001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.metrics.impl;
019
020import java.util.Map;
021import java.util.Optional;
022import java.util.concurrent.ConcurrentHashMap;
023import java.util.concurrent.ConcurrentMap;
024
025import org.apache.hadoop.hbase.metrics.Counter;
026import org.apache.hadoop.hbase.metrics.Gauge;
027import org.apache.hadoop.hbase.metrics.Histogram;
028import org.apache.hadoop.hbase.metrics.Meter;
029import org.apache.hadoop.hbase.metrics.Metric;
030import org.apache.hadoop.hbase.metrics.MetricRegistry;
031import org.apache.hadoop.hbase.metrics.MetricRegistryInfo;
032import org.apache.hadoop.hbase.metrics.MetricSet;
033import org.apache.hadoop.hbase.metrics.Timer;
034import org.apache.hadoop.hbase.util.ConcurrentMapUtils;
035import org.apache.yetus.audience.InterfaceAudience;
036
037/**
038 * Custom implementation of {@link MetricRegistry}.
039 */
040@InterfaceAudience.Private
041public class MetricRegistryImpl implements MetricRegistry {
042
043  private final MetricRegistryInfo info;
044
045  private final ConcurrentMap<String, Metric> metrics;
046
047  public MetricRegistryImpl(MetricRegistryInfo info) {
048    this.info = info;
049    this.metrics = new ConcurrentHashMap<>();
050  }
051
052  @Override
053  public Timer timer(String name) {
054    return (Timer) ConcurrentMapUtils.computeIfAbsent(metrics, name, this::createTimer);
055  }
056
057  protected Timer createTimer() {
058    return new TimerImpl();
059  }
060
061  @Override
062  public Histogram histogram(String name) {
063    return (Histogram) ConcurrentMapUtils.computeIfAbsent(metrics, name, this::createHistogram);
064  }
065
066  protected Histogram createHistogram() {
067    return new HistogramImpl();
068  }
069
070  @Override
071  public Meter meter(String name) {
072    return (Meter) ConcurrentMapUtils.computeIfAbsent(metrics, name, this::createMeter);
073  }
074
075  protected Meter createMeter() {
076    return new DropwizardMeter();
077  }
078
079  @Override
080  public Counter counter(String name) {
081    return (Counter) ConcurrentMapUtils.computeIfAbsent(metrics, name, this::createCounter);
082  }
083
084  protected Counter createCounter() {
085    return new CounterImpl();
086  }
087
088  @Override
089  public Optional<Metric> get(String name) {
090    return Optional.ofNullable(metrics.get(name));
091  }
092
093  @Override
094  public Metric register(String name, Metric metric) {
095    return ConcurrentMapUtils.computeIfAbsent(metrics, name, () -> metric);
096  }
097
098  @Override
099  public <T> Gauge<T> register(String name, Gauge<T> gauge) {
100    return (Gauge) register(name, (Metric)gauge);
101  }
102
103  @Override
104  public void registerAll(MetricSet metricSet) {
105    metricSet.getMetrics().forEach(this::register);
106  }
107
108  @Override
109  public Map<String, Metric> getMetrics() {
110    return metrics;
111  }
112
113  @Override
114  public boolean remove(String name) {
115    return metrics.remove(name) != null;
116  }
117
118  @Override
119  public MetricRegistryInfo getMetricRegistryInfo() {
120    return info;
121  }
122}