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A module that is everything required to understands Druid Segments

There is a newer version: 30.0.1

/*
 * 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.ForwardingListeningExecutorService;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;

import java.util.concurrent.ExecutorService;

/**
 * Default implementation of {@link QueryProcessingPool} that just forwards operations, including query execution tasks,
 * to an underlying {@link ExecutorService}
 */
public class ForwardingQueryProcessingPool extends ForwardingListeningExecutorService implements QueryProcessingPool
{
  private final ListeningExecutorService delegate;

  public ForwardingQueryProcessingPool(ExecutorService executorService)
  {
    this.delegate = MoreExecutors.listeningDecorator(executorService);
  }

  @Override
  public  ListenableFuture submitRunnerTask(PrioritizedQueryRunnerCallable task)
  {
    return delegate().submit(task);
  }

  @Override
  protected ListeningExecutorService delegate()
  {
    return delegate;
  }

}