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.CompatibilitySingletonFactory;
024import org.apache.hadoop.hbase.metrics.BaseSourceImpl;
025import org.apache.hadoop.hbase.metrics.Interns;
026import org.apache.hadoop.metrics2.MetricsCollector;
027import org.apache.hadoop.metrics2.MetricsRecordBuilder;
028import org.apache.yetus.audience.InterfaceAudience;
029import org.slf4j.Logger;
030import org.slf4j.LoggerFactory;
031
032@InterfaceAudience.Private
033public class MetricsTableAggregateSourceImpl extends BaseSourceImpl
034        implements MetricsTableAggregateSource {
035
036  private static final Logger LOG = LoggerFactory.getLogger(MetricsTableAggregateSourceImpl.class);
037  private ConcurrentHashMap<String, MetricsTableSource> tableSources = new ConcurrentHashMap<>();
038
039  public MetricsTableAggregateSourceImpl() {
040    this(METRICS_NAME, METRICS_DESCRIPTION, METRICS_CONTEXT, METRICS_JMX_CONTEXT);
041  }
042
043  public MetricsTableAggregateSourceImpl(String metricsName,
044      String metricsDescription,
045      String metricsContext,
046      String metricsJmxContext) {
047    super(metricsName, metricsDescription, metricsContext, metricsJmxContext);
048  }
049
050  private void register(MetricsTableSource source) {
051    source.registerMetrics();
052  }
053
054  @Override
055  public void deleteTableSource(String table) {
056    try {
057      MetricsTableSource source = tableSources.remove(table);
058      if (source != null) {
059        source.close();
060      }
061    } catch (Exception e) {
062      // Ignored. If this errors out it means that someone is double
063      // closing the user source and the user metrics is already nulled out.
064      LOG.info("Error trying to remove " + table + " from " + getClass().getSimpleName(), e);
065    }
066  }
067
068  @Override
069  public MetricsTableSource getOrCreateTableSource(String table,
070      MetricsTableWrapperAggregate wrapper) {
071    MetricsTableSource source = tableSources.get(table);
072    if (source != null) {
073      return source;
074    }
075    MetricsTableSource newSource = CompatibilitySingletonFactory
076      .getInstance(MetricsRegionServerSourceFactory.class).createTable(table, wrapper);
077    return tableSources.computeIfAbsent(table, k -> {
078      // register the new metrics now
079      newSource.registerMetrics();
080      return newSource;
081    });
082  }
083
084  /**
085   * Yes this is a get function that doesn't return anything.  Thanks Hadoop for breaking all
086   * expectations of java programmers.  Instead of returning anything Hadoop metrics expects
087   * getMetrics to push the metrics into the collector.
088   *
089   * @param collector the collector
090   * @param all       get all the metrics regardless of when they last changed.
091   */
092  @Override
093  public void getMetrics(MetricsCollector collector, boolean all) {
094    MetricsRecordBuilder mrb = collector.addRecord(metricsName);
095    if (tableSources != null) {
096      for (MetricsTableSource tableMetricSource : tableSources.values()) {
097        if (tableMetricSource instanceof MetricsTableSourceImpl) {
098          ((MetricsTableSourceImpl) tableMetricSource).snapshot(mrb, all);
099        }
100      }
101      mrb.addGauge(Interns.info(NUM_TABLES, NUMBER_OF_TABLES_DESC), tableSources.size());
102      metricsRegistry.snapshot(mrb, all);
103    }
104  }
105}