[13238] | 1 | /*
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[25854] | 2 | * GS2LuceneSearch.java
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| 3 | * Copyright (C) 2006 New Zealand Digital Library, http://www.nzdl.org
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| 4 | *
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| 5 | * This program is free software; you can redistribute it and/or modify
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| 6 | * the Free Software Foundation; either version 2 of the License, or
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| 7 | * (at your option) any later version.
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| 8 | *
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| 9 | * This program is distributed in the hope that it will be useful,
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| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | * GNU General Public License for more details.
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| 13 | *
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| 14 | * You should have received a copy of the GNU General Public License
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| 15 | * along with this program; if not, write to the Free Software
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| 16 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 17 | */
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[13238] | 18 |
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| 19 | package org.greenstone.gsdl3.service;
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| 20 |
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| 21 | // Greenstone classes
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[13576] | 22 | import java.io.File;
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[32619] | 23 | import java.io.IOException;
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[30049] | 24 | import java.io.Serializable;
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[25885] | 25 | import java.util.ArrayList;
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[25854] | 26 | import java.util.HashMap;
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[13576] | 27 | import java.util.Iterator;
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[30049] | 28 | import java.util.List;
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[25854] | 29 | import java.util.Map;
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[13576] | 30 | import java.util.Set;
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| 31 | import java.util.Vector;
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[13238] | 32 |
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[32619] | 33 | // For maintaining Lucene IndexReader objects at collection level
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| 34 | import org.apache.lucene.index.DirectoryReader;
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| 35 | import org.apache.lucene.index.IndexReader;
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| 36 | import org.apache.lucene.store.Directory;
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| 37 | import org.apache.lucene.store.FSDirectory;
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| 38 |
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[13270] | 39 | import org.apache.log4j.Logger;
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[29143] | 40 | import org.greenstone.LuceneWrapper4.GS2LuceneQuery;
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| 41 | import org.greenstone.LuceneWrapper4.LuceneQueryResult;
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[25885] | 42 | import org.greenstone.gsdl3.util.FacetWrapper;
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[25854] | 43 | import org.greenstone.gsdl3.util.GSFile;
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| 44 | import org.greenstone.gsdl3.util.GSXML;
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[28966] | 45 | import org.greenstone.gsdl3.util.XMLConverter;
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| 46 | import org.w3c.dom.Document;
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[25854] | 47 | import org.w3c.dom.Element;
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[13576] | 48 |
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[32619] | 49 |
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[24722] | 50 | public class GS2LuceneSearch extends SharedSoleneGS2FieldSearch
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[13238] | 51 | {
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[29558] | 52 |
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[29544] | 53 | protected static final String SORT_ORDER_PARAM = "reverseSort";
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| 54 | protected static final String SORT_ORDER_REVERSE = "1";
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| 55 | protected static final String SORT_ORDER_NORMAL = "0";
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| 56 |
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[32619] | 57 | // IndexReader objects are to be opened for each index level (e.g. one for didx, one for sidx) of a
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| 58 | // collection and will live for the duration of that collection, which is from collection activation
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| 59 | // until deactivation.
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| 60 | // So we want singletons of each index level's IndexReader, since IndexReaders are "multi-threaded
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| 61 | // re-entrant", so there's support for just one reader per index with concurrent access by multiple users'
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| 62 | // search queries.
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| 63 | // When a collection is deactivated, we need to close the reader objects to prevent handles to the
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| 64 | // index lingering and causing file locking issues on windows.
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| 65 | // Since GS2LuceneQuery now becomes a local member variable instantiated per query, we have to maintain
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| 66 | // IndexReader objects in GS2LuceneSearch instead, as GS2LuceneSearch is a collection's service, and
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| 67 | // therefore activated and deactivated along with the collection.
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| 68 | // The uniqueness of an IndexReader is indicated in the filepath to its index folder (collection path + sidx/didx).
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| 69 | // It doesn't have to be a static map of index_dir to IndexReader, and can be a member variable, since
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| 70 | // no other collection will refer to the same didx and sidx index folders: each collection has unique filepaths
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| 71 | // to its collection folder's index subdirs, not shared with other collections so the Readers don't have to be
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| 72 | // shared between collections either.
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| 73 |
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| 74 | // We now store IndexReaders in a map of singleton index_dir -> IndexReaders opened for this collection:
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| 75 | // one Reader singleton for each index_dir
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| 76 | private Map<String, IndexReader> index_to_reader_map = new HashMap<String, IndexReader>();
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| 77 |
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[25854] | 78 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.service.GS2LuceneSearch.class.getName());
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[13576] | 79 |
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[25854] | 80 | public GS2LuceneSearch()
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| 81 | {
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[29558] | 82 | does_paging = true;
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[29544] | 83 | paramDefaults.put(SORT_ORDER_PARAM, SORT_ORDER_NORMAL);
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[25854] | 84 | }
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[13238] | 85 |
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[25854] | 86 | public void cleanUp()
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| 87 | {
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| 88 | super.cleanUp();
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[32619] | 89 |
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| 90 | // Prevent file locking issues: close all IndexReader objects maintained for this collection
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| 91 | synchronized(index_to_reader_map) { // Regular Map implementations are not synchronized, so adding/removing requires synchronizing on the map object.
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| 92 | // see https://docs.oracle.com/javase/7/docs/api/java/util/HashMap.html
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| 93 | // And ConcurrentHashMap seems complicated, https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ConcurrentHashMap.html
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| 94 |
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| 95 | // Synchronizing *outside* the loop because cleanUp() clears the entire HashMap.
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| 96 | // Don't let any other threads access the map, hence synchronizing.
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| 97 | // Not sure if there may be other threads accessing the map when deactivating a collection which calls cleanUp().
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| 98 | // However, when multiple users' search queries lead to adding to the hashmap, definitely need to
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| 99 | // synchronize as there's a greater possibility of concurrent access then.
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| 100 |
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| 101 | Iterator<Map.Entry<String,IndexReader>> map_iterator = index_to_reader_map.entrySet().iterator();
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| 102 | // Can use the Map.Entry Set view iterator to remove (key, value) entry from underlying Map!
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| 103 | // See https://docs.oracle.com/javase/7/docs/api/java/util/HashMap.html#keySet()
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| 104 | // Same thread creates the iterator as synchronizes on the map, so we should be allowed to remove() from the map
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| 105 | // but only through iterator!
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| 106 | while(map_iterator.hasNext()) {
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| 107 | Map.Entry<String,IndexReader> entry = map_iterator.next();
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| 108 | //index_to_reader_map.remove(...); // concurrentmodexception! Only allowed to remove through iterator. Will remove recent object returned by next()
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| 109 | IndexReader reader = entry.getValue(); //keys are index dir paths, e.g. path to current collection's didx folder, values are IndexReader objects
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| 110 | map_iterator.remove(); // removes current key's (key,value) entry from underlying map! (Remember, we're iterating on the keyset)
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| 111 | // We're first removing the reader singleton from map because reader.close() will only close the reader
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| 112 | //if it's the final reference to it in case that has a bearing here
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| 113 |
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| 114 | if(reader != null) { // if there was a reader singleton instantiated for this index directory, e.g. coll-didx, close it
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| 115 | try {
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| 116 | // We're opening an IndexReader per indexdir once and closing it once: at start and end of collection.
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| 117 | // If Reader was a member var of GS2LuceneQuery and if multiple GS2LuceneQuery Objects were to call close() on the
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| 118 | // same reader object (on the singleton instance of reader for an index dir), so close is called multiple times,
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| 119 | // then would use incRef and decRef, see http://lucene.472066.n3.nabble.com/IndexReader-close-behavior-td2865515.html
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| 120 | // But then when concurrent queries are done, the final one would have closed the IndexReader and it would have to
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| 121 | // be reopened for the next query. We'd rather keep an opened IndexReader around until the collection's deactivated.
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| 122 | reader.close();
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| 123 | // Closes files associated with this index. Also saves any new deletions to disk.
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| 124 | // No other methods should be called after this has been called.
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| 125 | } catch (IOException exception) {
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| 126 | exception.printStackTrace();
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| 127 | }
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| 128 | }
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| 129 | } // end loop
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| 130 | } // end synchronising on index_to_reader_map
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| 131 |
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| 132 | // Now we've closed all the Readers maintained for this collection and cleared the map.
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[25854] | 133 | }
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[32619] | 134 |
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[32453] | 135 | public boolean configure(Element info, Element extra_info)
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| 136 | {
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| 137 | if (!super.configure(info, extra_info))
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| 138 | {
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| 139 | return false;
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| 140 | }
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| 141 | logger.info("Configuring GS2LuceneSearch...");
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| 142 |
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| 143 | // add our reverseSort param to be saved to the session
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| 144 | this.save_params.add(SORT_ORDER_PARAM);
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| 145 | return true;
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| 146 | }
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[29544] | 147 | /** add in the Lucene specific params to TextQuery */
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| 148 | protected void addCustomQueryParams(Element param_list, String lang)
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| 149 | {
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| 150 | super.addCustomQueryParams(param_list, lang);
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| 151 | /** Add in the reverse sort on/off param */
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| 152 | createParameter(SORT_ORDER_PARAM, param_list, lang);
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| 153 | }
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| 154 | /** add in Lucene specific params for AdvancedFieldQuery */
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| 155 | protected void addCustomQueryParamsAdvField(Element param_list, String lang)
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| 156 | {
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| 157 | super.addCustomQueryParamsAdvField(param_list, lang);
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| 158 | createParameter(SORT_ORDER_PARAM, param_list, lang);
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| 159 |
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| 160 | }
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| 161 | /** create a param and add to the list */
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| 162 | protected void createParameter(String name, Element param_list, String lang)
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| 163 | {
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| 164 | Document doc = param_list.getOwnerDocument();
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| 165 | Element param = null;
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| 166 | String param_default = paramDefaults.get(name);
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| 167 | if (name.equals(SORT_ORDER_PARAM)) {
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| 168 | String[] vals = { SORT_ORDER_REVERSE, SORT_ORDER_NORMAL };
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| 169 | String[] vals_texts = { getTextString("param." + SORT_ORDER_PARAM + "." + SORT_ORDER_REVERSE, lang), getTextString("param." + SORT_ORDER_PARAM + "." + SORT_ORDER_NORMAL, lang) };
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| 170 |
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| 171 | param = GSXML.createParameterDescription(doc, SORT_ORDER_PARAM, getTextString("param." + SORT_ORDER_PARAM, lang), GSXML.PARAM_TYPE_ENUM_SINGLE, param_default, vals, vals_texts);
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| 172 | }
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| 173 |
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| 174 | if (param != null)
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| 175 | {
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| 176 | param_list.appendChild(param);
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| 177 | }
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| 178 | else
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| 179 | {
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| 180 | super.createParameter(name, param_list, lang);
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| 181 | }
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| 182 |
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| 183 | }
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[29558] | 184 |
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[25854] | 185 | /** methods to handle actually doing the query */
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| 186 |
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| 187 | /** do any initialisation of the query object */
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[32619] | 188 | protected Object setUpQueryer(HashMap params)
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[25854] | 189 | {
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[32619] | 190 | // local Query object
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| 191 | GS2LuceneQuery lucene_src = new GS2LuceneQuery();
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| 192 |
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[25854] | 193 | String indexdir = GSFile.collectionBaseDir(this.site_home, this.cluster_name) + File.separatorChar + "index" + File.separatorChar;
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| 194 |
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| 195 | String index = "didx";
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[30145] | 196 | if (this.default_level.toUpperCase().equals("SEC")) {
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| 197 | index = "sidx";
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| 198 | }
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[25854] | 199 | String physical_index_language_name = null;
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| 200 | String physical_sub_index_name = null;
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[29428] | 201 | int hits_per_page = Integer.parseInt(paramDefaults.get(HITS_PER_PAGE_PARAM));
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| 202 | int start_page = Integer.parseInt(paramDefaults.get(START_PAGE_PARAM));
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| 203 | String sort_field = getLuceneSort(default_sort);
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| 204 | String sort_order = paramDefaults.get(SORT_ORDER_PARAM);
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[29558] | 205 |
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[25854] | 206 | // set up the query params
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| 207 | Set entries = params.entrySet();
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| 208 | Iterator i = entries.iterator();
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| 209 | while (i.hasNext())
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| 210 | {
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| 211 | Map.Entry m = (Map.Entry) i.next();
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| 212 | String name = (String) m.getKey();
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| 213 | String value = (String) m.getValue();
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| 214 |
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[29558] | 215 | if (name.equals(HITS_PER_PAGE_PARAM))
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[25854] | 216 | {
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[29558] | 217 | if (value.equals("all")) {
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| 218 | hits_per_page = -1;
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| 219 | } else {
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| 220 | hits_per_page = Integer.parseInt(value);
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| 221 | }
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[25854] | 222 | }
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| 223 | else if (name.equals(START_PAGE_PARAM))
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| 224 | {
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| 225 | start_page = Integer.parseInt(value);
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| 226 |
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| 227 | }
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| 228 | else if (name.equals(MATCH_PARAM))
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| 229 | {
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| 230 | if (value.equals(MATCH_PARAM_ALL))
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| 231 | {
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[32619] | 232 | lucene_src.setDefaultConjunctionOperator("AND");
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[25854] | 233 | }
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| 234 | else
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| 235 | {
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[32619] | 236 | lucene_src.setDefaultConjunctionOperator("OR");
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[25854] | 237 | }
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| 238 | }
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| 239 | else if (name.equals(RANK_PARAM))
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| 240 | {
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[29428] | 241 | sort_field = getLuceneSort(value);
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[32619] | 242 | lucene_src.setSortField(sort_field);
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[29428] | 243 |
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[25854] | 244 | }
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[27085] | 245 | else if (name.equals(SORT_ORDER_PARAM)) {
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[28029] | 246 | sort_order = value;
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| 247 | }
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[25854] | 248 | else if (name.equals(LEVEL_PARAM))
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| 249 | {
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| 250 | if (value.toUpperCase().equals("SEC"))
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| 251 | {
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| 252 | index = "sidx";
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| 253 | }
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| 254 | else
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| 255 | {
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| 256 | index = "didx";
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| 257 | }
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| 258 | }
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| 259 | else if (name.equals(INDEX_SUBCOLLECTION_PARAM))
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| 260 | {
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| 261 | physical_sub_index_name = value;
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| 262 | }
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| 263 | else if (name.equals(INDEX_LANGUAGE_PARAM))
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| 264 | {
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| 265 | physical_index_language_name = value;
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| 266 | } // ignore any others
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[13576] | 267 | }
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[25854] | 268 | // set up start and end results if necessary
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[30147] | 269 | // start results always start at 0
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| 270 | int start_results = 0;
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[29558] | 271 | if (start_page > 1 && hits_per_page > 0)
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[25854] | 272 | {
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[30147] | 273 | start_results = ((start_page - 1) * hits_per_page) ;
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[13576] | 274 | }
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[29558] | 275 | int end_results = Integer.MAX_VALUE;
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| 276 | if (hits_per_page > 0) {
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| 277 | end_results = hits_per_page * start_page;
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| 278 | }
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[32619] | 279 | lucene_src.setStartResults(start_results);
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| 280 | lucene_src.setEndResults(end_results);
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[25854] | 281 |
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| 282 | if (index.equals("sidx") || index.equals("didx"))
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| 283 | {
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| 284 | if (physical_sub_index_name != null)
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| 285 | {
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| 286 | index += physical_sub_index_name;
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| 287 | }
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| 288 | if (physical_index_language_name != null)
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| 289 | {
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| 290 | index += physical_index_language_name;
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| 291 | }
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[13576] | 292 | }
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[25854] | 293 |
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[29544] | 294 | if (sort_order.equals(SORT_ORDER_REVERSE)) {
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[32619] | 295 | lucene_src.setReverseSort(true);
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[28029] | 296 | } else {
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[32619] | 297 | lucene_src.setReverseSort(false);
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[28029] | 298 | }
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[32619] | 299 |
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| 300 | String full_index_dir_str = indexdir + index;
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| 301 | lucene_src.setIndexDir(full_index_dir_str);
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| 302 |
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| 303 | // Ensure we have an IndexReader for this full_index_dir_str:
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| 304 | // check the hashmap first, in case we already opened a reader and searcher for this index dir, e.g. didx
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| 305 | // if there was a reader singleton instantiated for this index directory, e.g. <coll>didx, use that.
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| 306 | // Else open a new reader for this index_dir and store it in the map.
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| 307 | IndexReader reader = index_to_reader_map.get(full_index_dir_str);
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| 308 | if(reader == null) {
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| 309 | try {
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| 310 | Directory full_indexdir_dir = FSDirectory.open(new File(full_index_dir_str));
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| 311 | reader = DirectoryReader.open(full_indexdir_dir); // Returns an IndexReader reading the index in the given Directory. now readOnly=true by default, and therefore also for searcher
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| 312 | synchronized(index_to_reader_map) {
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| 313 | // If storing searcher along with reader, mimic Pairs with: https://stackoverflow.com/questions/2670982/using-pairs-or-2-tuples-in-java
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| 314 | index_to_reader_map.put(full_index_dir_str, reader);
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| 315 | }
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| 316 | }
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| 317 | catch (IOException exception) {
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| 318 | exception.printStackTrace();
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| 319 | }
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| 320 | }
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| 321 |
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| 322 | lucene_src.initialise(reader); // sets IndexReader and IndexSearcher
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| 323 |
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| 324 | return lucene_src; // return the queryobject
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[25854] | 325 | }
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| 326 |
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| 327 | /** do the query */
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[32619] | 328 | protected Object runQuery(Object queryObject, String query)
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[25854] | 329 | {
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[32619] | 330 | GS2LuceneQuery lucene_src = (GS2LuceneQuery) queryObject;
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[25854] | 331 | try
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| 332 | {
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[32619] | 333 | LuceneQueryResult lqr = lucene_src.runQuery(query);
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[25854] | 334 | return lqr;
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[24024] | 335 | }
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[25854] | 336 | catch (Exception e)
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| 337 | {
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| 338 | logger.error("Exception happened in runQuery(): ", e);
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| 339 | }
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| 340 |
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| 341 | return null;
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[13576] | 342 | }
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[25854] | 343 |
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| 344 | /** get the total number of docs that match */
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| 345 | protected long numDocsMatched(Object query_result)
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| 346 | {
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| 347 | return ((LuceneQueryResult) query_result).getTotalDocs();
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[24024] | 348 | }
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[25854] | 349 |
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| 350 | /** get the list of doc ids */
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| 351 | protected String[] getDocIDs(Object query_result)
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| 352 | {
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| 353 | Vector docs = ((LuceneQueryResult) query_result).getDocs();
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| 354 | String[] doc_nums = new String[docs.size()];
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| 355 | for (int d = 0; d < docs.size(); d++)
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| 356 | {
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| 357 | String doc_num = ((LuceneQueryResult.DocInfo) docs.elementAt(d)).id_;
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| 358 | doc_nums[d] = doc_num;
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| 359 | }
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| 360 | return doc_nums;
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[24024] | 361 | }
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[24722] | 362 |
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[25854] | 363 | /** get the list of doc ranks */
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| 364 | protected String[] getDocRanks(Object query_result)
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| 365 | {
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| 366 | Vector docs = ((LuceneQueryResult) query_result).getDocs();
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| 367 | String[] doc_ranks = new String[docs.size()];
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| 368 | for (int d = 0; d < docs.size(); d++)
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| 369 | {
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| 370 | doc_ranks[d] = Float.toString(((LuceneQueryResult.DocInfo) docs.elementAt(d)).rank_);
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| 371 | }
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| 372 | return doc_ranks;
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[13238] | 373 | }
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[24722] | 374 |
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[25854] | 375 | /** add in term info if available */
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[25855] | 376 | protected boolean addTermInfo(Element term_list, HashMap params, Object query_result)
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[25854] | 377 | {
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[28966] | 378 | Document doc = term_list.getOwnerDocument();
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[25854] | 379 | String query_level = (String) params.get(LEVEL_PARAM); // the current query level
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[24722] | 380 |
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[25854] | 381 | Vector terms = ((LuceneQueryResult) query_result).getTerms();
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| 382 | for (int t = 0; t < terms.size(); t++)
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| 383 | {
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| 384 | LuceneQueryResult.TermInfo term_info = (LuceneQueryResult.TermInfo) terms.get(t);
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[18422] | 385 |
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[28966] | 386 | Element term_elem = doc.createElement(GSXML.TERM_ELEM);
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[25854] | 387 | term_elem.setAttribute(GSXML.NAME_ATT, term_info.term_);
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| 388 | term_elem.setAttribute(FREQ_ATT, "" + term_info.term_freq_);
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| 389 | term_elem.setAttribute(NUM_DOCS_MATCH_ATT, "" + term_info.match_docs_);
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| 390 | term_elem.setAttribute(FIELD_ATT, term_info.field_);
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| 391 | term_list.appendChild(term_elem);
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| 392 | }
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[24722] | 393 |
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[25854] | 394 | Vector stopwords = ((LuceneQueryResult) query_result).getStopWords();
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| 395 | for (int t = 0; t < stopwords.size(); t++)
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| 396 | {
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| 397 | String stopword = (String) stopwords.get(t);
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| 398 |
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[28966] | 399 | Element stopword_elem = doc.createElement(GSXML.STOPWORD_ELEM);
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[25854] | 400 | stopword_elem.setAttribute(GSXML.NAME_ATT, stopword);
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| 401 | term_list.appendChild(stopword_elem);
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| 402 | }
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| 403 |
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| 404 | return true;
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[24024] | 405 | }
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[25885] | 406 |
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[32084] | 407 | protected ArrayList<FacetWrapper> getFacets(Object query_result, String lang)
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[25885] | 408 | {
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| 409 | return null;
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| 410 | }
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[29428] | 411 |
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| 412 | protected String getLuceneSort(String gs3_sort) {
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| 413 |
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| 414 | if (gs3_sort.equals(RANK_PARAM_RANK)) {
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| 415 | return GS2LuceneQuery.SORT_RANK;
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| 416 | }
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| 417 | if (gs3_sort.equals(RANK_PARAM_NONE)) {
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| 418 | return GS2LuceneQuery.SORT_NATURAL;
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| 419 | }
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| 420 | return gs3_sort;
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| 421 | }
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[30049] | 422 |
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| 423 | @Override
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| 424 | protected Map<String, Map<String, List<String>>> getHighlightSnippets(
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| 425 | Object query_result) {
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| 426 | // TODO Auto-generated method stub
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| 427 | return null;
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[13238] | 428 | }
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[30049] | 429 |
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| 430 | }
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