Github user isper3at commented on a diff in the pull request: https://github.com/apache/incubator-rya/pull/172#discussion_r160534831 --- Diff: extras/indexing/src/main/java/org/apache/rya/indexing/pcj/matching/provider/AbstractPcjIndexSetProvider.java --- @@ -0,0 +1,160 @@ +/* + * 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 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) { + requireNonNull(conf); --- End diff -- a lot of these look like I did them, its just a repackage
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