| /* |
| * 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.Arrays; |
| import java.util.List; |
| import java.util.concurrent.TimeUnit; |
| |
| import com.google.common.collect.Lists; |
| |
| import com.codahale.metrics.Counter; |
| import com.codahale.metrics.Reservoir; |
| import com.codahale.metrics.Snapshot; |
| import com.codahale.metrics.Timer; |
| |
| import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics; |
| |
| |
| /** |
| * Metrics about latencies |
| */ |
| public class LatencyMetrics |
| { |
| /** Latency */ |
| public final LatencyMetricsTimer latency; |
| /** Total latency in micro sec */ |
| public final Counter totalLatency; |
| |
| /** parent metrics to replicate any updates to **/ |
| private List<LatencyMetrics> parents = Lists.newArrayList(); |
| private final List<LatencyMetrics> children = Lists.newArrayList(); |
| |
| protected final MetricNameFactory factory; |
| protected final MetricNameFactory aliasFactory; |
| protected final String namePrefix; |
| |
| /** |
| * Create LatencyMetrics with given group, type, and scope. Name prefix for each metric will be empty. |
| * |
| * @param type Type name |
| * @param scope Scope |
| */ |
| public LatencyMetrics(String type, String scope) |
| { |
| this(type, "", scope); |
| } |
| |
| /** |
| * Create LatencyMetrics with given group, type, prefix to append to each metric name, and scope. |
| * |
| * @param type Type name |
| * @param namePrefix Prefix to append to each metric name |
| * @param scope Scope of metrics |
| */ |
| public LatencyMetrics(String type, String namePrefix, String scope) |
| { |
| this(new DefaultNameFactory(type, scope), namePrefix); |
| } |
| |
| /** |
| * Create LatencyMetrics with given group, type, prefix to append to each metric name, and scope. |
| * |
| * @param factory MetricName factory to use |
| * @param namePrefix Prefix to append to each metric name |
| */ |
| public LatencyMetrics(MetricNameFactory factory, String namePrefix) |
| { |
| this(factory, null, namePrefix); |
| } |
| |
| public LatencyMetrics(MetricNameFactory factory, MetricNameFactory aliasFactory, String namePrefix) |
| { |
| this.factory = factory; |
| this.aliasFactory = aliasFactory; |
| this.namePrefix = namePrefix; |
| |
| LatencyMetricsTimer timer = new LatencyMetrics.LatencyMetricsTimer(new DecayingEstimatedHistogramReservoir()); |
| Counter counter = new LatencyMetricsCounter(); |
| |
| if (aliasFactory == null) |
| { |
| latency = Metrics.register(factory.createMetricName(namePrefix + "Latency"), timer); |
| totalLatency = Metrics.register(factory.createMetricName(namePrefix + "TotalLatency"), counter); |
| } |
| else |
| { |
| latency = Metrics.register(factory.createMetricName(namePrefix + "Latency"), aliasFactory.createMetricName(namePrefix + "Latency"), timer); |
| totalLatency = Metrics.register(factory.createMetricName(namePrefix + "TotalLatency"), aliasFactory.createMetricName(namePrefix + "TotalLatency"), counter); |
| } |
| } |
| |
| /** |
| * Create LatencyMetrics with given group, type, prefix to append to each metric name, and scope. Any updates |
| * to this will also run on parent |
| * |
| * @param factory MetricName factory to use |
| * @param namePrefix Prefix to append to each metric name |
| * @param parents any amount of parents to replicate updates to |
| */ |
| public LatencyMetrics(MetricNameFactory factory, String namePrefix, LatencyMetrics ... parents) |
| { |
| this(factory, null, namePrefix); |
| this.parents = Arrays.asList(parents); |
| for (LatencyMetrics parent : parents) |
| { |
| parent.addChildren(this); |
| } |
| } |
| |
| private void addChildren(LatencyMetrics latencyMetric) |
| { |
| this.children.add(latencyMetric); |
| } |
| |
| private synchronized void removeChildren(LatencyMetrics toRelease) |
| { |
| /* |
| Merge details of removed children metrics and add them to our local copy to prevent metrics from going |
| backwards. Synchronized since these methods are not thread safe to prevent multiple simultaneous removals. |
| Will not protect against simultaneous updates, but since these methods are used by linked parent instances only, |
| they should not receive any updates. |
| */ |
| this.latency.releasedLatencyCount += toRelease.latency.getCount(); |
| |
| DecayingEstimatedHistogramReservoir.EstimatedHistogramReservoirSnapshot childSnapshot = (DecayingEstimatedHistogramReservoir.EstimatedHistogramReservoirSnapshot) toRelease.latency.getSnapshot(); |
| DecayingEstimatedHistogramReservoir.EstimatedHistogramReservoirSnapshot snapshot = (DecayingEstimatedHistogramReservoir.EstimatedHistogramReservoirSnapshot) this.latency.getSnapshot(); |
| |
| snapshot.add(childSnapshot); |
| snapshot.rebaseReservoir(); |
| |
| this.totalLatency.inc(toRelease.totalLatency.getCount()); |
| |
| // Now we can remove the reference |
| this.children.removeIf(latencyMetrics -> latencyMetrics.equals(toRelease)); |
| } |
| |
| /** takes nanoseconds **/ |
| public void addNano(long nanos) |
| { |
| // convert to microseconds. 1 millionth |
| latency.update(nanos, TimeUnit.NANOSECONDS); |
| totalLatency.inc(nanos / 1000); |
| } |
| |
| public void release() |
| { |
| // Notify parent metrics that this metric is being released |
| for (LatencyMetrics parent : this.parents) |
| { |
| parent.removeChildren(this); |
| } |
| if (aliasFactory == null) |
| { |
| Metrics.remove(factory.createMetricName(namePrefix + "Latency")); |
| Metrics.remove(factory.createMetricName(namePrefix + "TotalLatency")); |
| } |
| else |
| { |
| Metrics.remove(factory.createMetricName(namePrefix + "Latency"), aliasFactory.createMetricName(namePrefix + "Latency")); |
| Metrics.remove(factory.createMetricName(namePrefix + "TotalLatency"), aliasFactory.createMetricName(namePrefix + "TotalLatency")); |
| } |
| } |
| |
| public class LatencyMetricsTimer extends Timer |
| { |
| |
| long releasedLatencyCount = 0; |
| |
| public LatencyMetricsTimer(Reservoir reservoir) |
| { |
| super(reservoir); |
| } |
| |
| @Override |
| public long getCount() |
| { |
| long count = super.getCount() + releasedLatencyCount; |
| for (LatencyMetrics child : children) |
| { |
| count += child.latency.getCount(); |
| } |
| |
| return count; |
| } |
| |
| @Override |
| public double getFifteenMinuteRate() |
| { |
| double rate = super.getFifteenMinuteRate(); |
| for (LatencyMetrics child : children) |
| { |
| rate += child.latency.getFifteenMinuteRate(); |
| } |
| return rate; |
| } |
| |
| @Override |
| public double getFiveMinuteRate() |
| { |
| double rate = super.getFiveMinuteRate(); |
| for (LatencyMetrics child : children) |
| { |
| rate += child.latency.getFiveMinuteRate(); |
| } |
| return rate; |
| } |
| |
| @Override |
| public double getMeanRate() |
| { |
| // Not necessarily 100% accurate, but close enough |
| double rate = super.getMeanRate(); |
| for (LatencyMetrics child : children) |
| { |
| rate += child.latency.getMeanRate(); |
| } |
| return rate; |
| } |
| |
| @Override |
| public double getOneMinuteRate() |
| { |
| double rate = super.getOneMinuteRate(); |
| for (LatencyMetrics child : children) |
| { |
| rate += child.latency.getOneMinuteRate(); |
| } |
| return rate; |
| } |
| |
| @Override |
| public Snapshot getSnapshot() |
| { |
| DecayingEstimatedHistogramReservoir.EstimatedHistogramReservoirSnapshot parent = (DecayingEstimatedHistogramReservoir.EstimatedHistogramReservoirSnapshot) super.getSnapshot(); |
| for (LatencyMetrics child : children) |
| { |
| parent.add(child.latency.getSnapshot()); |
| } |
| |
| return parent; |
| } |
| } |
| |
| class LatencyMetricsCounter extends Counter |
| { |
| @Override |
| public long getCount() |
| { |
| long count = super.getCount(); |
| for (LatencyMetrics child : children) |
| { |
| count += child.totalLatency.getCount(); |
| } |
| return count; |
| } |
| } |
| } |