bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/genericrelation/DependenciesRelation.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.layer0.genericrelation;
  13
  14 import java.util.ArrayList;
  15 import java.util.Arrays;
  16 import java.util.Collection;
  17 import java.util.Collections;
  18 import java.util.HashSet;
  19 import java.util.List;
  20 import java.util.Map;
  21 import java.util.UUID;
  22
  23 import org.simantics.databoard.Bindings;
  24 import org.simantics.databoard.util.ObjectUtils;
  25 import org.simantics.datatypes.literal.GUID;
  26 import org.simantics.db.ChangeSet;
  27 import org.simantics.db.ChangeSet.StatementChange;
  28 import org.simantics.db.MetadataI;
  29 import org.simantics.db.ReadGraph;
  30 import org.simantics.db.RequestProcessor;
  31 import org.simantics.db.Resource;
  32 import org.simantics.db.Session;
  33 import org.simantics.db.Statement;
  34 import org.simantics.db.WriteGraph;
  35 import org.simantics.db.common.Indexing;
  36 import org.simantics.db.common.changeset.GenericChangeListener;
  37 import org.simantics.db.common.request.IndexRoot;
  38 import org.simantics.db.common.request.ReadRequest;
  39 import org.simantics.db.common.request.SuperTypeString;
  40 import org.simantics.db.common.request.TypeString;
  41 import org.simantics.db.common.request.UnaryRead;
  42 import org.simantics.db.common.utils.NameUtils;
  43 import org.simantics.db.event.ChangeListener;
  44 import org.simantics.db.exception.DatabaseException;
  45 import org.simantics.db.exception.NoSingleResultException;
  46 import org.simantics.db.layer0.adapter.GenericRelation;
  47 import org.simantics.db.layer0.adapter.GenericRelationIndex;
  48 import org.simantics.db.layer0.genericrelation.DependencyChanges.Change;
  49 import org.simantics.db.layer0.genericrelation.DependencyChanges.ComponentAddition;
  50 import org.simantics.db.layer0.genericrelation.DependencyChanges.ComponentModification;
  51 import org.simantics.db.layer0.genericrelation.DependencyChanges.ComponentRemoval;
  52 import org.simantics.db.layer0.genericrelation.DependencyChanges.LinkChange;
  53 import org.simantics.db.procedure.SyncContextMultiProcedure;
  54 import org.simantics.db.procedure.SyncContextProcedure;
  55 import org.simantics.db.service.CollectionSupport;
  56 import org.simantics.db.service.DirectQuerySupport;
  57 import org.simantics.db.service.GraphChangeListenerSupport;
  58 import org.simantics.db.service.ManagementSupport;
  59 import org.simantics.db.service.SerialisationSupport;
  60 import org.simantics.layer0.Layer0;
  61 import org.simantics.operation.Layer0X;
  62 import org.simantics.utils.datastructures.Pair;
  63 import org.simantics.utils.logging.TimeLogger;
  64 import org.slf4j.LoggerFactory;
  65
  66 public class DependenciesRelation extends UnsupportedRelation implements GenericRelationIndex {
  67
  68     private static final org.slf4j.Logger LOGGER = LoggerFactory.getLogger(DependenciesRelation.class);
  69         private static final boolean DEBUG = false;
  70         static final boolean DEBUG_LISTENERS = false;
  71         private static final boolean PROFILE = false;
  72
  73         @SuppressWarnings("unchecked")
  74         private final static Pair<String, String>[] fields = new Pair[] {
  75                 Pair.make(Dependencies.FIELD_MODEL, "Long"),
  76                 Pair.make(Dependencies.FIELD_PARENT, "Long"),
  77                 Pair.make(Dependencies.FIELD_RESOURCE, "Long"),
  78                 Pair.make(Dependencies.FIELD_NAME, "String"),
  79                 Pair.make(Dependencies.FIELD_TYPES, "Text"),
  80                 Pair.make(Dependencies.FIELD_GUID, "Text")
  81         };
  82
  83         final Resource resource;
  84
  85         public DependenciesRelation(ReadGraph graph, Resource resource) {
  86                 this.resource = resource;
  87                 synchronized(this) {
  88                         Session session = graph.getSession();
  89                         DependenciesListenerStore store = session.peekService(DependenciesListenerStore.class);
  90                         if(store == null) session.registerService(DependenciesListenerStore.class, new DependenciesListenerStore());
  91                 }
  92         }
  93
  94         class Process {
  95
  96                 final ArrayList<Entry> result = new ArrayList<Entry>();
  97                 final SyncContextMultiProcedure<Resource, Resource> structure;
  98                 final SyncContextProcedure<Entry, String> names;
  99                 final SyncContextProcedure<Entry, Resource> type;
 100
 101                 Process(ReadGraph graph, final Resource resource) throws DatabaseException {
 102
 103                         final Layer0 L0 = Layer0.getInstance(graph);
 104                         final DirectQuerySupport dqs = graph.getService(DirectQuerySupport.class);
 105                         final CollectionSupport cs = graph.getService(CollectionSupport.class);
 106
 107                         names = dqs.compilePossibleRelatedValue(graph, L0.HasName, new SyncContextProcedure<Entry, String>() {
 108
 109                                 @Override
 110                                 public void execute(ReadGraph graph, Entry entry, String name) {
 111                                         entry.name = name;
 112                                 }
 113
 114                                 @Override
 115                                 public void exception(ReadGraph graph, Throwable throwable) {
 116                                         LOGGER.error("Could not compile possible related value for resource {}", resource, throwable);
 117                                 }
 118
 119                         });
 120
 121                         type = new SyncContextProcedure<Entry, Resource>() {
 122
 123                                 @Override
 124                                 public void execute(ReadGraph graph, Entry entry, Resource type) {
 125                                         entry.principalType = type;
 126                                 }
 127
 128                                 @Override
 129                                 public void exception(ReadGraph graph, Throwable throwable) {
 130                                         LOGGER.error("Could not find type for resource {}", resource, throwable);
 131                                 }
 132
 133                         };
 134
 135                         structure = dqs.compileForEachObject(graph, L0.ConsistsOf, new SyncContextMultiProcedure<Resource, Resource>() {
 136
 137                                 @Override
 138                                 public void execute(ReadGraph graph, Resource parent, Resource child) {
 139                                         // WORKAROUND: don't browse virtual child resources
 140                                         if(!child.isPersistent()) return;
 141                                         Entry entry = new Entry(parent, child, "", "", "");
 142                                         result.add(entry);
 143                                         dqs.forEachObjectCompiled(graph, child, child, structure);
 144                                         dqs.forPossibleRelatedValueCompiled(graph, child, entry, names);
 145                                         dqs.forPossibleDirectType(graph, child, entry, type);
 146                                 }
 147
 148                                 @Override
 149                                 public void finished(ReadGraph graph, Resource parent) {
 150                                 }
 151
 152                                 @Override
 153                                 public void exception(ReadGraph graph, Throwable throwable) {
 154                                     if (throwable instanceof NoSingleResultException) {
 155                                         // Ignore
 156                                         if (LOGGER.isDebugEnabled())
 157                                             LOGGER.debug("Could not compile for resource {}", resource, throwable);
 158                                     } else {
 159                                         LOGGER.error("Could not compile for resource {}", resource, throwable);
 160                                     }
 161                                 }
 162
 163                         });
 164
 165                         graph.syncRequest(new ReadRequest() {
 166
 167                                 @Override
 168                                 public void run(ReadGraph graph) throws DatabaseException {
 169                                         dqs.forEachObjectCompiled(graph, resource, resource, structure);
 170                                 }
 171
 172                         });
 173
 174             Map<Resource, String> typeStrings = cs.createMap(String.class);
 175                         for(Entry e : result) {
 176                                 if(e.principalType != null) {
 177                                     String typeString = typeStrings.get(e.principalType);
 178                                     if(typeString == null) {
 179                                         typeString = graph.syncRequest(new SuperTypeString(e.principalType));
 180                                         if (typeString.isEmpty()) {
 181                                             LOGGER.error("No name for type", new DatabaseException("No name for type " + NameUtils.getURIOrSafeNameInternal(graph, e.resource) + " (" + e.resource + ")"));
 182                                         }
 183                                         typeStrings.put(e.principalType, typeString);
 184                                     }
 185                                     e.types = typeString;
 186                                 } else {
 187                                     e.types = graph.syncRequest(new TypeString(L0, graph.getTypes(e.resource)));
 188                                 }
 189                                 GUID id = graph.getPossibleRelatedValue(e.resource, L0.identifier, GUID.BINDING);
 190                                 if(id != null)
 191                                         e.id = id.indexString();
 192                                 else
 193                                         e.id = "";
 194                         }
 195
 196                         //SessionGarbageCollection.gc(null, graph.getSession(), false, null);
 197
 198                 }
 199
 200         }
 201
 202         public ArrayList<Entry> find(ReadGraph graph, final Resource model) throws DatabaseException {
 203                 return new Process(graph, model).result;
 204         }
 205
 206         @Override
 207         public GenericRelation select(String bindingPattern, Object[] constants) {
 208                 checkSelectionArguments(bindingPattern, constants, new String[] { Dependencies.getBindingPattern() });
 209                 final long subjectId = (Long)constants[0];
 210                 return new UnsupportedRelation() {
 211
 212                         @Override
 213                         public boolean isRealizable() {
 214                                 return true;
 215                         }
 216
 217                         @Override
 218                         final public List<Object[]> realize(ReadGraph graph) throws DatabaseException {
 219
 220                                 long time = System.nanoTime();
 221
 222                 SerialisationSupport ss = graph.getService(SerialisationSupport.class);
 223
 224                                 Resource subject = ss.getResource(subjectId);
 225
 226                                 Collection<Entry> entries = find(graph, subject);
 227
 228                                 long time2 = System.nanoTime();
 229
 230                                 if (PROFILE)
 231                                         LOGGER.info("Found " + entries.size() + " dependencies in " + 1e-6 * (time2 - time) + "ms for " + graph.getPossibleURI(subject) + ".");
 232
 233                                 ArrayList<Object[]> result = new ArrayList<Object[]>();
 234                                 for (Entry entry : entries) {
 235                                         if(entry.name == null) continue;
 236                                         result.add(new Object[] { ss.getRandomAccessId(entry.parent), ss.getRandomAccessId(entry.resource), entry.name, entry.types, entry.id });
 237                                 }
 238                                 return result;
 239
 240                         }
 241
 242                 };
 243         }
 244
 245         @Override
 246         public Pair<String, String>[] getFields() {
 247                 return fields;
 248         }
 249
 250         @Override
 251         public List<Map<String, Object>> query(RequestProcessor session, String search, String bindingPattern, Object[] constants, int maxResultCount) {
 252                 if(!Dependencies.getBindingPattern().equals(bindingPattern)) throw new IllegalArgumentException("DependenciesRelation supports indexing only with 'bfffff'");
 253                 IndexedRelations indexer = session.getService(IndexedRelations.class);
 254                 return indexer.query(null, search, session, resource, (Resource)constants[0], maxResultCount);
 255         }
 256
 257         @Override
 258         public List<Resource> queryResources(RequestProcessor session, String search, String bindingPattern, Object[] constants, int maxResultCount) {
 259                 if(!Dependencies.getBindingPattern().equals(bindingPattern)) throw new IllegalArgumentException("DependenciesRelation supports indexing only with 'bfffff'");
 260                 IndexedRelations indexer = session.getService(IndexedRelations.class);
 261                 return indexer.queryResources(null, search, session, resource, (Resource)constants[0], maxResultCount);
 262         }
 263
 264         @Override
 265         public List<Map<String, Object>> list(RequestProcessor session, String bindingPattern, Object[] constants, int maxResultCount) {
 266                 if(!Dependencies.getBindingPattern().equals(bindingPattern)) throw new IllegalArgumentException("DependenciesRelation supports indexing only with 'bfffff'");
 267                 IndexedRelations indexer = session.getService(IndexedRelations.class);
 268                 return indexer.query(null, null, session, resource, (Resource)constants[0], maxResultCount);
 269         }
 270
 271         public static class DependencyChangesRequest extends UnaryRead<ChangeSet, DependencyChanges> {
 272
 273                 @SuppressWarnings("unused")
 274                 final private static boolean LOG = false;
 275
 276                 public DependencyChangesRequest(ChangeSet parameter) {
 277                         super(parameter);
 278                 }
 279
 280                 @Override
 281                 public DependencyChanges perform(ReadGraph graph) throws DatabaseException {
 282
 283                         DependencyChangesWriter w = new DependencyChangesWriter(graph);
 284                         Layer0 l0 = w.l0;
 285                         Resource changeInformation = graph.getPossibleResource("http://www.simantics.org/Modeling-1.2/changeInformation/Inverse");
 286
 287                         for (Resource value : parameter.changedValues()) {
 288                                 if(!value.isPersistent()) continue;
 289                                 Statement modifiedComponent = graph.getPossibleStatement(value, l0.PropertyOf);
 290                                 if (modifiedComponent == null
 291                                                 || modifiedComponent.getPredicate().equals(changeInformation))
 292                                         continue;
 293                                 if (DEBUG) {
 294                                     LOGGER.info("+comp modi " + NameUtils.getSafeName(graph, modifiedComponent.getObject(), true));
 295                                     LOGGER.info("    +value " + NameUtils.getSafeName(graph, value, true));
 296                                 }
 297                                 w.addComponentModification(modifiedComponent.getObject());
 298                         }
 299                         for (Resource value : parameter.changedResources()) {
 300                                 // No more info => need to check further
 301                                 if(!graph.isImmutable(value))
 302                                         w.addComponentModification(value);
 303                         }
 304                         for (StatementChange change : parameter.changedStatements()) {
 305                             if (DEBUG)
 306                                 LOGGER.info("-stm " + NameUtils.getSafeName(graph, change.getSubject(), true) + " " + NameUtils.getSafeName(graph, change.getPredicate(), true) + " " + NameUtils.getSafeName(graph, change.getObject(), true));
 307                                 Resource subject = change.getSubject();
 308                                 Resource predicate = change.getPredicate();
 309                                 Resource object = change.getObject();
 310                                 if(!object.isPersistent()) continue;
 311                                 if (predicate.equals(l0.ConsistsOf)) {
 312                                         if (change.isClaim())
 313                                                 w.addComponentAddition(subject, object);
 314                                         else
 315                                                 w.addComponentRemoval(subject, object);
 316                                 } else if (predicate.equals(l0.IsLinkedTo)) {
 317                                         w.addLinkChange(subject);
 318                                 } else /*if (graph.isSubrelationOf(predicate, l0.DependsOn))*/ {
 319                                     if (DEBUG)
 320                                         LOGGER.info("-modi " + NameUtils.getSafeName(graph, subject, true));
 321                                         w.addComponentModification(subject);
 322                                 }
 323                         }
 324                         return w.getResult();
 325                 }
 326
 327         };
 328
 329         private static int trackers = 0;
 330
 331         private static ChangeListener listener;
 332
 333         public static void assertFinishedTracking() {
 334             if(trackers != 0) throw new IllegalStateException("Trackers should be 0 (was " + trackers + ")");
 335         }
 336
 337         @Override
 338         public synchronized void untrack(RequestProcessor processor, final Resource model) {
 339
 340             trackers--;
 341
 342             if(trackers < 0) throw new IllegalStateException("Dependency tracking reference count is broken");
 343
 344             if(trackers == 0) {
 345
 346                 if(listener == null) throw new IllegalStateException("Dependency tracking was not active");
 347
 348                 GraphChangeListenerSupport changeSupport = processor.getService(GraphChangeListenerSupport.class);
 349                 changeSupport.removeMetadataListener(listener);
 350                 listener = null;
 351
 352             }
 353
 354         }
 355
 356         @Override
 357         public synchronized void trackAndIndex(RequestProcessor processor, Resource model__) {
 358
 359             if(trackers == 0) {
 360
 361                 if(listener != null) throw new IllegalStateException("Dependency tracking was active");
 362
 363                 listener = new GenericChangeListener<DependencyChangesRequest, DependencyChanges>() {
 364
 365                     @Override
 366                     public boolean preEventRequest() {
 367                         return !Indexing.isDependenciesIndexingDisabled();
 368                     }
 369
 370                     @Override
 371                     public void onEvent(ReadGraph graph, MetadataI metadata, DependencyChanges event) throws DatabaseException {
 372
 373                         TimeLogger.log(DependenciesRelation.class, "trackAndIndex.onEvent: starting index update processing");
 374
 375                         if(DEBUG)
 376                             LOGGER.info("Adding metadata " + event + " in revision " + graph.getService(ManagementSupport.class).getHeadRevisionId());
 377
 378                         WriteGraph w = (WriteGraph)graph;
 379                         if(!event.isEmpty())
 380                                 w.addMetadata(event);
 381
 382                         final Session session = graph.getSession();
 383                         final IndexedRelations indexer = session.getService(IndexedRelations.class);
 384                         Layer0 L0 = Layer0.getInstance(graph);
 385                         SerialisationSupport ss = graph.getService(SerialisationSupport.class);
 386
 387                         for(Map.Entry<Resource, Change[]>  modelEntry : event.get().entrySet()) {
 388
 389                             final Resource model = modelEntry.getKey();
 390                             final Change[] changes = modelEntry.getValue();
 391
 392                             boolean linkChange = false;
 393
 394                             Collection<Object[]> _additions = Collections.emptyList();
 395                             Collection<Object> _removals = Collections.emptyList();
 396                             Collection<Object> _replacementKeys = Collections.emptyList();
 397                             Collection<Object[]> _replacementObjects = Collections.emptyList();
 398                             Collection<Pair<String, String>> _typeChanges = Collections.emptyList();
 399
 400                             if(DEBUG) LOGGER.info("MODEL: " + NameUtils.getSafeLabel(graph, model));
 401                             //                final Change[] changes = event.get(model);
 402                             if(DEBUG) LOGGER.info("  CHANGES: " + Arrays.toString(changes));
 403                             if (changes != null) {
 404                                 _additions = new ArrayList<Object[]>();
 405                                 _removals = new ArrayList<Object>();
 406                                 _replacementKeys = new ArrayList<Object>();
 407                                 _replacementObjects = new ArrayList<Object[]>();
 408                                 _typeChanges = new HashSet<Pair<String, String>>();
 409
 410                                 for (Change _entry : changes) {
 411                                     if (_entry instanceof ComponentAddition) {
 412                                         ComponentAddition entry = (ComponentAddition)_entry;
 413                                         final String name = graph.getPossibleRelatedValue(entry.component, L0.HasName, Bindings.STRING);
 414                                         final GUID id = graph.getPossibleRelatedValue(entry.component, L0.identifier, GUID.BINDING);
 415                                         final String types = graph.syncRequest(new TypeString(L0, graph.getTypes(entry.component)));
 416                                         if (name != null && types != null) {
 417                                                 if(!entry.isValid(graph)) continue;
 418                                             Resource parent = graph.getPossibleObject(entry.component, L0.PartOf);
 419                                             if (parent != null) {
 420                                                 _additions.add(new Object[] { ss.getRandomAccessId(parent), ss.getRandomAccessId(entry.component), name, types, id != null ? id.indexString() : "" });
 421                                             } else {
 422                                                     //LOGGER.info("resource " + entry.component + ": no parent for entry " + name + " " + types);
 423                                             }
 424                                         } else {
 425                                             //LOGGER.info("resource " + entry.component + ": " + name + " " + types);
 426                                         }
 427                                     } else if(_entry instanceof ComponentModification) {
 428                                         ComponentModification entry = (ComponentModification)_entry;
 429                                         final String name = graph.getPossibleRelatedValue(entry.component, L0.HasName, Bindings.STRING);
 430                                         final GUID id = graph.getPossibleRelatedValue(entry.component, L0.identifier, GUID.BINDING);
 431                                         if(graph.isInstanceOf(entry.component, L0.Type)) {
 432                                             SerialisationSupport support = session.getService(SerialisationSupport.class);
 433                                             _typeChanges.add(new Pair<String, String>(name, String.valueOf(support.getRandomAccessId((Resource) entry.component))));
 434                                         } else {
 435                                             final String types = graph.syncRequest(new TypeString(L0, graph.getTypes(entry.component)));
 436                                             if (name != null && types != null) {
 437                                                 Resource part = graph.getPossibleObject(entry.component, L0.PartOf);
 438                                                 if(part != null) {
 439                                                     _replacementKeys.add(ss.getRandomAccessId(entry.component));
 440                                                     _replacementObjects.add(new Object[] { ss.getRandomAccessId(part),
 441                                                             ss.getRandomAccessId(entry.component), name, types, id != null ? id.indexString() : "" });
 442                                                 }
 443                                             }
 444                                         }
 445                                     } else if (_entry instanceof ComponentRemoval) {
 446                                         ComponentRemoval entry = (ComponentRemoval)_entry;
 447                                         if(!entry.isValid(graph)) continue;
 448                                         _removals.add(ss.getRandomAccessId(((ComponentRemoval)_entry).component));
 449                                     } else if (_entry instanceof LinkChange) {
 450                                         linkChange = true;
 451                                     }
 452                                 }
 453                             }
 454
 455                             final boolean reset = linkChange || event.hasUnresolved;
 456                             //LOGGER.info("dependencies(" + NameUtils.getSafeLabel(graph, model) + "): reset=" + reset + " linkChange=" + linkChange + " unresolved=" + event.hasUnresolved );
 457
 458                             if (reset || !_additions.isEmpty() || !_removals.isEmpty() || !_replacementKeys.isEmpty() || !_typeChanges.isEmpty()) {
 459
 460                                 TimeLogger.log(DependenciesRelation.class, "trackAndIndex.onEvent: starting index update");
 461
 462                                 final Collection<Object[]> additions = _additions;
 463                                 final Collection<Object> removals = _removals;
 464                                 final Collection<Object> replacementKeys = _replacementKeys;
 465                                 final Collection<Object[]> replacementObjects = _replacementObjects;
 466                                 final boolean typeNameChanges = typeNameChanges(graph, indexer, model, _typeChanges);
 467
 468                             final UUID pending = Indexing.makeIndexPending();
 469
 470                             {
 471                                 {
 472                                         try {
 473                                             boolean didChange = false;
 474                                             // Unresolved and linkChanges are not relevant any more
 475                                             boolean doReset = typeNameChanges;
 476
 477                                             if (doReset) {
 478
 479                                             if(DEBUG) {
 480                                                 LOGGER.info("resetIndex " + reset + " " + typeNameChanges);
 481                                             }
 482
 483                                                 indexer.removeAll(null, graph, DependenciesRelation.this, resource, model);
 484                                                 didChange = true;
 485
 486                                             } else {
 487
 488                                                 if (!replacementKeys.isEmpty() && (replacementKeys.size() == replacementObjects.size())) {
 489                                                     if(DEBUG) {
 490                                                         LOGGER.info(replacementKeys.size() + " index replacements: " + replacementKeys);
 491                                                     }
 492                                                     didChange |= indexer.replace(null, graph, DependenciesRelation.this, resource, model, Dependencies.FIELD_RESOURCE, replacementKeys, replacementObjects);
 493                                                 }
 494                                                 if (!removals.isEmpty()) {
 495                                                     if(DEBUG) {
 496                                                         LOGGER.info(removals.size() + " index removals: " + removals);
 497                                                     }
 498                                                     indexer.remove(null, graph, DependenciesRelation.this, resource, model, Dependencies.FIELD_RESOURCE, removals);
 499                                                     didChange = true;
 500                                                 }
 501                                                 if (!additions.isEmpty()) {
 502                                                     if(DEBUG) {
 503                                                         for(Object[] os : additions) LOGGER.info("Adding to index " + model + ": " + Arrays.toString(os));
 504                                                     }
 505                                                     //LOGGER.info(additions.size() + " index insertions");
 506                                                     indexer.insert(null, graph, DependenciesRelation.this, resource, model, additions);
 507                                                     didChange = true;
 508                                                 }
 509
 510                                             }
 511
 512                                             if (didChange)
 513                                                 // TODO: because this data is ran with
 514                                                 // ThreadUtils.getBlockingWorkExecutor()
 515                                                 // fireListeners needs to use peekService,
 516                                                 // not getService since there is no
 517                                                 // guarantee that the session isn't being
 518                                                 // disposed while this method is executing.
 519                                                 fireListeners(graph, model);
 520
 521                                         } catch (Throwable t) {
 522                                             // Just to know if something unexpected happens here.
 523                                             LOGGER.error("Dependencies index update failed for model "
 524                                                 + model + " and relation " + resource + ".", t);
 525
 526                                             // NOTE: Last resort: failure to update index
 527                                             // properly results in removal of the whole index.
 528                                             // This is the only thing that can be done
 529                                             // at this point to ensure that the index will
 530                                             // return correct results in the future, through
 531                                             // complete reinitialization.
 532                                             //indexer.removeAll(null, session, DependenciesRelation.this, resource, model);
 533                                         } finally {
 534                                             Indexing.releaseIndexPending(pending);
 535                                             Indexing.clearCaches(model);
 536                                         }
 537                                 }
 538                             }
 539
 540                                 TimeLogger.log(DependenciesRelation.class, "trackAndIndex.onEvent: index update done");
 541                             }
 542                         }
 543
 544                     }
 545
 546                 };
 547
 548                 GraphChangeListenerSupport changeSupport = processor.getService(GraphChangeListenerSupport.class);
 549                 changeSupport.addMetadataListener(listener);
 550
 551             }
 552
 553             trackers++;
 554
 555         }
 556
 557         private boolean typeNameChanges(ReadGraph graph, IndexedRelations indexer,
 558                         Resource model, final Collection<Pair<String, String>> typeChanges)
 559                         throws DatabaseException {
 560                 if (typeChanges.isEmpty())
 561                         return false;
 562
 563                 for (Pair<String, String> nr : typeChanges) {
 564                         String query = Dependencies.FIELD_RESOURCE + ":[" + nr.second + " TO " + nr.second + "]";
 565                         //LOGGER.info("query: " + query);
 566                         List<Map<String, Object>> results = indexer.query(null, query, graph, resource, model, Integer.MAX_VALUE);
 567                         if (results.size() != 1) {
 568                                 return true;
 569                         } else {
 570                                 Map<String, Object> result = results.get(0);
 571                                 if (!ObjectUtils.objectEquals(result.get(Dependencies.FIELD_NAME), nr.first)) {
 572                                         return true;
 573                                 }
 574                         }
 575 //                      LOGGER.info("Type " + nr.first + " was unchanged.");
 576                 }
 577                 return false;
 578         }
 579
 580         @Override
 581         public void addListener(RequestProcessor processor, Resource model, Runnable observer) {
 582                 DependenciesListenerStore store = processor.getSession().getService(DependenciesListenerStore.class);
 583                 store.addListener(model, observer);
 584         }
 585
 586         @Override
 587         public void removeListener(RequestProcessor processor, Resource model, Runnable observer) {
 588                 DependenciesListenerStore store = processor.getSession().getService(DependenciesListenerStore.class);
 589                 store.removeListener(model, observer);
 590         }
 591
 592         void fireListeners(RequestProcessor processor, Resource model) {
 593                 DependenciesListenerStore store = processor.getSession().peekService(DependenciesListenerStore.class);
 594                 if (store != null)
 595                         store.fireListeners(model);
 596         }
 597
 598         @Override
 599         public void reset(RequestProcessor processor, Resource input) {
 600                 if (DEBUG) {
 601                         LOGGER.info("DependenciesRelation.reset: " + input);
 602                         new Exception("DependenciesRelation.reset(" + listener + ")").printStackTrace(System.out);
 603                 }
 604                 DependenciesListenerStore store = processor.getSession().getService(DependenciesListenerStore.class);
 605                 store.fireListeners(input);
 606         }
 607
 608         public static void addSubtree(ReadGraph graph, Resource root) throws DatabaseException {
 609
 610                 Resource indexRoot = graph.syncRequest(new IndexRoot(root));
 611                 addSubtree(graph, indexRoot, root);
 612
 613         }
 614
 615         public static void addSubtree(ReadGraph graph, Resource indexRoot, Resource subtreeRoot) throws DatabaseException {
 616
 617                 DependenciesRelation dr = new DependenciesRelation(graph, indexRoot);
 618         SerialisationSupport ss = graph.getService(SerialisationSupport.class);
 619
 620         ArrayList<Entry> entries = dr.find(graph, subtreeRoot);
 621         entries.add(new Entry(graph, subtreeRoot));
 622
 623                 ArrayList<Object[]> result = new ArrayList<Object[]>(entries.size());
 624                 for (Entry entry : entries) {
 625                         result.add(new Object[] { ss.getRandomAccessId(entry.parent), ss.getRandomAccessId(entry.resource), entry.name, entry.types, entry.id });
 626                 }
 627
 628                 Layer0X L0X = Layer0X.getInstance(graph);
 629         IndexedRelations indexer = graph.getService(IndexedRelations.class);
 630         indexer.insert(null, graph, dr, L0X.DependenciesRelation, indexRoot, result);
 631
 632         }
 633
 634 }