter;
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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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/** 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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/** cache hit rate */
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public final Gauge<Double> hitRate;
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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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private final AtomicLong lastRequests = new AtomicLong(0);
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private final AtomicLong lastHits = new AtomicLong(0);
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private APIClient c = new APIClient();
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/**
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* Create metrics for given cache.
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*
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* @param type
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* Type of Cache to identify metrics.
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* @param cache
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* Cache to measure metrics
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*/
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public CacheMetrics(String type, final String url) {
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MetricNameFactory factory = new DefaultNameFactory("Cache", type);
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capacity = APIMetrics.newGauge(factory.createMetricName("Capacity"),
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new Gauge<Long>() {
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public Long value() {
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return c.getLongValue("/cache_service/metrics/" + url
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+ "/capacity");
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}
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});
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hits = APIMetrics.newMeter("/cache_service/metrics/" + url
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+ "/hits", factory.createMetricName("Hits"), "hits",
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TimeUnit.SECONDS);
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requests = APIMetrics.newMeter("/cache_service/metrics/" + url
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+ "/requests", factory.createMetricName("Requests"),
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"requests", TimeUnit.SECONDS);
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hitRate = APIMetrics.newGauge(factory.createMetricName("HitRate"),
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new Gauge<Double>() {
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@Override
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public Double value() {
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return c.getDoubleValue("/cache_service/metrics/" + url
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+ "/hit_rate");
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}
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});
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size = APIMetrics.newGauge(factory.createMetricName("Size"),
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new Gauge<Long>() {
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public Long value() {
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return c.getLongValue("/cache_service/metrics/" + url
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+ "/size");
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}
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});
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entries = APIMetrics.newGauge(factory.createMetricName("Entries"),
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new Gauge<Integer>() {
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public Integer value() {
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return c.getIntValue("/cache_service/metrics/" + url
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+ "/entries");
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}
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});
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}
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// for backward compatibility
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@Deprecated
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public double getRecentHitRate() {
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long r = requests.count();
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long h = hits.count();
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try
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{
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return ((double)(h - lastHits.get())) / (r - lastRequests.get());
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}
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finally
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{
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lastRequests.set(r);
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lastHits.set(h);
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}
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}
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}
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