| /* |
| * 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.monitor; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.search.Query; |
| |
| /** |
| * Class used to match candidate queries selected by a Presearcher from a Monitor |
| * query index. |
| */ |
| public abstract class CandidateMatcher<T extends QueryMatch> { |
| |
| /** |
| * The searcher to run candidate queries against |
| */ |
| protected final IndexSearcher searcher; |
| |
| private final Map<String, Exception> errors = new HashMap<>(); |
| private final List<MatchHolder<T>> matches; |
| |
| private long searchTime = System.nanoTime(); |
| |
| private static class MatchHolder<T> { |
| Map<String, T> matches = new HashMap<>(); |
| } |
| |
| /** |
| * Creates a new CandidateMatcher for the supplied DocumentBatch |
| * |
| * @param searcher the IndexSearcher to run queries against |
| */ |
| public CandidateMatcher(IndexSearcher searcher) { |
| this.searcher = searcher; |
| int docCount = searcher.getIndexReader().maxDoc(); |
| this.matches = new ArrayList<>(docCount); |
| for (int i = 0; i < docCount; i++) { |
| this.matches.add(new MatchHolder<>()); |
| } |
| } |
| |
| /** |
| * Runs the supplied query against this CandidateMatcher's set of documents, storing any |
| * resulting match, and recording the query in the presearcher hits |
| * |
| * @param queryId the query id |
| * @param matchQuery the query to run |
| * @param metadata the query metadata |
| * @throws IOException on IO errors |
| */ |
| protected abstract void matchQuery(String queryId, Query matchQuery, Map<String, String> metadata) throws IOException; |
| |
| /** |
| * Record a match |
| * |
| * @param match a QueryMatch object |
| */ |
| protected final void addMatch(T match, int doc) { |
| MatchHolder<T> docMatches = matches.get(doc); |
| docMatches.matches.compute(match.getQueryId(), (key, oldValue) -> { |
| if (oldValue != null) { |
| return resolve(match, oldValue); |
| } |
| return match; |
| }); |
| } |
| |
| /** |
| * If two matches from the same query are found (for example, two branches of a disjunction), |
| * combine them. |
| * |
| * @param match1 the first match found |
| * @param match2 the second match found |
| * @return a Match object that combines the two |
| */ |
| public abstract T resolve(T match1, T match2); |
| |
| /** |
| * Called by the Monitor if running a query throws an Exception |
| */ |
| void reportError(String queryId, Exception e) { |
| this.errors.put(queryId, e); |
| } |
| |
| /** |
| * @return the matches from this matcher |
| */ |
| final MultiMatchingQueries<T> finish(long buildTime, int queryCount) { |
| doFinish(); |
| this.searchTime = TimeUnit.MILLISECONDS.convert(System.nanoTime() - searchTime, TimeUnit.NANOSECONDS); |
| List<Map<String, T>> results = new ArrayList<>(); |
| for (MatchHolder<T> matchHolder : matches) { |
| results.add(matchHolder.matches); |
| } |
| return new MultiMatchingQueries<>(results, errors, buildTime, searchTime, queryCount, matches.size()); |
| } |
| |
| /** |
| * Called when all monitoring of a batch of documents is complete |
| */ |
| protected void doFinish() { } |
| |
| /** |
| * Copy all matches from another CandidateMatcher |
| */ |
| protected void copyMatches(CandidateMatcher<T> other) { |
| this.matches.clear(); |
| this.matches.addAll(other.matches); |
| } |
| |
| } |