| /* |
| * 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.List; |
| import java.util.concurrent.TimeUnit; |
| |
| import com.codahale.metrics.Counter; |
| import com.codahale.metrics.Timer; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.Lists; |
| |
| import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics; |
| |
| |
| /** |
| * Metrics about latencies |
| */ |
| public class LatencyMetrics |
| { |
| /** Latency */ |
| public final Timer latency; |
| /** Total latency in micro sec */ |
| public final Counter totalLatency; |
| |
| /** parent metrics to replicate any updates to **/ |
| private List<LatencyMetrics> parents = 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; |
| |
| if (aliasFactory == null) |
| { |
| latency = Metrics.timer(factory.createMetricName(namePrefix + "Latency")); |
| totalLatency = Metrics.counter(factory.createMetricName(namePrefix + "TotalLatency")); |
| } |
| else |
| { |
| latency = Metrics.timer(factory.createMetricName(namePrefix + "Latency"), aliasFactory.createMetricName(namePrefix + "Latency")); |
| totalLatency = Metrics.counter(factory.createMetricName(namePrefix + "TotalLatency"), aliasFactory.createMetricName(namePrefix + "TotalLatency")); |
| } |
| } |
| |
| /** |
| * 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.addAll(ImmutableList.copyOf(parents)); |
| } |
| |
| /** takes nanoseconds **/ |
| public void addNano(long nanos) |
| { |
| // convert to microseconds. 1 millionth |
| latency.update(nanos, TimeUnit.NANOSECONDS); |
| totalLatency.inc(nanos / 1000); |
| for(LatencyMetrics parent : parents) |
| { |
| parent.addNano(nanos); |
| } |
| } |
| |
| public void release() |
| { |
| 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")); |
| } |
| } |
| } |