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A module that is everything required to understands Druid Segments

There is a newer version: 31.0.0

/*
 * 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 com.google.common.util.concurrent.ListeningExecutorService;
import org.apache.druid.java.util.emitter.service.ServiceEmitter;
import org.apache.druid.java.util.emitter.service.ServiceMetricEvent;

public class MetricsEmittingQueryProcessingPool extends ForwardingQueryProcessingPool
    implements ExecutorServiceMonitor.MetricEmitter
{

  public MetricsEmittingQueryProcessingPool(
      ListeningExecutorService delegate,
      ExecutorServiceMonitor executorServiceMonitor
  )
  {
    super(delegate);
    executorServiceMonitor.add(this);
  }

  @Override
  public void emitMetrics(ServiceEmitter emitter, ServiceMetricEvent.Builder metricBuilder)
  {
    if (delegate() instanceof PrioritizedExecutorService) {
      emitter.emit(metricBuilder.setMetric("segment/scan/pending", ((PrioritizedExecutorService) delegate()).getQueueSize()));
      emitter.emit(metricBuilder.setMetric("segment/scan/active", ((PrioritizedExecutorService) delegate()).getActiveTasks()));
    }
  }

}