gerrit.simantics Code Review - simantics/platform.git/blob

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