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.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                 Pair.make(Dependencies.FIELD_NAME_SEARCH, "Text"),
  82                 Pair.make(Dependencies.FIELD_TYPES_SEARCH, "Text")
  83         };
  84
  85         final Resource resource;
  86
  87         public DependenciesRelation(ReadGraph graph, Resource resource) {
  88                 this.resource = resource;
  89                 synchronized(this) {
  90                         Session session = graph.getSession();
  91                         DependenciesListenerStore store = session.peekService(DependenciesListenerStore.class);
  92                         if(store == null) session.registerService(DependenciesListenerStore.class, new DependenciesListenerStore());
  93                 }
  94         }
  95
  96         class Process {
  97
  98                 final ArrayList<Entry> result = new ArrayList<Entry>();
  99                 final SyncContextMultiProcedure<Resource, Resource> structure;
 100                 final SyncContextProcedure<Entry, String> names;
 101                 final SyncContextProcedure<Entry, Resource> type;
 102
 103                 Process(ReadGraph graph, final Resource resource) throws DatabaseException {
 104
 105                         final Layer0 L0 = Layer0.getInstance(graph);
 106                         final DirectQuerySupport dqs = graph.getService(DirectQuerySupport.class);
 107                         final CollectionSupport cs = graph.getService(CollectionSupport.class);
 108
 109                         names = dqs.compilePossibleRelatedValue(graph, L0.HasName, new SyncContextProcedure<Entry, String>() {
 110
 111                                 @Override
 112                                 public void execute(ReadGraph graph, Entry entry, String name) {
 113                                         entry.name = name;
 114                                 }
 115
 116                                 @Override
 117                                 public void exception(ReadGraph graph, Throwable throwable) {
 118                                         LOGGER.error("Could not compile possible related value for resource {}", resource, throwable);
 119                                 }
 120
 121                         });
 122
 123                         type = new SyncContextProcedure<Entry, Resource>() {
 124
 125                                 @Override
 126                                 public void execute(ReadGraph graph, Entry entry, Resource type) {
 127                                         entry.principalType = type;
 128                                 }
 129
 130                                 @Override
 131                                 public void exception(ReadGraph graph, Throwable throwable) {
 132                                         LOGGER.error("Could not find type for resource {}", resource, throwable);
 133                                 }
 134
 135                         };
 136
 137                         structure = dqs.compileForEachObject(graph, L0.ConsistsOf, new SyncContextMultiProcedure<Resource, Resource>() {
 138
 139                                 @Override
 140                                 public void execute(ReadGraph graph, Resource parent, Resource child) {
 141                                         // WORKAROUND: don't browse virtual child resources
 142                                         if(!child.isPersistent()) return;
 143                                         Entry entry = new Entry(parent, child, "", "", "");
 144                                         result.add(entry);
 145                                         dqs.forEachObjectCompiled(graph, child, child, structure);
 146                                         dqs.forPossibleRelatedValueCompiled(graph, child, entry, names);
 147                                         dqs.forPossibleDirectType(graph, child, entry, type);
 148                                 }
 149
 150                                 @Override
 151                                 public void finished(ReadGraph graph, Resource parent) {
 152                                 }
 153
 154                                 @Override
 155                                 public void exception(ReadGraph graph, Throwable throwable) {
 156                                     if (throwable instanceof NoSingleResultException) {
 157                                         // Ignore
 158                                         if (LOGGER.isDebugEnabled())
 159                                             LOGGER.debug("Could not compile for resource {}", resource, throwable);
 160                                     } else {
 161                                         LOGGER.error("Could not compile for resource {}", resource, throwable);
 162                                     }
 163                                 }
 164
 165                         });
 166
 167                         result.add(new Entry(graph, resource));
 168
 169                         graph.syncRequest(new ReadRequest() {
 170
 171                                 @Override
 172                                 public void run(ReadGraph graph) throws DatabaseException {
 173                                         dqs.forEachObjectCompiled(graph, resource, resource, structure);
 174                                 }
 175
 176                         });
 177
 178             Map<Resource, String> typeStrings = cs.createMap(String.class);
 179                         for(Entry e : result) {
 180                                 if(e.principalType != null) {
 181                                     String typeString = typeStrings.get(e.principalType);
 182                                     if(typeString == null) {
 183                                         typeString = graph.syncRequest(new SuperTypeString(e.principalType));
 184                                         if (typeString.isEmpty()) {
 185                                             LOGGER.error("No name for type", new DatabaseException("No name for type " + NameUtils.getURIOrSafeNameInternal(graph, e.resource) + " (" + e.resource + ")"));
 186                                         }
 187                                         typeStrings.put(e.principalType, typeString);
 188                                     }
 189                                     e.types = typeString;
 190                                 } else {
 191                                     e.types = graph.syncRequest(new TypeString(L0, graph.getTypes(e.resource)));
 192                                 }
 193                                 GUID id = graph.getPossibleRelatedValue(e.resource, L0.identifier, GUID.BINDING);
 194                                 if(id != null)
 195                                         e.id = id.indexString();
 196                                 else
 197                                         e.id = "";
 198                         }
 199
 200                         //SessionGarbageCollection.gc(null, graph.getSession(), false, null);
 201
 202                 }
 203
 204         }
 205
 206         public ArrayList<Entry> find(ReadGraph graph, final Resource model) throws DatabaseException {
 207                 return new Process(graph, model).result;
 208         }
 209
 210         @Override
 211         public GenericRelation select(String bindingPattern, Object[] constants) {
 212                 checkSelectionArguments(bindingPattern, constants, new String[] { Dependencies.getBindingPattern() });
 213                 final long subjectId = (Long)constants[0];
 214                 return new UnsupportedRelation() {
 215
 216                         @Override
 217                         public boolean isRealizable() {
 218                                 return true;
 219                         }
 220
 221                         @Override
 222                         final public List<Object[]> realize(ReadGraph graph) throws DatabaseException {
 223
 224                                 long time = System.nanoTime();
 225
 226                 SerialisationSupport ss = graph.getService(SerialisationSupport.class);
 227
 228                                 Resource subject = ss.getResource(subjectId);
 229
 230                                 Collection<Entry> entries = find(graph, subject);
 231
 232                                 long time2 = System.nanoTime();
 233
 234                                 if (PROFILE)
 235                                         LOGGER.info("Found " + entries.size() + " dependencies in " + 1e-6 * (time2 - time) + "ms for " + graph.getPossibleURI(subject) + ".");
 236
 237                                 ArrayList<Object[]> result = new ArrayList<Object[]>();
 238                                 for (Entry entry : entries) {
 239                                         if(entry.name == null) continue;
 240                                         result.add(new Object[] { ss.getRandomAccessId(entry.parent), ss.getRandomAccessId(entry.resource), entry.name, entry.types, entry.id, entry.name, entry.types });
 241                                 }
 242                                 return result;
 243
 244                         }
 245
 246                 };
 247         }
 248
 249         @Override
 250         public Pair<String, String>[] getFields() {
 251                 return fields;
 252         }
 253
 254         @Override
 255         public List<Map<String, Object>> query(RequestProcessor session, String search, String bindingPattern, Object[] constants, int maxResultCount) {
 256                 if(!Dependencies.getBindingPattern().equals(bindingPattern)) throw new IllegalArgumentException("DependenciesRelation supports indexing only with 'bfffffff'");
 257                 IndexedRelations indexer = session.getService(IndexedRelations.class);
 258                 return indexer.query(null, search, session, resource, (Resource)constants[0], maxResultCount);
 259         }
 260
 261         @Override
 262         public List<Resource> queryResources(RequestProcessor session, String search, String bindingPattern, Object[] constants, int maxResultCount) {
 263                 if(!Dependencies.getBindingPattern().equals(bindingPattern)) throw new IllegalArgumentException("DependenciesRelation supports indexing only with 'bfffffff'");
 264                 IndexedRelations indexer = session.getService(IndexedRelations.class);
 265                 return indexer.queryResources(null, search, session, resource, (Resource)constants[0], maxResultCount);
 266         }
 267
 268         @Override
 269         public List<Map<String, Object>> list(RequestProcessor session, String bindingPattern, Object[] constants, int maxResultCount) {
 270                 if(!Dependencies.getBindingPattern().equals(bindingPattern)) throw new IllegalArgumentException("DependenciesRelation supports indexing only with 'bfffffff'");
 271                 IndexedRelations indexer = session.getService(IndexedRelations.class);
 272                 return indexer.query(null, null, session, resource, (Resource)constants[0], maxResultCount);
 273         }
 274
 275         public static class DependencyChangesRequest extends UnaryRead<ChangeSet, DependencyChanges> {
 276
 277                 @SuppressWarnings("unused")
 278                 final private static boolean LOG = false;
 279
 280                 public DependencyChangesRequest(ChangeSet parameter) {
 281                         super(parameter);
 282                 }
 283
 284                 @Override
 285                 public DependencyChanges perform(ReadGraph graph) throws DatabaseException {
 286
 287                         DependencyChangesWriter w = new DependencyChangesWriter(graph);
 288                         Layer0 l0 = w.l0;
 289                         Resource changeInformation = graph.getPossibleResource("http://www.simantics.org/Modeling-1.2/changeInformation/Inverse");
 290
 291                         for (Resource value : parameter.changedValues()) {
 292                                 if(!value.isPersistent()) continue;
 293                                 Statement modifiedComponent = graph.getPossibleStatement(value, l0.PropertyOf);
 294                                 if (modifiedComponent == null
 295                                                 || modifiedComponent.getPredicate().equals(changeInformation))
 296                                         continue;
 297                                 if (DEBUG) {
 298                                     LOGGER.info("+comp modi " + NameUtils.getSafeName(graph, modifiedComponent.getObject(), true));
 299                                     LOGGER.info("    +value " + NameUtils.getSafeName(graph, value, true));
 300                                 }
 301                                 w.addComponentModification(modifiedComponent.getObject());
 302                         }
 303                         for (Resource value : parameter.changedResources()) {
 304                                 // No more info => need to check further
 305                                 if(!graph.isImmutable(value))
 306                                         w.addComponentModification(value);
 307                         }
 308                         for (StatementChange change : parameter.changedStatements()) {
 309                             if (DEBUG)
 310                                 LOGGER.info("-stm " + NameUtils.getSafeName(graph, change.getSubject(), true) + " " + NameUtils.getSafeName(graph, change.getPredicate(), true) + " " + NameUtils.getSafeName(graph, change.getObject(), true));
 311                                 Resource subject = change.getSubject();
 312                                 Resource predicate = change.getPredicate();
 313                                 Resource object = change.getObject();
 314                                 if(!object.isPersistent()) continue;
 315                                 if (predicate.equals(l0.ConsistsOf)) {
 316                                         if (change.isClaim())
 317                                                 w.addComponentAddition(subject, object);
 318                                         else
 319                                                 w.addComponentRemoval(subject, object);
 320                                 } else if (predicate.equals(l0.IsLinkedTo)) {
 321                                         w.addLinkChange(subject);
 322                                 } else /*if (graph.isSubrelationOf(predicate, l0.DependsOn))*/ {
 323                                     if (DEBUG)
 324                                         LOGGER.info("-modi " + NameUtils.getSafeName(graph, subject, true));
 325                                         w.addComponentModification(subject);
 326                                 }
 327                         }
 328                         return w.getResult();
 329                 }
 330
 331         };
 332
 333         private static int trackers = 0;
 334
 335         private static ChangeListener listener;
 336
 337         public static void assertFinishedTracking() {
 338             if(trackers != 0) throw new IllegalStateException("Trackers should be 0 (was " + trackers + ")");
 339         }
 340
 341         @Override
 342         public synchronized void untrack(RequestProcessor processor, final Resource model) {
 343
 344             trackers--;
 345
 346             if(trackers < 0) throw new IllegalStateException("Dependency tracking reference count is broken");
 347
 348             if(trackers == 0) {
 349
 350                 if(listener == null) throw new IllegalStateException("Dependency tracking was not active");
 351
 352                 GraphChangeListenerSupport changeSupport = processor.getService(GraphChangeListenerSupport.class);
 353                 changeSupport.removeMetadataListener(listener);
 354                 listener = null;
 355
 356             }
 357
 358         }
 359
 360         @Override
 361         public synchronized void trackAndIndex(RequestProcessor processor, Resource model__) {
 362
 363             if(trackers == 0) {
 364
 365                 if(listener != null) throw new IllegalStateException("Dependency tracking was active");
 366
 367                 listener = new GenericChangeListener<DependencyChangesRequest, DependencyChanges>() {
 368
 369                     @Override
 370                     public boolean preEventRequest() {
 371                         return !Indexing.isDependenciesIndexingDisabled();
 372                     }
 373
 374                     @Override
 375                     public void onEvent(ReadGraph graph, MetadataI metadata, DependencyChanges event) throws DatabaseException {
 376
 377                         TimeLogger.log(DependenciesRelation.class, "trackAndIndex.onEvent: starting index update processing");
 378
 379                         if(DEBUG)
 380                             LOGGER.info("Adding metadata " + event + " in revision " + graph.getService(ManagementSupport.class).getHeadRevisionId());
 381
 382                         WriteGraph w = (WriteGraph)graph;
 383                         if(!event.isEmpty())
 384                                 w.addMetadata(event);
 385
 386                         final Session session = graph.getSession();
 387                         final IndexedRelations indexer = session.getService(IndexedRelations.class);
 388                         Layer0 L0 = Layer0.getInstance(graph);
 389                         SerialisationSupport ss = graph.getService(SerialisationSupport.class);
 390
 391                         for(Map.Entry<Resource, Change[]>  modelEntry : event.get().entrySet()) {
 392
 393                             final Resource model = modelEntry.getKey();
 394                             final Change[] changes = modelEntry.getValue();
 395
 396                             boolean linkChange = false;
 397
 398                             Collection<Object[]> _additions = Collections.emptyList();
 399                             Collection<Object> _removals = Collections.emptyList();
 400                             Collection<Object> _replacementKeys = Collections.emptyList();
 401                             Collection<Object[]> _replacementObjects = Collections.emptyList();
 402                             Collection<Pair<String, String>> _typeChanges = Collections.emptyList();
 403
 404                             if(DEBUG) LOGGER.info("MODEL: " + NameUtils.getSafeLabel(graph, model));
 405                             //                final Change[] changes = event.get(model);
 406                             if(DEBUG) LOGGER.info("  CHANGES: " + Arrays.toString(changes));
 407                             if (changes != null) {
 408                                 _additions = new ArrayList<Object[]>();
 409                                 _removals = new ArrayList<Object>();
 410                                 _replacementKeys = new ArrayList<Object>();
 411                                 _replacementObjects = new ArrayList<Object[]>();
 412                                 _typeChanges = new HashSet<Pair<String, String>>();
 413
 414                                 for (Change _entry : changes) {
 415                                     if (_entry instanceof ComponentAddition) {
 416                                         ComponentAddition entry = (ComponentAddition)_entry;
 417                                         final String name = graph.getPossibleRelatedValue(entry.component, L0.HasName, Bindings.STRING);
 418                                         final GUID id = graph.getPossibleRelatedValue(entry.component, L0.identifier, GUID.BINDING);
 419                                         final String types = graph.syncRequest(new TypeString(L0, graph.getTypes(entry.component)));
 420                                         if (name != null && types != null) {
 421                                                 if(!entry.isValid(graph)) continue;
 422                                             Resource parent = graph.getPossibleObject(entry.component, L0.PartOf);
 423                                             if (parent != null) {
 424                                                 _additions.add(new Object[] { ss.getRandomAccessId(parent), ss.getRandomAccessId(entry.component), name, types, id != null ? id.indexString() : "", name, types});
 425                                             } else {
 426                                                     //LOGGER.info("resource " + entry.component + ": no parent for entry " + name + " " + types);
 427                                             }
 428                                         } else {
 429                                             //LOGGER.info("resource " + entry.component + ": " + name + " " + types);
 430                                         }
 431                                     } else if(_entry instanceof ComponentModification) {
 432                                         ComponentModification entry = (ComponentModification)_entry;
 433                                         final String name = graph.getPossibleRelatedValue(entry.component, L0.HasName, Bindings.STRING);
 434                                         final GUID id = graph.getPossibleRelatedValue(entry.component, L0.identifier, GUID.BINDING);
 435                                         if(graph.isInstanceOf(entry.component, L0.Type)) {
 436                                             SerialisationSupport support = session.getService(SerialisationSupport.class);
 437                                             _typeChanges.add(new Pair<String, String>(name, String.valueOf(support.getRandomAccessId((Resource) entry.component))));
 438                                         } else {
 439                                             final String types = graph.syncRequest(new TypeString(L0, graph.getTypes(entry.component)));
 440                                             if (name != null && types != null) {
 441                                                 Resource part = graph.getPossibleObject(entry.component, L0.PartOf);
 442                                                 if(part != null) {
 443                                                     _replacementKeys.add(ss.getRandomAccessId(entry.component));
 444                                                     _replacementObjects.add(new Object[] { ss.getRandomAccessId(part),
 445                                                             ss.getRandomAccessId(entry.component), name, types, id != null ? id.indexString() : "", name, types});
 446                                                 }
 447                                             }
 448                                         }
 449                                     } else if (_entry instanceof ComponentRemoval) {
 450                                         ComponentRemoval entry = (ComponentRemoval)_entry;
 451                                         if(!entry.isValid(graph)) continue;
 452                                         _removals.add(ss.getRandomAccessId(((ComponentRemoval)_entry).component));
 453                                     } else if (_entry instanceof LinkChange) {
 454                                         linkChange = true;
 455                                     }
 456                                 }
 457                             }
 458
 459                             final boolean reset = linkChange || event.hasUnresolved;
 460                             //LOGGER.info("dependencies(" + NameUtils.getSafeLabel(graph, model) + "): reset=" + reset + " linkChange=" + linkChange + " unresolved=" + event.hasUnresolved );
 461
 462                             if (reset || !_additions.isEmpty() || !_removals.isEmpty() || !_replacementKeys.isEmpty() || !_typeChanges.isEmpty()) {
 463
 464                                 TimeLogger.log(DependenciesRelation.class, "trackAndIndex.onEvent: starting index update");
 465
 466                                 final Collection<Object[]> additions = _additions;
 467                                 final Collection<Object> removals = _removals;
 468                                 final Collection<Object> replacementKeys = _replacementKeys;
 469                                 final Collection<Object[]> replacementObjects = _replacementObjects;
 470                                 final boolean typeNameChanges = typeNameChanges(graph, indexer, model, _typeChanges);
 471
 472                             final UUID pending = Indexing.makeIndexPending();
 473
 474                             {
 475                                 {
 476                                         try {
 477                                             boolean didChange = false;
 478                                             // Unresolved and linkChanges are not relevant any more
 479                                             boolean doReset = typeNameChanges;
 480
 481                                             if (doReset) {
 482
 483                                             if(DEBUG) {
 484                                                 LOGGER.info("resetIndex " + reset + " " + typeNameChanges);
 485                                             }
 486
 487                                                 indexer.removeAll(null, graph, DependenciesRelation.this, resource, model);
 488                                                 didChange = true;
 489
 490                                             } else {
 491
 492                                                 if (!replacementKeys.isEmpty() && (replacementKeys.size() == replacementObjects.size())) {
 493                                                     if(DEBUG) {
 494                                                         LOGGER.info(replacementKeys.size() + " index replacements: " + replacementKeys);
 495                                                     }
 496                                                     didChange |= indexer.replace(null, graph, DependenciesRelation.this, resource, model, Dependencies.FIELD_RESOURCE, replacementKeys, replacementObjects);
 497                                                 }
 498                                                 if (!removals.isEmpty()) {
 499                                                     if(DEBUG) {
 500                                                         LOGGER.info(removals.size() + " index removals: " + removals);
 501                                                     }
 502                                                     indexer.remove(null, graph, DependenciesRelation.this, resource, model, Dependencies.FIELD_RESOURCE, removals);
 503                                                     didChange = true;
 504                                                 }
 505                                                 if (!additions.isEmpty()) {
 506                                                     if(DEBUG) {
 507                                                         for(Object[] os : additions) LOGGER.info("Adding to index " + model + ": " + Arrays.toString(os));
 508                                                     }
 509                                                     //LOGGER.info(additions.size() + " index insertions");
 510                                                     indexer.insert(null, graph, DependenciesRelation.this, resource, model, additions);
 511                                                     didChange = true;
 512                                                 }
 513
 514                                             }
 515
 516                                             if (didChange)
 517                                                 // TODO: because this data is ran with
 518                                                 // ThreadUtils.getBlockingWorkExecutor()
 519                                                 // fireListeners needs to use peekService,
 520                                                 // not getService since there is no
 521                                                 // guarantee that the session isn't being
 522                                                 // disposed while this method is executing.
 523                                                 fireListeners(graph, model);
 524
 525                                         } catch (Throwable t) {
 526                                             // Just to know if something unexpected happens here.
 527                                             LOGGER.error("Dependencies index update failed for model "
 528                                                 + model + " and relation " + resource + ".", t);
 529
 530                                             // NOTE: Last resort: failure to update index
 531                                             // properly results in removal of the whole index.
 532                                             // This is the only thing that can be done
 533                                             // at this point to ensure that the index will
 534                                             // return correct results in the future, through
 535                                             // complete reinitialization.
 536                                             //indexer.removeAll(null, session, DependenciesRelation.this, resource, model);
 537                                         } finally {
 538                                             Indexing.releaseIndexPending(pending);
 539                                             Indexing.clearCaches(model);
 540                                         }
 541                                 }
 542                             }
 543
 544                                 TimeLogger.log(DependenciesRelation.class, "trackAndIndex.onEvent: index update done");
 545                             }
 546                         }
 547
 548                     }
 549
 550                 };
 551
 552                 GraphChangeListenerSupport changeSupport = processor.getService(GraphChangeListenerSupport.class);
 553                 changeSupport.addMetadataListener(listener);
 554
 555             }
 556
 557             trackers++;
 558
 559         }
 560
 561         private boolean typeNameChanges(ReadGraph graph, IndexedRelations indexer,
 562                         Resource model, final Collection<Pair<String, String>> typeChanges)
 563                         throws DatabaseException {
 564                 if (typeChanges.isEmpty())
 565                         return false;
 566
 567                 for (Pair<String, String> nr : typeChanges) {
 568                         String query = Dependencies.FIELD_RESOURCE + ":[" + nr.second + " TO " + nr.second + "]";
 569                         //LOGGER.info("query: " + query);
 570                         List<Map<String, Object>> results = indexer.query(null, query, graph, resource, model, Integer.MAX_VALUE);
 571                         if (results.size() != 1) {
 572                                 return true;
 573                         } else {
 574                                 Map<String, Object> result = results.get(0);
 575                                 if (!ObjectUtils.objectEquals(result.get(Dependencies.FIELD_NAME), nr.first)) {
 576                                         return true;
 577                                 }
 578                         }
 579 //                      LOGGER.info("Type " + nr.first + " was unchanged.");
 580                 }
 581                 return false;
 582         }
 583
 584         @Override
 585         public void addListener(RequestProcessor processor, Resource model, Runnable observer) {
 586                 DependenciesListenerStore store = processor.getSession().getService(DependenciesListenerStore.class);
 587                 store.addListener(model, observer);
 588         }
 589
 590         @Override
 591         public void removeListener(RequestProcessor processor, Resource model, Runnable observer) {
 592                 DependenciesListenerStore store = processor.getSession().getService(DependenciesListenerStore.class);
 593                 store.removeListener(model, observer);
 594         }
 595
 596         void fireListeners(RequestProcessor processor, Resource model) {
 597                 DependenciesListenerStore store = processor.getSession().peekService(DependenciesListenerStore.class);
 598                 if (store != null)
 599                         store.fireListeners(model);
 600         }
 601
 602         @Override
 603         public void reset(RequestProcessor processor, Resource input) {
 604                 if (DEBUG) {
 605                         LOGGER.info("DependenciesRelation.reset: " + input);
 606                         new Exception("DependenciesRelation.reset(" + listener + ")").printStackTrace(System.out);
 607                 }
 608                 DependenciesListenerStore store = processor.getSession().getService(DependenciesListenerStore.class);
 609                 store.fireListeners(input);
 610         }
 611
 612         public static void addSubtree(ReadGraph graph, Resource root) throws DatabaseException {
 613
 614                 Resource indexRoot = graph.syncRequest(new IndexRoot(root));
 615                 addSubtree(graph, indexRoot, root);
 616
 617         }
 618
 619         public static void addSubtree(ReadGraph graph, Resource indexRoot, Resource subtreeRoot) throws DatabaseException {
 620
 621                 DependenciesRelation dr = new DependenciesRelation(graph, indexRoot);
 622         SerialisationSupport ss = graph.getService(SerialisationSupport.class);
 623
 624         ArrayList<Entry> entries = dr.find(graph, subtreeRoot);
 625         entries.add(new Entry(graph, subtreeRoot));
 626
 627                 ArrayList<Object[]> result = new ArrayList<Object[]>(entries.size());
 628                 for (Entry entry : entries) {
 629                         result.add(new Object[] { ss.getRandomAccessId(entry.parent), ss.getRandomAccessId(entry.resource), entry.name, entry.types, entry.id, entry.name, entry.types });
 630                 }
 631
 632                 Layer0X L0X = Layer0X.getInstance(graph);
 633         IndexedRelations indexer = graph.getService(IndexedRelations.class);
 634         indexer.insert(null, graph, dr, L0X.DependenciesRelation, indexRoot, result);
 635
 636         }
 637
 638 }