io.druid.extension.lucene.LuceneQueryToolChest.java Source code

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Here is the source code for io.druid.extension.lucene.LuceneQueryToolChest.java

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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.extension.lucene;

import com.fasterxml.jackson.core.type.TypeReference;
import com.google.common.base.Function;
import com.google.common.base.Functions;
import com.google.common.collect.Ordering;
import com.metamx.common.guava.nary.BinaryFn;
import com.metamx.emitter.service.ServiceMetricEvent;

import io.druid.common.utils.JodaUtils;
import io.druid.query.DruidMetrics;
import io.druid.query.Query;
import io.druid.query.QueryRunner;
import io.druid.query.QueryToolChest;
import io.druid.query.Result;
import io.druid.query.ResultMergeQueryRunner;
import io.druid.query.aggregation.MetricManipulationFn;

import javax.annotation.Nullable;

public class LuceneQueryToolChest extends QueryToolChest<Result<LuceneQueryResultValue>, LuceneDruidQuery> {
    @Override
    public QueryRunner<Result<LuceneQueryResultValue>> mergeResults(
            final QueryRunner<Result<LuceneQueryResultValue>> baseRunner)

    {
        return new ResultMergeQueryRunner<Result<LuceneQueryResultValue>>(baseRunner) {
            @Override
            protected Ordering<Result<LuceneQueryResultValue>> makeOrdering(
                    final Query<Result<LuceneQueryResultValue>> query) {
                return (Ordering) Ordering.allEqual().nullsFirst();
            }

            @Override
            protected BinaryFn<Result<LuceneQueryResultValue>, Result<LuceneQueryResultValue>, Result<LuceneQueryResultValue>> createMergeFn(
                    final Query<Result<LuceneQueryResultValue>> query) {
                return new BinaryFn<Result<LuceneQueryResultValue>, Result<LuceneQueryResultValue>, Result<LuceneQueryResultValue>>() {
                    @Override
                    public Result<LuceneQueryResultValue> apply(@Nullable Result<LuceneQueryResultValue> result1,
                            @Nullable Result<LuceneQueryResultValue> result2) {
                        if (result1 == null) {
                            return result2;
                        } else if (result2 == null) {
                            return result1;
                        } else {
                            return new Result<>(
                                    JodaUtils.minDateTime(result1.getTimestamp(), result2.getTimestamp()),
                                    new LuceneQueryResultValue(
                                            result1.getValue().getSize() + result1.getValue().getSize(),
                                            result1.getValue().getCount() + result2.getValue().getCount()));
                        }
                    }
                };
            }
        };
    }

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

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

    @Override
    public TypeReference<Result<LuceneQueryResultValue>> getResultTypeReference() {
        return new TypeReference<Result<LuceneQueryResultValue>>() {
        };
    }
}