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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.groupby;
import com.google.common.annotations.VisibleForTesting;
import com.google.inject.Inject;
import org.apache.druid.java.util.common.ISE;
import org.apache.druid.java.util.common.guava.Sequence;
import org.apache.druid.query.Query;
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.context.ResponseContext;
import org.apache.druid.segment.Segment;
import org.apache.druid.segment.StorageAdapter;
/**
*
*/
public class GroupByQueryRunnerFactory implements QueryRunnerFactory
{
private final GroupingEngine groupingEngine;
private final GroupByQueryQueryToolChest toolChest;
@Inject
public GroupByQueryRunnerFactory(
GroupingEngine groupingEngine,
GroupByQueryQueryToolChest toolChest
)
{
this.groupingEngine = groupingEngine;
this.toolChest = toolChest;
}
@Override
public QueryRunner createRunner(final Segment segment)
{
return new GroupByQueryRunner(segment, groupingEngine);
}
@Override
public QueryRunner mergeRunners(
final QueryProcessingPool queryProcessingPool,
final Iterable> queryRunners
)
{
return new QueryRunner()
{
@Override
public Sequence run(QueryPlus queryPlus, ResponseContext responseContext)
{
QueryRunner rowQueryRunner = groupingEngine.mergeRunners(queryProcessingPool, queryRunners);
return rowQueryRunner.run(queryPlus, responseContext);
}
};
}
@Override
public QueryToolChest getToolchest()
{
return toolChest;
}
private static class GroupByQueryRunner implements QueryRunner
{
private final StorageAdapter adapter;
private final GroupingEngine groupingEngine;
public GroupByQueryRunner(Segment segment, final GroupingEngine groupingEngine)
{
this.adapter = segment.asStorageAdapter();
this.groupingEngine = groupingEngine;
}
@Override
public Sequence run(QueryPlus queryPlus, ResponseContext responseContext)
{
Query query = queryPlus.getQuery();
if (!(query instanceof GroupByQuery)) {
throw new ISE("Got a [%s] which isn't a %s", query.getClass(), GroupByQuery.class);
}
return groupingEngine.process((GroupByQuery) query, adapter, (GroupByQueryMetrics) queryPlus.getQueryMetrics());
}
}
@VisibleForTesting
public GroupingEngine getGroupingEngine()
{
return groupingEngine;
}
}