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A module that is everything required to understands Druid Segments
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/*
 * 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.druid.query;

import org.apache.druid.java.util.common.guava.LazySequence;
import org.apache.druid.java.util.common.guava.Sequence;
import org.apache.druid.java.util.common.guava.SequenceWrapper;
import org.apache.druid.java.util.common.guava.Sequences;
import org.apache.druid.java.util.common.logger.Logger;
import org.apache.druid.java.util.emitter.service.ServiceEmitter;
import org.apache.druid.query.context.ResponseContext;

import java.util.function.Consumer;
import java.util.function.ObjLongConsumer;

/**
 */
public class MetricsEmittingQueryRunner implements QueryRunner
{
  private final ServiceEmitter emitter;
  private final QueryToolChest> queryToolChest;
  private final QueryRunner queryRunner;
  private final long creationTimeNs;
  private final ObjLongConsumer> reportMetric;
  private final Consumer> applyCustomDimensions;
  private static final Logger log = new Logger(MetricsEmittingQueryRunner.class);

  private MetricsEmittingQueryRunner(
      ServiceEmitter emitter,
      QueryToolChest> queryToolChest,
      QueryRunner queryRunner,
      long creationTimeNs,
      ObjLongConsumer> reportMetric,
      Consumer> applyCustomDimensions
  )
  {
    this.emitter = emitter;
    this.queryToolChest = queryToolChest;
    this.queryRunner = queryRunner;
    this.creationTimeNs = creationTimeNs;
    this.reportMetric = reportMetric;
    this.applyCustomDimensions = applyCustomDimensions;
  }

  public MetricsEmittingQueryRunner(
      ServiceEmitter emitter,
      QueryToolChest> queryToolChest,
      QueryRunner queryRunner,
      ObjLongConsumer> reportMetric,
      Consumer> applyCustomDimensions
  )
  {
    this(emitter, queryToolChest, queryRunner, -1, reportMetric, applyCustomDimensions);
  }

  public MetricsEmittingQueryRunner withWaitMeasuredFromNow()
  {
    return new MetricsEmittingQueryRunner<>(
        emitter,
        queryToolChest,
        queryRunner,
        System.nanoTime(),
        reportMetric,
        applyCustomDimensions
    );
  }

  @Override
  public Sequence run(final QueryPlus queryPlus, final ResponseContext responseContext)
  {
    QueryPlus queryWithMetrics = queryPlus.withQueryMetrics(queryToolChest);
    final QueryMetrics queryMetrics = queryWithMetrics.getQueryMetrics();

    applyCustomDimensions.accept(queryMetrics);

    return Sequences.wrap(
        // Use LazySequence because want to account execution time of queryRunner.run() (it prepares the underlying
        // Sequence) as part of the reported query time, i. e. we want to execute queryRunner.run() after
        // `startTime = System.nanoTime();` (see below).
        new LazySequence<>(() -> queryRunner.run(queryWithMetrics, responseContext)),
        new SequenceWrapper()
        {
          private long startTimeNs;

          @Override
          public void before()
          {
            startTimeNs = System.nanoTime();
          }

          @Override
          public void after(boolean isDone, Throwable thrown)
          {
            if (thrown != null) {
              queryMetrics.status("failed");
            } else if (!isDone) {
              queryMetrics.status("short");
            }
            long timeTakenNs = System.nanoTime() - startTimeNs;
            reportMetric.accept(queryMetrics, timeTakenNs);

            if (creationTimeNs > 0) {
              queryMetrics.reportWaitTime(startTimeNs - creationTimeNs);
            }
            try {
              queryMetrics.emit(emitter);
            }
            catch (Exception e) {
              // Query should not fail, because of emitter failure. Swallowing the exception.
              log.error("Failure while trying to emit [%s] with stacktrace [%s]", emitter.toString(), e);
            }
          }
        }
    );
  }
}