| /* |
| * 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.rya.indexing.entity; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static com.google.common.base.Preconditions.checkState; |
| |
| import org.apache.hadoop.conf.Configurable; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.log4j.Logger; |
| import org.apache.rya.indexing.entity.model.Entity; |
| import org.apache.rya.indexing.entity.query.EntityQueryNode; |
| import org.apache.rya.indexing.entity.storage.EntityStorage; |
| import org.apache.rya.indexing.entity.storage.EntityStorage.EntityStorageException; |
| import org.apache.rya.indexing.entity.storage.TypeStorage; |
| import org.apache.rya.indexing.entity.update.mongo.MongoEntityIndexer; |
| import org.apache.rya.indexing.external.matching.AbstractExternalSetOptimizer; |
| import org.apache.rya.indexing.external.matching.ExternalSetMatcher; |
| import org.apache.rya.indexing.external.matching.ExternalSetProvider; |
| import org.apache.rya.indexing.external.matching.QueryNodeListRater; |
| import org.apache.rya.indexing.external.matching.QuerySegment; |
| import org.apache.rya.indexing.external.matching.TopOfQueryFilterRelocator; |
| import org.apache.rya.mongodb.StatefulMongoDBRdfConfiguration; |
| import org.eclipse.rdf4j.query.BindingSet; |
| import org.eclipse.rdf4j.query.Dataset; |
| import org.eclipse.rdf4j.query.algebra.TupleExpr; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Optional; |
| |
| /** |
| * Optimizes a query over {@link Entity}s. |
| */ |
| public class EntityIndexOptimizer extends AbstractExternalSetOptimizer<EntityQueryNode> implements Configurable { |
| private static final Logger log = Logger.getLogger(EntityIndexOptimizer.class); |
| private static final EntityExternalSetMatcherFactory MATCHER_FACTORY = new EntityExternalSetMatcherFactory(); |
| |
| private final MongoEntityIndexer indexer; |
| private EntityIndexSetProvider provider; |
| private Configuration conf; |
| |
| private EntityStorage entityStorage; |
| private TypeStorage typeStorage; |
| |
| /** |
| * Creates a new {@link EntityIndexOptimizer}. |
| */ |
| public EntityIndexOptimizer() { |
| indexer = new MongoEntityIndexer(); |
| |
| //There is no rater for entity query nodes. |
| useOptimal = false; |
| } |
| |
| @Override |
| public void setConf(final Configuration conf) { |
| checkState(conf instanceof StatefulMongoDBRdfConfiguration, |
| "The provided Configuration must be of type StatefulMongoDBRdfConfiguration, but was " + conf.getClass().getName()); |
| |
| this.conf = conf; |
| indexer.setConf(conf); |
| indexer.init(); |
| |
| typeStorage = indexer.getTypeStorage(); |
| try { |
| entityStorage = indexer.getEntityStorage(); |
| } catch (final EntityStorageException e) { |
| log.error("Error getting entity storage", e); |
| } |
| |
| provider = new EntityIndexSetProvider(typeStorage, entityStorage); |
| } |
| |
| @Override |
| public Configuration getConf() { |
| return conf; |
| } |
| |
| @Override |
| public void optimize(TupleExpr tupleExpr, final Dataset dataset, final BindingSet bindings) { |
| checkNotNull(tupleExpr); |
| checkNotNull(indexer); |
| |
| // first standardize query by pulling all filters to top of query if |
| // they exist using TopOfQueryFilterRelocator |
| tupleExpr = TopOfQueryFilterRelocator.moveFiltersToTop(tupleExpr); |
| super.optimize(tupleExpr, null, null); |
| } |
| |
| @VisibleForTesting |
| public EntityStorage getEntityStorage() { |
| return entityStorage; |
| } |
| |
| @VisibleForTesting |
| public TypeStorage getTypeStorage() { |
| return typeStorage; |
| } |
| |
| /** |
| * Visits a node of the query tree. Checks to see if the node belongs |
| * or is of an {@link Entity}. If it is, prepares it, so after the query |
| * is checked, the nodes can be replaced with {@link EntityQueryNode}s. |
| */ |
| |
| @Override |
| protected ExternalSetMatcher<EntityQueryNode> getMatcher(final QuerySegment<EntityQueryNode> segment) { |
| return MATCHER_FACTORY.getMatcher(segment); |
| } |
| |
| @Override |
| protected ExternalSetProvider<EntityQueryNode> getProvider() { |
| return provider; |
| } |
| |
| @Override |
| protected Optional<QueryNodeListRater> getNodeListRater(final QuerySegment<EntityQueryNode> segment) { |
| return Optional.absent(); |
| } |
| } |