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 */
018
019package org.apache.hadoop.hbase.regionserver;
020
021import java.util.concurrent.ConcurrentHashMap;
022
023import org.apache.hadoop.hbase.metrics.BaseSourceImpl;
024import org.apache.hadoop.hbase.metrics.Interns;
025import org.apache.hadoop.metrics2.MetricsCollector;
026import org.apache.hadoop.metrics2.MetricsRecordBuilder;
027import org.apache.yetus.audience.InterfaceAudience;
028import org.slf4j.Logger;
029import org.slf4j.LoggerFactory;
030
031@InterfaceAudience.Private
032public class MetricsTableAggregateSourceImpl extends BaseSourceImpl
033        implements MetricsTableAggregateSource {
034
035  private static final Logger LOG = LoggerFactory.getLogger(MetricsTableAggregateSourceImpl.class);
036  private ConcurrentHashMap<String, MetricsTableSource> tableSources = new ConcurrentHashMap<>();
037
038  public MetricsTableAggregateSourceImpl() {
039    this(METRICS_NAME, METRICS_DESCRIPTION, METRICS_CONTEXT, METRICS_JMX_CONTEXT);
040  }
041
042  public MetricsTableAggregateSourceImpl(String metricsName,
043      String metricsDescription,
044      String metricsContext,
045      String metricsJmxContext) {
046    super(metricsName, metricsDescription, metricsContext, metricsJmxContext);
047  }
048
049  @Override
050  public void register(String table, MetricsTableSource source) {
051    tableSources.put(table, source);
052  }
053
054  @Override
055  public void deregister(String table) {
056    try {
057      tableSources.remove(table);
058    } catch (Exception e) {
059      // Ignored. If this errors out it means that someone is double
060      // closing the region source and the region is already nulled out.
061      LOG.info(
062        "Error trying to remove " + table + " from " + this.getClass().getSimpleName(),
063        e);
064    }
065  }
066
067  /**
068   * Yes this is a get function that doesn't return anything.  Thanks Hadoop for breaking all
069   * expectations of java programmers.  Instead of returning anything Hadoop metrics expects
070   * getMetrics to push the metrics into the collector.
071   *
072   * @param collector the collector
073   * @param all       get all the metrics regardless of when they last changed.
074   */
075  @Override
076  public void getMetrics(MetricsCollector collector, boolean all) {
077    MetricsRecordBuilder mrb = collector.addRecord(metricsName);
078
079    if (tableSources != null) {
080      for (MetricsTableSource tableMetricSource : tableSources.values()) {
081        if (tableMetricSource instanceof MetricsTableSourceImpl) {
082          ((MetricsTableSourceImpl) tableMetricSource).snapshot(mrb, all);
083        }
084      }
085      mrb.addGauge(Interns.info(NUM_TABLES, NUMBER_OF_TABLES_DESC), tableSources.size());
086      metricsRegistry.snapshot(mrb, all);
087    }
088  }
089}