bundles/org.simantics.db.indexing/src/org/simantics/db/indexing/IndexedRelationsSearcher.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.db.indexing;
  13
  14 import java.io.IOException;
  15 import java.util.ArrayList;
  16 import java.util.Collection;
  17 import java.util.HashMap;
  18 import java.util.List;
  19 import java.util.Map;
  20
  21 import org.apache.lucene.index.CorruptIndexException;
  22 import org.apache.lucene.queryparser.classic.ParseException;
  23 import org.eclipse.core.runtime.IProgressMonitor;
  24 import org.simantics.db.RequestProcessor;
  25 import org.simantics.db.Resource;
  26 import org.simantics.db.Session;
  27 import org.simantics.db.exception.DatabaseException;
  28 import org.simantics.db.layer0.adapter.GenericRelation;
  29 import org.simantics.utils.datastructures.Pair;
  30 import org.slf4j.Logger;
  31 import org.slf4j.LoggerFactory;
  32
  33 /**
  34  * @author Tuukka Lehtonen
  35  * @author Antti Villberg
  36  */
  37 public class IndexedRelationsSearcher extends IndexedRelationsSearcherBase {
  38
  39     private static final Logger LOGGER = LoggerFactory.getLogger(IndexedRelationsSearcher.class);
  40
  41     IndexedRelationsMemorySearcher cache;
  42
  43     IndexedRelationsSearcher(RequestProcessor session, Resource relation, Resource input, GenericRelation r) throws DatabaseException {
  44         super(session, relation, input);
  45         this.cache = new IndexedRelationsMemorySearcher(session, this, relation, input, r);
  46     }
  47
  48     @Override
  49     String getDescriptor() {
  50         return "DISK: ";
  51     }
  52
  53     @Override
  54     public void setProblem(Throwable t) {
  55         super.setProblem(t);
  56         cache.setProblem(t);
  57     }
  58
  59     @Override
  60     boolean startAccess(IProgressMonitor monitor, Session session, boolean forWriting) {
  61         boolean success = super.startAccess(monitor, session, false);
  62         if(!success) return false;
  63         success = cache.startAccess(monitor, session, forWriting);
  64         if(!success) {
  65                 setProblem(cache.getException());
  66                 return false;
  67         } else return true;
  68     }
  69
  70     @Override
  71     void insertIndex(IProgressMonitor monitor, GenericRelation r, int boundLength, Collection<Object[]> documentsData)
  72             throws CorruptIndexException, IOException, DatabaseException {
  73
  74         Collection<Object> keyValues = new ArrayList<Object>();
  75         for(Object[] data : documentsData) {
  76             keyValues.add(data[1]);
  77         }
  78
  79         cache.replaceIndex(monitor, "Resource", keyValues, r, boundLength, documentsData);
  80         //cache.commit();
  81
  82     }
  83
  84     @Override
  85     void removeIndex(IProgressMonitor monitor, GenericRelation r, RequestProcessor processor, String key, Collection<Object> keyValues) throws DatabaseException,CorruptIndexException, IOException {
  86
  87         Collection<Object[]> documentsData = new ArrayList<Object[]>();
  88
  89         Pair<String,String>[] fields = r.getFields();
  90
  91         for(Object keyValue : keyValues) {
  92             Object[] data = new Object[fields.length-1];
  93             int index = 0;
  94             for(int i=1;i<fields.length;i++) {
  95                 String fieldName = fields[i].first;
  96                 if(key.equals(fieldName)) {
  97                     data[index++] = keyValue;
  98                 } else {
  99                     String fieldClass = fields[i].second;
 100                     if ("Long".equals(fieldClass)) {
 101                         data[index++] = 0L;
 102                     } else if ("String".equals(fieldClass) || "Text".equals(fieldClass)) {
 103                         data[index++] = "";
 104                     } else {
 105                         throw new DatabaseException("Can only index Long and String fields, encountered class " + fieldClass);
 106                     }
 107                 }
 108             }
 109             documentsData.add(data);
 110         }
 111
 112         cache.replaceIndex(monitor, key, keyValues, r, 1, documentsData);
 113 //        cache.commit();
 114
 115     }
 116
 117     @Override
 118     boolean replaceIndex(IProgressMonitor monitor, String key, Collection<Object> keyValues, GenericRelation r,
 119             int boundLength, Collection<Object[]> documentsData) throws CorruptIndexException, IOException,
 120             DatabaseException {
 121
 122         boolean result = cache.replaceIndex(monitor, key, keyValues, r, boundLength, documentsData);
 123 //        cache.commit();
 124         return result;
 125
 126     }
 127
 128     List<Map<String, Object>> persistentCachedSearch(IProgressMonitor monitor, RequestProcessor processor, String search,
 129             int maxResultCount) throws ParseException, IOException, DatabaseException {
 130
 131         MemoryIndexing mem = MemoryIndexing.getInstance(session.getSession());
 132
 133         String key = indexPath.toAbsolutePath().toString();
 134
 135         Map<String,List<Map<String, Object>>> cache = mem.persistentCache.get(key);
 136         if(cache != null) {
 137             List<Map<String,Object>> result = cache.get(search);
 138             if(result != null) return result;
 139         }
 140
 141         startAccess(monitor, processor.getSession(), false);
 142
 143         List<Map<String, Object>> results = super.doSearch(monitor, processor, search, maxResultCount);
 144         if(cache == null) {
 145             cache = new HashMap<String,List<Map<String,Object>>>();
 146             mem.persistentCache.put(key, cache);
 147         }
 148
 149         if(results.size() < 500)
 150             cache.put(search, results);
 151
 152         return results;
 153
 154     }
 155
 156     List<Resource> persistentCachedSearchResources(IProgressMonitor monitor, RequestProcessor processor, String search,
 157             int maxResultCount) throws ParseException, IOException, DatabaseException {
 158
 159         MemoryIndexing mem = MemoryIndexing.getInstance(session.getSession());
 160
 161         String key = indexPath.toAbsolutePath().toString();
 162
 163         Map<String,List<Resource>> cache = mem.persistentCacheResources.get(key);
 164         if(cache != null) {
 165             List<Resource> result = cache.get(search);
 166             if(result != null) return result;
 167         }
 168
 169         startAccess(monitor, processor.getSession(), false);
 170
 171         List<Resource> results = super.doSearchResources(monitor, processor, search, maxResultCount);
 172         if(cache == null) {
 173             cache = new HashMap<String,List<Resource>>();
 174             mem.persistentCacheResources.put(key, cache);
 175         }
 176
 177         if(results.size() < 500)
 178             cache.put(search, results);
 179
 180         return results;
 181
 182     }
 183
 184     List<Object> persistentCachedList(IProgressMonitor monitor, RequestProcessor processor) throws ParseException, IOException, DatabaseException {
 185
 186         startAccess(monitor, processor.getSession(), false);
 187
 188         List<Object> results = super.doList(monitor, processor);
 189
 190         return results;
 191
 192     }
 193
 194     @Override
 195     List<Map<String, Object>> doSearch(IProgressMonitor monitor, RequestProcessor processor, String search,
 196             int maxResultCount) throws ParseException, IOException, DatabaseException {
 197
 198         List<Map<String,Object>> persistent = persistentCachedSearch(monitor, processor, search, maxResultCount);
 199         List<Map<String,Object>> cached = cache.doSearch(monitor, processor, search, maxResultCount);
 200
 201         ArrayList<Map<String,Object>> result = new ArrayList<Map<String,Object>>();
 202
 203         for(Map<String,Object> m : persistent) {
 204             Resource r = (Resource)m.get("Resource");
 205             if(!cache.changed.contains(r.getResourceId())) {
 206                 result.add(m);
 207             }
 208         }
 209         result.addAll(cached);
 210         return result;
 211
 212     }
 213
 214     @Override
 215     List<Resource> doSearchResources(IProgressMonitor monitor, RequestProcessor processor, String search,
 216                 int maxResultCount) throws ParseException, IOException, DatabaseException {
 217
 218         List<Resource> persistent = persistentCachedSearchResources(monitor, processor, search, maxResultCount);
 219         List<Resource> cached = cache.doSearchResources(monitor, processor, search, maxResultCount);
 220
 221         ArrayList<Resource> result = new ArrayList<Resource>();
 222         for(Resource r : persistent) {
 223             if(!cache.changed.contains(r.getResourceId())) {
 224                 result.add(r);
 225             }
 226         }
 227         result.addAll(cached);
 228         return result;
 229
 230     }
 231
 232     List<Object> doList(IProgressMonitor monitor, RequestProcessor processor) throws ParseException, IOException, DatabaseException {
 233
 234         List<Object> persistent = persistentCachedList(monitor, processor);
 235
 236         // TODO: check that caches have been properly flushed
 237         //List<Object> cached = cache.doList(monitor, processor);
 238         //if(!cached.isEmpty()) throw new DatabaseException("doList does not support caching");
 239
 240         return persistent;
 241
 242     }
 243
 244     void applyChanges(IProgressMonitor monitor, Session session, GenericRelation r, Collection<Object[]> os) throws Exception {
 245
 246         if(!os.isEmpty()) {
 247
 248                 ArrayList<Object> replaceKeys = new ArrayList<Object>();
 249                 ArrayList<Object[]> replaceValues = new ArrayList<Object[]>();
 250                 ArrayList<Object> removeKeys = new ArrayList<Object>();
 251                 for(Object[] o : os) {
 252                     Long parent = (Long)o[0];
 253                     Long key = (Long)o[1];
 254                     if(parent != 0) {
 255                         replaceKeys.add(key);
 256                         replaceValues.add(o);
 257                     } else {
 258                         removeKeys.add(key);
 259                     }
 260                 }
 261
 262                 changeState(monitor, session, State.READY);
 263
 264                 super.startAccess(null, session, true);
 265
 266                 super.replaceIndex(null, "Resource", replaceKeys, r, 1, replaceValues);
 267                 super.removeIndex(null, r, null, "Resource", removeKeys);
 268
 269         }
 270
 271         changeState(monitor, session, State.READY);
 272
 273     }
 274
 275     @Override
 276     Throwable bestEffortClear(IProgressMonitor monitor, Session session) {
 277
 278         // Free the index
 279         changeState(monitor, session, State.NONE);
 280
 281         Throwable t = clearDirectory(monitor, session);
 282         if(t != null) return t;
 283
 284         t = cache.bestEffortClear(monitor, session);
 285         if(t != null) return t;
 286
 287         String key = indexPath.toAbsolutePath().toString();
 288         MemoryIndexing mem = MemoryIndexing.getInstance(session);
 289         mem.persistentCache.remove(key);
 290         mem.persistentCacheResources.remove(key);
 291
 292         return null;
 293
 294     }
 295
 296     @Override
 297     protected Logger getLogger() {
 298         return LOGGER;
 299     }
 300
 301 }