| /* |
| * 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.solr.ltr; |
| |
| import org.apache.solr.search.SolrIndexSearcher; |
| |
| /** |
| * FeatureLogger can be registered in a model and provide a strategy for logging |
| * the feature values. |
| */ |
| public abstract class FeatureLogger { |
| |
| /** the name of the cache using for storing the feature value **/ |
| private final String fvCacheName; |
| |
| public enum FeatureFormat {DENSE, SPARSE}; |
| protected final FeatureFormat featureFormat; |
| |
| protected FeatureLogger(String fvCacheName, FeatureFormat f) { |
| this.fvCacheName = fvCacheName; |
| this.featureFormat = f; |
| } |
| |
| /** |
| * Log will be called every time that the model generates the feature values |
| * for a document and a query. |
| * |
| * @param docid |
| * Solr document id whose features we are saving |
| * @param featuresInfo |
| * List of all the {@link LTRScoringQuery.FeatureInfo} objects which contain name and value |
| * for all the features triggered by the result set |
| * @return true if the logger successfully logged the features, false |
| * otherwise. |
| */ |
| |
| public boolean log(int docid, LTRScoringQuery scoringQuery, |
| SolrIndexSearcher searcher, LTRScoringQuery.FeatureInfo[] featuresInfo) { |
| final String featureVector = makeFeatureVector(featuresInfo); |
| if (featureVector == null) { |
| return false; |
| } |
| |
| return searcher.cacheInsert(fvCacheName, |
| fvCacheKey(scoringQuery, docid), featureVector) != null; |
| } |
| |
| public abstract String makeFeatureVector(LTRScoringQuery.FeatureInfo[] featuresInfo); |
| |
| private static int fvCacheKey(LTRScoringQuery scoringQuery, int docid) { |
| return scoringQuery.hashCode() + (31 * docid); |
| } |
| |
| /** |
| * populate the document with its feature vector |
| * |
| * @param docid |
| * Solr document id |
| * @return String representation of the list of features calculated for docid |
| */ |
| |
| public String getFeatureVector(int docid, LTRScoringQuery scoringQuery, |
| SolrIndexSearcher searcher) { |
| return (String) searcher.cacheLookup(fvCacheName, fvCacheKey(scoringQuery, docid)); |
| } |
| |
| } |