| /* |
| * 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.lucene.benchmark.byTask.feeds; |
| |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.Random; |
| import org.apache.lucene.benchmark.byTask.utils.Config; |
| import org.apache.lucene.facet.FacetField; |
| import org.apache.lucene.facet.FacetsConfig; |
| |
| /** |
| * Simple implementation of a random facet source |
| * |
| * <p>Supports the following parameters: |
| * |
| * <ul> |
| * <li><b>rand.seed</b> - defines the seed to initialize {@link Random} with (default: <b>13</b>). |
| * <li><b>max.doc.facet.dims</b> - Max number of random dimensions to create (default: <b>5</b>); |
| * actual number of dimensions would be anything between 1 and that number. |
| * <li><b>max.doc.facets</b> - maximal #facets per doc (default: <b>10</b>). Actual number of |
| * facets in a certain doc would be anything between 1 and that number. |
| * <li><b>max.facet.depth</b> - maximal #components in a facet (default: <b>3</b>). Actual number |
| * of components in a certain facet would be anything between 1 and that number. |
| * </ul> |
| */ |
| public class RandomFacetSource extends FacetSource { |
| |
| private Random random; |
| private int maxDocFacets; |
| private int maxFacetDepth; |
| private int maxDims; |
| private int maxValue = maxDocFacets * maxFacetDepth; |
| |
| @Override |
| public void getNextFacets(List<FacetField> facets) throws NoMoreDataException, IOException { |
| facets.clear(); |
| int numFacets = 1 + random.nextInt(maxDocFacets); // at least one facet to each doc |
| for (int i = 0; i < numFacets; i++) { |
| int depth; |
| if (maxFacetDepth == 2) { |
| depth = 2; |
| } else { |
| depth = 2 + random.nextInt(maxFacetDepth - 2); // depth < 2 is not useful |
| } |
| |
| String dim = Integer.toString(random.nextInt(maxDims)); |
| String[] components = new String[depth - 1]; |
| for (int k = 0; k < depth - 1; k++) { |
| components[k] = Integer.toString(random.nextInt(maxValue)); |
| addItem(); |
| } |
| FacetField ff = new FacetField(dim, components); |
| facets.add(ff); |
| addBytes(ff.toString().length()); // very rough approximation |
| } |
| } |
| |
| @Override |
| public void configure(FacetsConfig config) { |
| for (int i = 0; i < maxDims; i++) { |
| config.setHierarchical(Integer.toString(i), true); |
| config.setMultiValued(Integer.toString(i), true); |
| } |
| } |
| |
| @Override |
| public void close() throws IOException { |
| // nothing to do here |
| } |
| |
| @Override |
| public void setConfig(Config config) { |
| super.setConfig(config); |
| random = new Random(config.get("rand.seed", 13)); |
| maxDocFacets = config.get("max.doc.facets", 10); |
| maxDims = config.get("max.doc.facets.dims", 5); |
| maxFacetDepth = config.get("max.facet.depth", 3); |
| if (maxFacetDepth < 2) { |
| throw new IllegalArgumentException( |
| "max.facet.depth must be at least 2; got: " + maxFacetDepth); |
| } |
| maxValue = maxDocFacets * maxFacetDepth; |
| } |
| } |