| package org.apache.rya.api.persist.query.join; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Map; |
| |
| import org.apache.rya.api.RdfCloudTripleStoreConfiguration; |
| import org.apache.rya.api.RdfCloudTripleStoreUtils; |
| import org.apache.rya.api.domain.RyaStatement; |
| import org.apache.rya.api.domain.RyaType; |
| import org.apache.rya.api.domain.RyaURI; |
| import org.apache.rya.api.persist.RyaDAOException; |
| import org.apache.rya.api.persist.query.RyaQueryEngine; |
| import org.apache.rya.api.resolver.RyaContext; |
| import org.eclipse.rdf4j.common.iteration.CloseableIteration; |
| import org.eclipse.rdf4j.common.iteration.ConvertingIteration; |
| import org.eclipse.rdf4j.query.BindingSet; |
| |
| import com.google.common.base.Preconditions; |
| |
| /** |
| * Date: 7/24/12 |
| * Time: 8:52 AM |
| */ |
| public class IterativeJoin<C extends RdfCloudTripleStoreConfiguration> implements Join<C> { |
| |
| private RyaContext ryaContext = RyaContext.getInstance(); |
| private RyaQueryEngine ryaQueryEngine; |
| |
| public IterativeJoin() { |
| } |
| |
| public IterativeJoin(RyaQueryEngine ryaQueryEngine) { |
| this.ryaQueryEngine = ryaQueryEngine; |
| } |
| |
| /** |
| * Return all statements that have input predicates. Predicates must not be null or ranges |
| * |
| * @param preds |
| * @return |
| */ |
| @Override |
| public CloseableIteration<RyaStatement, RyaDAOException> join(C conf, RyaURI... preds) |
| throws RyaDAOException { |
| Preconditions.checkNotNull(preds); |
| Preconditions.checkArgument(preds.length > 1, "Must join 2 or more"); |
| //TODO: Reorder predObjs based on statistics |
| |
| CloseableIteration<RyaStatement, RyaDAOException> iter = null; |
| for (RyaURI pred : preds) { |
| if (iter == null) { |
| iter = ryaQueryEngine.query(new RyaStatement(null, pred, null), null); |
| } else { |
| iter = join(iter, pred); |
| } |
| } |
| |
| return iter; |
| } |
| |
| /** |
| * Return all subjects that have the predicate objects associated. Predicate and objects must be not null or ranges |
| * to ensure sorting |
| * |
| * @param predObjs |
| * @return |
| * @throws org.apache.rya.api.persist.RyaDAOException |
| * |
| */ |
| @Override |
| public CloseableIteration<RyaURI, RyaDAOException> join(C conf, Map.Entry<RyaURI, RyaType>... predObjs) |
| throws RyaDAOException { |
| Preconditions.checkNotNull(predObjs); |
| Preconditions.checkArgument(predObjs.length > 1, "Must join 2 or more"); |
| |
| //TODO: Reorder predObjs based on statistics |
| CloseableIteration<RyaStatement, RyaDAOException> first = null; |
| CloseableIteration<RyaURI, RyaDAOException> iter = null; |
| for (Map.Entry<RyaURI, RyaType> entry : predObjs) { |
| if (first == null) { |
| first = ryaQueryEngine.query(new RyaStatement(null, entry.getKey(), entry.getValue()), null); |
| } else if (iter == null) { |
| iter = join(new ConvertingIteration<RyaStatement, RyaURI, RyaDAOException>(first) { |
| |
| @Override |
| protected RyaURI convert(RyaStatement statement) throws RyaDAOException { |
| return statement.getSubject(); |
| } |
| }, entry); |
| } else { |
| iter = join(iter, entry); |
| } |
| } |
| |
| return iter; |
| } |
| |
| protected CloseableIteration<RyaURI, RyaDAOException> join(final CloseableIteration<RyaURI, RyaDAOException> iteration, |
| final Map.Entry<RyaURI, RyaType> predObj) { |
| //TODO: configure batch |
| //TODO: batch = 1, does not work |
| final int batch = 100; |
| return new CloseableIteration<RyaURI, RyaDAOException>() { |
| |
| private CloseableIteration<Map.Entry<RyaStatement, BindingSet>, RyaDAOException> query; |
| |
| @Override |
| public void close() throws RyaDAOException { |
| iteration.close(); |
| if (query != null) { |
| query.close(); |
| } |
| } |
| |
| @Override |
| public boolean hasNext() throws RyaDAOException { |
| return !(query == null || !query.hasNext()) || batchNext(); |
| } |
| |
| @Override |
| public RyaURI next() throws RyaDAOException { |
| if (query == null || !query.hasNext()) { |
| if (!batchNext()) return null; |
| } |
| if (query != null && query.hasNext()) { |
| return query.next().getKey().getSubject(); |
| } else { |
| return null; |
| } |
| } |
| |
| private boolean batchNext() throws RyaDAOException { |
| if (!iteration.hasNext()) { |
| return false; |
| } |
| Collection<Map.Entry<RyaStatement, BindingSet>> batchedResults = new ArrayList<Map.Entry<RyaStatement, BindingSet>>(); |
| for (int i = 0; i < batch && iteration.hasNext(); i++) { |
| batchedResults.add(new RdfCloudTripleStoreUtils.CustomEntry<RyaStatement, BindingSet>( |
| new RyaStatement(iteration.next(), predObj.getKey(), predObj.getValue()), null)); |
| } |
| query = ryaQueryEngine.queryWithBindingSet(batchedResults, null); |
| return query.hasNext(); |
| } |
| |
| @Override |
| public void remove() throws RyaDAOException { |
| this.next(); |
| } |
| }; |
| } |
| |
| protected CloseableIteration<RyaStatement, RyaDAOException> join( |
| final CloseableIteration<RyaStatement, RyaDAOException> iteration, final RyaURI pred) { |
| //TODO: configure batch |
| //TODO: batch = 1, does not work |
| final int batch = 100; |
| return new CloseableIteration<RyaStatement, RyaDAOException>() { |
| |
| private CloseableIteration<Map.Entry<RyaStatement, BindingSet>, RyaDAOException> query; |
| |
| @Override |
| public void close() throws RyaDAOException { |
| iteration.close(); |
| if (query != null) { |
| query.close(); |
| } |
| } |
| |
| @Override |
| public boolean hasNext() throws RyaDAOException { |
| return !(query == null || !query.hasNext()) || batchNext(); |
| } |
| |
| @Override |
| public RyaStatement next() throws RyaDAOException { |
| if (query == null || !query.hasNext()) { |
| if (!batchNext()) return null; |
| } |
| if (query != null && query.hasNext()) { |
| return query.next().getKey(); |
| } else { |
| return null; |
| } |
| } |
| |
| private boolean batchNext() throws RyaDAOException { |
| if (!iteration.hasNext()) { |
| return false; |
| } |
| Collection<Map.Entry<RyaStatement, BindingSet>> batchedResults = new ArrayList<Map.Entry<RyaStatement, BindingSet>>(); |
| for (int i = 0; i < batch && iteration.hasNext(); i++) { |
| RyaStatement next = iteration.next(); |
| batchedResults.add(new RdfCloudTripleStoreUtils.CustomEntry<RyaStatement, BindingSet>( |
| new RyaStatement(next.getSubject(), pred, next.getObject()), null)); |
| } |
| query = ryaQueryEngine.queryWithBindingSet(batchedResults, null); |
| return query.hasNext(); |
| } |
| |
| @Override |
| public void remove() throws RyaDAOException { |
| this.next(); |
| } |
| }; |
| } |
| |
| public RyaQueryEngine getRyaQueryEngine() { |
| return ryaQueryEngine; |
| } |
| |
| public void setRyaQueryEngine(RyaQueryEngine ryaQueryEngine) { |
| this.ryaQueryEngine = ryaQueryEngine; |
| } |
| } |