| /* |
| * 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.query.groupby.strategy.GroupByStrategySelector; |
| import org.apache.druid.segment.Segment; |
| import org.apache.druid.segment.StorageAdapter; |
| |
| /** |
| * |
| */ |
| public class GroupByQueryRunnerFactory implements QueryRunnerFactory<ResultRow, GroupByQuery> |
| { |
| private final GroupByStrategySelector strategySelector; |
| private final GroupByQueryQueryToolChest toolChest; |
| |
| @Inject |
| public GroupByQueryRunnerFactory( |
| GroupByStrategySelector strategySelector, |
| GroupByQueryQueryToolChest toolChest |
| ) |
| { |
| this.strategySelector = strategySelector; |
| this.toolChest = toolChest; |
| } |
| |
| @Override |
| public QueryRunner<ResultRow> createRunner(final Segment segment) |
| { |
| return new GroupByQueryRunner(segment, strategySelector); |
| } |
| |
| @Override |
| public QueryRunner<ResultRow> mergeRunners( |
| final QueryProcessingPool queryProcessingPool, |
| final Iterable<QueryRunner<ResultRow>> queryRunners |
| ) |
| { |
| return new QueryRunner<ResultRow>() |
| { |
| @Override |
| public Sequence<ResultRow> run(QueryPlus<ResultRow> queryPlus, ResponseContext responseContext) |
| { |
| QueryRunner<ResultRow> rowQueryRunner = strategySelector |
| .strategize((GroupByQuery) queryPlus.getQuery()) |
| .mergeRunners(queryProcessingPool, queryRunners); |
| return rowQueryRunner.run(queryPlus, responseContext); |
| } |
| }; |
| } |
| |
| @Override |
| public QueryToolChest<ResultRow, GroupByQuery> getToolchest() |
| { |
| return toolChest; |
| } |
| |
| private static class GroupByQueryRunner implements QueryRunner<ResultRow> |
| { |
| 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<ResultRow> run(QueryPlus<ResultRow> queryPlus, ResponseContext responseContext) |
| { |
| Query<ResultRow> 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); |
| } |
| } |
| |
| @VisibleForTesting |
| public GroupByStrategySelector getStrategySelector() |
| { |
| return strategySelector; |
| } |
| } |