org.apache.druid.query.topn.TopNQueryRunnerFactory Maven / Gradle / Ivy
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A module that is everything required to understands Druid Segments
/*
* 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.topn;
import com.google.inject.Inject;
import org.apache.druid.collections.NonBlockingPool;
import org.apache.druid.guice.annotations.Global;
import org.apache.druid.java.util.common.ISE;
import org.apache.druid.java.util.common.guava.Sequence;
import org.apache.druid.query.ChainedExecutionQueryRunner;
import org.apache.druid.query.QueryPlus;
import org.apache.druid.query.QueryProcessingPool;
import org.apache.druid.query.QueryRunner;
import org.apache.druid.query.QueryRunnerFactory;
import org.apache.druid.query.QueryToolChest;
import org.apache.druid.query.QueryWatcher;
import org.apache.druid.query.Result;
import org.apache.druid.query.context.ResponseContext;
import org.apache.druid.segment.Segment;
import java.nio.ByteBuffer;
/**
*/
public class TopNQueryRunnerFactory implements QueryRunnerFactory, TopNQuery>
{
private final NonBlockingPool computationBufferPool;
private final TopNQueryQueryToolChest toolchest;
private final QueryWatcher queryWatcher;
@Inject
public TopNQueryRunnerFactory(
@Global NonBlockingPool computationBufferPool,
TopNQueryQueryToolChest toolchest,
QueryWatcher queryWatcher
)
{
this.computationBufferPool = computationBufferPool;
this.toolchest = toolchest;
this.queryWatcher = queryWatcher;
}
@Override
public QueryRunner> createRunner(final Segment segment)
{
final TopNQueryEngine queryEngine = new TopNQueryEngine(computationBufferPool);
return new QueryRunner>()
{
@Override
public Sequence> run(
QueryPlus> input,
ResponseContext responseContext
)
{
if (!(input.getQuery() instanceof TopNQuery)) {
throw new ISE("Got a [%s] which isn't a %s", input.getClass(), TopNQuery.class);
}
TopNQuery query = (TopNQuery) input.getQuery();
return queryEngine.query(query, segment.asStorageAdapter(), (TopNQueryMetrics) input.getQueryMetrics());
}
};
}
@Override
public QueryRunner> mergeRunners(
QueryProcessingPool queryProcessingPool,
Iterable>> queryRunners
)
{
return new ChainedExecutionQueryRunner<>(queryProcessingPool, queryWatcher, queryRunners);
}
@Override
public QueryToolChest, TopNQuery> getToolchest()
{
return toolchest;
}
}