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    • io.druid.query.select.SelectQueryQueryToolChest Maven / Gradle / Ivy

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    /*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.query.select;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Function;
import com.google.common.base.Functions;
import com.google.common.collect.Ordering;
import com.google.common.collect.Sets;
import com.google.inject.Inject;
import com.metamx.common.StringUtils;
import com.metamx.common.guava.nary.BinaryFn;
import com.metamx.emitter.service.ServiceMetricEvent;
import io.druid.granularity.QueryGranularity;
import io.druid.query.CacheStrategy;
import io.druid.query.DruidMetrics;
import io.druid.query.IntervalChunkingQueryRunnerDecorator;
import io.druid.query.Query;
import io.druid.query.QueryRunner;
import io.druid.query.QueryToolChest;
import io.druid.query.Result;
import io.druid.query.ResultGranularTimestampComparator;
import io.druid.query.ResultMergeQueryRunner;
import io.druid.query.aggregation.MetricManipulationFn;
import io.druid.query.filter.DimFilter;
import org.joda.time.DateTime;

import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 */
public class SelectQueryQueryToolChest extends QueryToolChest, SelectQuery>
{
  private static final byte SELECT_QUERY = 0x13;
  private static final TypeReference OBJECT_TYPE_REFERENCE =
      new TypeReference()
      {
      };
  private static final TypeReference> TYPE_REFERENCE =
      new TypeReference>()
      {
      };

  private final ObjectMapper jsonMapper;

  private final IntervalChunkingQueryRunnerDecorator intervalChunkingQueryRunnerDecorator;

  @Inject
  public SelectQueryQueryToolChest(ObjectMapper jsonMapper,
      IntervalChunkingQueryRunnerDecorator intervalChunkingQueryRunnerDecorator)
  {
    this.jsonMapper = jsonMapper;
    this.intervalChunkingQueryRunnerDecorator = intervalChunkingQueryRunnerDecorator;
  }

  @Override
  public QueryRunner> mergeResults(
      QueryRunner> queryRunner
  )
  {
    return new ResultMergeQueryRunner>(queryRunner)
    {
      @Override
      protected Ordering> makeOrdering(Query> query)
      {
        return ResultGranularTimestampComparator.create(
            ((SelectQuery) query).getGranularity(), query.isDescending()
        );
      }

      @Override
      protected BinaryFn, Result, Result> createMergeFn(
          Query> input
      )
      {
        SelectQuery query = (SelectQuery) input;
        return new SelectBinaryFn(
            query.getGranularity(),
            query.getPagingSpec(),
            query.isDescending()
        );
      }
    };
  }

  @Override
  public ServiceMetricEvent.Builder makeMetricBuilder(SelectQuery query)
  {
    return DruidMetrics.makePartialQueryTimeMetric(query);
  }

  @Override
  public Function, Result> makePreComputeManipulatorFn(
      final SelectQuery query, final MetricManipulationFn fn
  )
  {
    return Functions.identity();
  }

  @Override
  public TypeReference> getResultTypeReference()
  {
    return TYPE_REFERENCE;
  }

  @Override
  public CacheStrategy, Object, SelectQuery> getCacheStrategy(final SelectQuery query)
  {
    return new CacheStrategy, Object, SelectQuery>()
    {
      @Override
      public byte[] computeCacheKey(SelectQuery query)
      {
        final DimFilter dimFilter = query.getDimensionsFilter();
        final byte[] filterBytes = dimFilter == null ? new byte[]{} : dimFilter.getCacheKey();
        final byte[] granularityBytes = query.getGranularity().cacheKey();

        final Set dimensions = Sets.newTreeSet();
        if (query.getDimensions() != null) {
          dimensions.addAll(query.getDimensions());
        }

        final byte[][] dimensionsBytes = new byte[dimensions.size()][];
        int dimensionsBytesSize = 0;
        int index = 0;
        for (String dimension : dimensions) {
          dimensionsBytes[index] = StringUtils.toUtf8(dimension);
          dimensionsBytesSize += dimensionsBytes[index].length;
          ++index;
        }

        final Set metrics = Sets.newTreeSet();
        if (query.getMetrics() != null) {
          metrics.addAll(query.getMetrics());
        }

        final byte[][] metricBytes = new byte[metrics.size()][];
        int metricBytesSize = 0;
        index = 0;
        for (String metric : metrics) {
          metricBytes[index] = StringUtils.toUtf8(metric);
          metricBytesSize += metricBytes[index].length;
          ++index;
        }

        final ByteBuffer queryCacheKey = ByteBuffer
            .allocate(
                1
                + granularityBytes.length
                + filterBytes.length
                + query.getPagingSpec().getCacheKey().length
                + dimensionsBytesSize
                + metricBytesSize
            )
            .put(SELECT_QUERY)
            .put(granularityBytes)
            .put(filterBytes)
            .put(query.getPagingSpec().getCacheKey());

        for (byte[] dimensionsByte : dimensionsBytes) {
          queryCacheKey.put(dimensionsByte);
        }

        for (byte[] metricByte : metricBytes) {
          queryCacheKey.put(metricByte);
        }

        return queryCacheKey.array();
      }

      @Override
      public TypeReference getCacheObjectClazz()
      {
        return OBJECT_TYPE_REFERENCE;
      }

      @Override
      public Function, Object> prepareForCache()
      {
        return new Function, Object>()
        {
          @Override
          public Object apply(final Result input)
          {
            return Arrays.asList(
                input.getTimestamp().getMillis(),
                input.getValue().getPagingIdentifiers(),
                input.getValue().getEvents()
            );
          }
        };
      }

      @Override
      public Function> pullFromCache()
      {
        return new Function>()
        {
          private final QueryGranularity granularity = query.getGranularity();

          @Override
          public Result apply(Object input)
          {
            List results = (List) input;
            Iterator resultIter = results.iterator();

            DateTime timestamp = granularity.toDateTime(((Number) resultIter.next()).longValue());

            return new Result(
                timestamp,
                new SelectResultValue(
                    (Map) jsonMapper.convertValue(
                        resultIter.next(), new TypeReference>()
                        {
                        }
                    ),
                    (List) jsonMapper.convertValue(
                        resultIter.next(), new TypeReference>()
                        {
                        }
                    )
                )
            );
          }
        };
      }
    };
  }

  @Override
  public QueryRunner> preMergeQueryDecoration(QueryRunner> runner)
  {
    return intervalChunkingQueryRunnerDecorator.decorate(runner, this);
  }
}
    
    
    
    

    




    
    
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