io.druid.query.groupby.GroupByQueryRunnerFactory 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.groupby;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.inject.Inject;
import io.druid.data.input.Row;
import io.druid.java.util.common.ISE;
import io.druid.java.util.common.guava.Sequence;
import io.druid.query.Query;
import io.druid.query.QueryPlus;
import io.druid.query.QueryRunner;
import io.druid.query.QueryRunnerFactory;
import io.druid.query.QueryToolChest;
import io.druid.query.groupby.strategy.GroupByStrategySelector;
import io.druid.segment.Segment;
import io.druid.segment.StorageAdapter;
import java.util.Map;
import java.util.concurrent.ExecutorService;
/**
*/
public class GroupByQueryRunnerFactory implements QueryRunnerFactory
{
private final GroupByStrategySelector strategySelector;
private final GroupByQueryQueryToolChest toolChest;
@Inject
public GroupByQueryRunnerFactory(
GroupByStrategySelector strategySelector,
GroupByQueryQueryToolChest toolChest
)
{
this.strategySelector = strategySelector;
this.toolChest = toolChest;
}
@Override
public QueryRunner createRunner(final Segment segment)
{
return new GroupByQueryRunner(segment, strategySelector);
}
@Override
public QueryRunner mergeRunners(final ExecutorService exec, final Iterable> queryRunners)
{
// mergeRunners should take ListeningExecutorService at some point
final ListeningExecutorService queryExecutor = MoreExecutors.listeningDecorator(exec);
return new QueryRunner()
{
@Override
public Sequence run(QueryPlus queryPlus, Map responseContext)
{
QueryRunner rowQueryRunner = strategySelector.strategize((GroupByQuery) queryPlus.getQuery()).mergeRunners(
queryExecutor,
queryRunners
);
return rowQueryRunner.run(queryPlus, responseContext);
}
};
}
@Override
public QueryToolChest getToolchest()
{
return toolChest;
}
private static class GroupByQueryRunner implements QueryRunner
{
private final StorageAdapter adapter;
private final GroupByStrategySelector strategySelector;
public GroupByQueryRunner(Segment segment, final GroupByStrategySelector strategySelector)
{
this.adapter = segment.asStorageAdapter();
this.strategySelector = strategySelector;
}
@Override
public Sequence run(QueryPlus queryPlus, Map 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 strategySelector.strategize((GroupByQuery) query).process((GroupByQuery) query, adapter);
}
}
}