io.druid.server.ClientQuerySegmentWalker Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of druid-server Show documentation
Druid Server
The newest version!
/*
 * Druid - a distributed column store.
 * Copyright (C) 2012, 2013  Metamarkets Group Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package io.druid.server;

import com.google.common.base.Function;
import com.google.inject.Inject;
import com.metamx.emitter.service.ServiceEmitter;
import com.metamx.emitter.service.ServiceMetricEvent;
import io.druid.client.CachingClusteredClient;
import io.druid.query.FinalizeResultsQueryRunner;
import io.druid.query.MetricsEmittingQueryRunner;
import io.druid.query.Query;
import io.druid.query.QueryRunner;
import io.druid.query.QuerySegmentWalker;
import io.druid.query.QueryToolChest;
import io.druid.query.QueryToolChestWarehouse;
import io.druid.query.SegmentDescriptor;
import org.joda.time.Interval;

import javax.annotation.Nullable;

/**
*/
public class ClientQuerySegmentWalker implements QuerySegmentWalker
{
  private final ServiceEmitter emitter;
  private final CachingClusteredClient baseClient;
  private final QueryToolChestWarehouse warehouse;

  @Inject
  public ClientQuerySegmentWalker(
      ServiceEmitter emitter,
      CachingClusteredClient baseClient,
      QueryToolChestWarehouse warehouse
  )
  {
    this.emitter = emitter;
    this.baseClient = baseClient;
    this.warehouse = warehouse;
  }

  @Override
  public  QueryRunner getQueryRunnerForIntervals(Query query, Iterable intervals)
  {
    return makeRunner(query);
  }

  @Override
  public  QueryRunner getQueryRunnerForSegments(Query query, Iterable specs)
  {
    return makeRunner(query);
  }

  private  FinalizeResultsQueryRunner makeRunner(final Query query)
  {
    final QueryToolChest> toolChest = warehouse.getToolChest(query);
    return new FinalizeResultsQueryRunner(
        toolChest.postMergeQueryDecoration(
            toolChest.mergeResults(
                new MetricsEmittingQueryRunner(
                    emitter,
                    new Function, ServiceMetricEvent.Builder>()
                    {
                      @Override
                      public ServiceMetricEvent.Builder apply(@Nullable Query input)
                      {
                        return toolChest.makeMetricBuilder(query);
                      }
                    },
                    toolChest.preMergeQueryDecoration(baseClient)
                ).withWaitMeasuredFromNow()
            )
        ),
        toolChest
    );
  }
}