package org.apache.lucene.benchmark.byTask.feeds;
/*
* 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.io.IOException;
import java.util.List;
import java.util.Random;
import org.apache.lucene.benchmark.byTask.utils.Config;
import org.apache.lucene.facet.taxonomy.CategoryPath;
/**
* 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.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 maxValue = maxDocFacets * maxFacetDepth;
@Override
public void getNextFacets(List<CategoryPath> 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 = 1 + random.nextInt(maxFacetDepth); // depth 0 is not useful
String[] components = new String[depth];
for (int k = 0; k < depth; k++) {
components[k] = Integer.toString(random.nextInt(maxValue));
addItem();
}
CategoryPath cp = new CategoryPath(components);
facets.add(cp);
addBytes(cp.toString().length()); // very rough approximation
}
}
@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);
maxFacetDepth = config.get("max.facet.depth", 3);
maxValue = maxDocFacets * maxFacetDepth;
}
}