| /* |
| * 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.pcj.matching.provider; |
| |
| import static java.util.Objects.requireNonNull; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.log4j.Logger; |
| import org.apache.rya.api.instance.RyaDetails; |
| import org.apache.rya.indexing.IndexPlanValidator.IndexedExecutionPlanGenerator; |
| import org.apache.rya.indexing.IndexPlanValidator.ValidIndexCombinationGenerator; |
| import org.apache.rya.indexing.external.matching.ExternalSetProvider; |
| import org.apache.rya.indexing.external.matching.QuerySegment; |
| import org.apache.rya.indexing.external.tupleSet.ExternalTupleSet; |
| import org.apache.rya.indexing.pcj.matching.PCJOptimizerUtilities; |
| import org.apache.rya.indexing.pcj.matching.PCJToSegmentConverter; |
| import org.openrdf.query.algebra.TupleExpr; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| |
| /** |
| * Abstraction of {@link ExternalSetProvider} that provides {@link ExternalTupleSet}s. |
| * Implementations of this use either a user specified configuration information or user a specified |
| * List of ExternalTupleSets to populate an internal cache of ExternalTupleSets. If a configuration |
| * is provided, the provider connects to an instance of RyaDetails and populates the cache with |
| * PCJs registered in RyaDetails. |
| */ |
| public abstract class AbstractPcjIndexSetProvider implements ExternalSetProvider<ExternalTupleSet> { |
| protected static final Logger log = Logger.getLogger(AbstractPcjIndexSetProvider.class); |
| protected static final PCJToSegmentConverter converter = new PCJToSegmentConverter(); |
| protected List<ExternalTupleSet> indexCache; |
| protected final Configuration conf; |
| protected boolean init = false; |
| |
| /** |
| * Creates a new {@link AbstractPcjIndexSetProvider} based on configuration only. |
| * @param conf - The {@link Configuration} used to connect to {@link RyaDetails}. |
| */ |
| public AbstractPcjIndexSetProvider(final Configuration conf) { |
| this.conf = requireNonNull(conf); |
| } |
| |
| /** |
| * Creates a new {@link AbstractPcjIndexSetProvider} based user provided {@link ExternalTupleSet}s. |
| * @param conf - The {@link Configuration} used to connect to {@link RyaDetails}. |
| * @param indices - The {@link ExternalTupleSet}s to populate the internal cache. |
| */ |
| public AbstractPcjIndexSetProvider(final Configuration conf, final List<ExternalTupleSet> indices) { |
| requireNonNull(conf); |
| this.conf = conf; |
| indexCache = indices; |
| init = true; |
| } |
| |
| |
| /** |
| * |
| * @param indices |
| */ |
| @VisibleForTesting |
| public void setIndices(final List<ExternalTupleSet> indices) { |
| indexCache = indices; |
| init = true; |
| } |
| |
| /** |
| * @param segment - QuerySegment used to get relevant queries form index cache for matching |
| * |
| * @return Iterator of Lists (combos) of PCJs used to build an optimal query plan |
| */ |
| @Override |
| public Iterator<List<ExternalTupleSet>> getExternalSetCombos(final QuerySegment<ExternalTupleSet> segment) { |
| final ValidIndexCombinationGenerator comboGen = new ValidIndexCombinationGenerator(segment.getOrderedNodes()); |
| return comboGen.getValidIndexCombos(getExternalSets(segment)); |
| } |
| |
| /** |
| * @param segment - QuerySegment used to get relevant queries form index cache for matching |
| * @return List of PCJs for matching |
| */ |
| @Override |
| public List<ExternalTupleSet> getExternalSets(final QuerySegment<ExternalTupleSet> segment) { |
| try { |
| if(!init) { |
| indexCache = PCJOptimizerUtilities.getValidPCJs(getIndices()); |
| init = true; |
| } |
| final TupleExpr query = segment.getQuery().getTupleExpr(); |
| final IndexedExecutionPlanGenerator iep = new IndexedExecutionPlanGenerator(query, indexCache); |
| final List<ExternalTupleSet> pcjs = iep.getNormalizedIndices(); |
| final List<ExternalTupleSet> tuples = new ArrayList<>(); |
| for (final ExternalTupleSet tuple: pcjs) { |
| final QuerySegment<ExternalTupleSet> pcj = converter.setToSegment(tuple); |
| if (segment.containsQuerySegment(pcj)) { |
| tuples.add(tuple); |
| } |
| } |
| return tuples; |
| |
| } catch (final Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| /** |
| * @return The size of the set index cache. |
| * @throws Exception |
| */ |
| public int size() throws Exception { |
| if (!init) { |
| indexCache = PCJOptimizerUtilities.getValidPCJs(getIndices()); |
| init = true; |
| } |
| return indexCache.size(); |
| } |
| |
| /** |
| * @param conf - client configuration |
| * @return - list of {@link ExternalTupleSet}s or PCJs that are either |
| * specified by user in Configuration or exist in system. |
| * |
| * @throws Exception |
| */ |
| protected abstract List<ExternalTupleSet> getIndices() throws PcjIndexSetException; |
| |
| /** |
| * Exception thrown when failing to get the defined PCJS for a particular |
| * index. |
| */ |
| public class PcjIndexSetException extends Exception { |
| public PcjIndexSetException(final String message) { |
| super(message); |
| } |
| |
| public PcjIndexSetException(final String message, final Throwable cause) { |
| super(message, cause); |
| } |
| } |
| } |