bundles/org.simantics.db.common/src/org/simantics/db/common/utils/Transaction.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007 VTT Technical Research Centre of Finland and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  *
   8  * Contributors:
   9  *     VTT Technical Research Centre of Finland - initial API and implementation
  10  *******************************************************************************/
  11 package org.simantics.db.common.utils;
  12
  13 import java.util.Collection;
  14 import java.util.Set;
  15 import java.util.concurrent.Semaphore;
  16 import java.util.function.Consumer;
  17
  18 import org.simantics.databoard.accessor.Accessor;
  19 import org.simantics.databoard.binding.Binding;
  20 import org.simantics.databoard.type.Datatype;
  21 import org.simantics.db.AsyncRequestProcessor;
  22 import org.simantics.db.ReadGraph;
  23 import org.simantics.db.RequestProcessor;
  24 import org.simantics.db.Resource;
  25 import org.simantics.db.Statement;
  26 import org.simantics.db.WriteGraph;
  27 import org.simantics.db.WriteOnlyGraph;
  28 import org.simantics.db.common.request.DelayedWriteRequest;
  29 import org.simantics.db.exception.AdaptionException;
  30 import org.simantics.db.exception.BindingException;
  31 import org.simantics.db.exception.CancelTransactionException;
  32 import org.simantics.db.exception.DatabaseException;
  33 import org.simantics.db.exception.DoesNotContainValueException;
  34 import org.simantics.db.exception.ManyObjectsForFunctionalRelationException;
  35 import org.simantics.db.exception.NoInverseException;
  36 import org.simantics.db.exception.NoSingleResultException;
  37 import org.simantics.db.exception.ResourceNotFoundException;
  38 import org.simantics.db.exception.RuntimeDatabaseException;
  39 import org.simantics.db.exception.ServiceException;
  40 import org.simantics.db.exception.ValidationException;
  41 import org.simantics.db.procedure.Procedure;
  42 import org.simantics.db.request.DelayedWrite;
  43 import org.simantics.db.request.Read;
  44 import org.simantics.db.request.Write;
  45
  46 /**
  47  * Synchronous Transaction. <p>
  48  *
  49  * Hint: Import all methods as static.
  50  * import static org.simantics.db.Transaction.*;
  51  *
  52  * Remember also to change Eclipse Preferences:
  53  *   Organize Imports: number of static imports needed for .* on vakiona 99, siihen vaikka 3
  54  *
  55  *
  56  * Usage A:
  57  *
  58  * startTransaction(session, true);
  59  * try {
  60  *  ...
  61  *    commit();
  62  * } finally {
  63  *    endTransaction();
  64  * }
  65  *
  66  * Usage B:
  67  * setGraph(g);
  68  * ...
  69  * setGraph(null);
  70  *
  71  * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
  72  */
  73 public class Transaction {
  74
  75         public static enum Type {
  76                 READ,
  77                 WRITE,
  78                 DELAYED_WRITE
  79         }
  80
  81         /** Thread local transactions */
  82         private static ThreadLocal<TransactionInfo> transactions = new ThreadLocal<TransactionInfo>();
  83
  84         static private class TransactionInfo {
  85                 WriteGraph wg;
  86                 ReadGraph rg;
  87
  88                 /** Semaphore that is released when the transaction is complete */
  89                 Semaphore ts;
  90
  91                 /** Semaphore that is release after transaction ended */
  92                 Semaphore es;
  93
  94                 /** Error */
  95                 DatabaseException error;
  96
  97                 /** */
  98                 boolean commit = false;
  99
 100                 TransactionInfo() {
 101                 }
 102
 103                 TransactionInfo(Object graph) {
 104                         if (graph instanceof WriteGraph) {
 105                                 wg = (WriteGraph) graph;
 106                                 rg = (ReadGraph) graph;
 107                         } else if (graph instanceof ReadGraph) {
 108                                 wg = null;
 109                                 rg = (ReadGraph) graph;
 110                         } else {
 111                                 throw new RuntimeDatabaseException("Not a sync graph");
 112                         }
 113                 }
 114         }
 115
 116         public static ReadGraph readGraph() {
 117                 TransactionInfo t = transactions.get();
 118                 return t == null ? null : t.rg;
 119         }
 120
 121         public static WriteGraph writeGraph() {
 122                 TransactionInfo t = transactions.get();
 123                 return t == null ? null : t.wg;
 124         }
 125
 126         public static Object setGraph(Object graph) {
 127                 if (graph==null) {
 128                         transactions.set(null);
 129                         return null;
 130                 }
 131
 132                 {
 133                         Object oldGraph = null;
 134                         TransactionInfo t = transactions.get();
 135                         if (t!=null) {
 136                                 oldGraph = t.rg;
 137                                 if (graph instanceof WriteGraph) {
 138                                         t.wg = (WriteGraph) graph;
 139                                         t.rg = (ReadGraph) graph;
 140                                 } else if (graph instanceof ReadGraph) {
 141                                         t.wg = null;
 142                                         t.rg = (ReadGraph) graph;
 143                                 } else {
 144                                         throw new RuntimeDatabaseException("Not a sync graph");
 145                                 }
 146                         } else {
 147                                 t = new TransactionInfo(graph);
 148                         }
 149                         transactions.set(t);
 150                         return oldGraph;
 151                 }
 152         }
 153
 154         public static void startTransaction(AsyncRequestProcessor processor, boolean write) throws DatabaseException {
 155                 startTransaction(processor, write ? Type.WRITE : Type.READ);
 156         }
 157
 158         public static void startTransaction(AsyncRequestProcessor processor, Type type) throws DatabaseException {
 159                 switch (type) {
 160                         case READ:
 161                         {
 162                                 if (transactions.get()!=null) throw new RuntimeDatabaseException("There is already a transaction.");
 163                                 final Semaphore started = new Semaphore(0);
 164                                 final TransactionInfo t = new TransactionInfo();
 165                                 t.es = new Semaphore(0);
 166                                 t.ts = new Semaphore(0);
 167                                 transactions.set(t);
 168
 169                                 Read<Object> request = new Read<Object>() {
 170                                         @Override
 171                                         public Object perform(ReadGraph g) throws DatabaseException {
 172                                                 t.wg = null;
 173                                                 t.rg = g;
 174                                                 started.release();
 175                                                 try {
 176                                                         t.ts.acquire();
 177                                                 } catch (InterruptedException e) {
 178                                                 }
 179                                                 return null;
 180                                         }
 181                                 };
 182                                 Procedure<Object> procedure = new Procedure<Object>() {
 183                                     @Override
 184                                     public void execute(Object result) {
 185                                         t.es.release(9999);
 186                                     }
 187                                     @Override
 188                                     public void exception(Throwable ex) {
 189                                         if (ex instanceof DatabaseException)
 190                                             t.error = (DatabaseException) ex;
 191                                         else {
 192                                             t.error = new DatabaseException(ex);
 193                                         }
 194                                         t.es.release(9999);
 195                                     }
 196                                 };
 197
 198                                 processor.asyncRequest(request, procedure);
 199
 200                                 // Wait until transaction has started
 201                                 try {
 202                                         // Sleep this thread until transaction has started
 203                                         started.acquire(1);
 204                                 } catch (InterruptedException e) {
 205                                         throw new DatabaseException("Thread was interrupted.");
 206                                 } finally {
 207                                 }
 208                         }
 209                         break;
 210
 211                         case WRITE:
 212                         {
 213                                 if (transactions.get()!=null) throw new RuntimeDatabaseException("There is already a transaction.");
 214                                 final Semaphore started = new Semaphore(0);
 215                                 final TransactionInfo t = new TransactionInfo();
 216                                 t.es = new Semaphore(0);
 217                                 t.ts = new Semaphore(0);
 218                                 transactions.set(t);
 219
 220                                 Consumer<DatabaseException> callback = parameter -> {
 221                                         t.error = parameter;
 222                                         t.es.release(9999);
 223                                 };
 224
 225                                 Write request =  new Write() {
 226                                         @Override
 227                                         public void perform(WriteGraph g) throws DatabaseException {
 228                                                 t.wg = g;
 229                                                 t.rg = g;
 230                                                 started.release();
 231                                                 try {
 232                                                         t.ts.acquire();
 233                                                 } catch (InterruptedException e) {
 234                                                 }
 235                                                 if (!t.commit) throw new CancelTransactionException();
 236                                         }
 237                                 };
 238
 239                                 processor.asyncRequest( request, callback );
 240
 241                                 // Wait until transaction has started
 242                                 try {
 243                                         // Sleep this thread until transaction has started
 244                                         started.acquire(1);
 245                                 } catch (InterruptedException e) {
 246                                         throw new DatabaseException("Thread was interrupted.");
 247                                 } finally {
 248                                 }
 249                         }
 250                         break;
 251
 252                         case DELAYED_WRITE:
 253                         {
 254                                 if (transactions.get()!=null) throw new RuntimeDatabaseException("There is already a transaction.");
 255                                 final Semaphore started = new Semaphore(0);
 256                                 final TransactionInfo t = new TransactionInfo();
 257                                 t.es = new Semaphore(0);
 258                                 t.ts = new Semaphore(0);
 259                                 transactions.set(t);
 260
 261                                 Consumer<DatabaseException> callback = parameter -> {
 262                                         t.error = parameter;
 263                                         t.es.release(9999);
 264                                 };
 265
 266                                 DelayedWrite request =  new DelayedWriteRequest() {
 267                                         @Override
 268                                         public void perform(WriteGraph g) throws DatabaseException {
 269                                                 t.wg = g;
 270                                                 t.rg = g;
 271                                                 started.release();
 272                                                 try {
 273                                                         t.ts.acquire();
 274                                                 } catch (InterruptedException e) {
 275                                                 }
 276                                                 if (!t.commit) throw new CancelTransactionException();
 277                                         }
 278                                 };
 279
 280                                 processor.asyncRequest( request, callback );
 281
 282                                 // Wait until transaction has started
 283                                 try {
 284                                         // Sleep this thread until transaction has started
 285                                         started.acquire(1);
 286                                 } catch (InterruptedException e) {
 287                                         throw new DatabaseException("Thread was interrupted.");
 288                                 } finally {
 289                                 }
 290                         }
 291                         break;
 292                 }
 293         }
 294
 295         /**
 296          * Commits transaction if no error occurred
 297          *
 298          * @throws DatabaseException
 299          */
 300         public static void endTransaction() throws DatabaseException {
 301                 TransactionInfo t = transactions.get();
 302                 if (t == null) return; //throw new RuntimeDatabaseException("There is no transaction to commit.");
 303
 304                 t.ts.release(9999);
 305
 306                 try {
 307                         t.es.acquire();
 308                 } catch (InterruptedException e) {
 309                         throw new DatabaseException(e);
 310                 }
 311
 312                 if (t.error!=null) {
 313                         if (t.error instanceof CancelTransactionException==false) throw t.error;
 314                 }
 315                 transactions.set(null);
 316         }
 317
 318         /**
 319          * Commits transaction
 320          *
 321          * @throws DatabaseException
 322          */
 323         public static void commit() throws DatabaseException {
 324                 TransactionInfo t = transactions.get();
 325                 if (t == null) throw new RuntimeDatabaseException("There is not transaction to commit.");
 326                 t.commit = true;
 327                 endTransaction();
 328         }
 329
 330     public static String getURI(Resource resource) throws ResourceNotFoundException, ValidationException, ServiceException {
 331         return readGraph().getPossibleURI(resource);
 332     }
 333
 334     public static String getPossibleURI(Resource resource) throws ResourceNotFoundException, ValidationException, ServiceException {
 335         return readGraph().getPossibleURI(resource);
 336     }
 337
 338     public static Resource getResource(String uri) throws ResourceNotFoundException, ValidationException, ServiceException
 339     {
 340         return readGraph().getResource(uri);
 341     }
 342
 343     public static Resource getPossibleResource(String uri) throws ResourceNotFoundException, ValidationException, ServiceException
 344     {
 345         return readGraph().getPossibleResource(uri);
 346     }
 347
 348     public static Resource getBuiltin(String id) throws ResourceNotFoundException, ServiceException
 349     {
 350         return readGraph().getBuiltin(id);
 351     }
 352
 353     public static Collection<Statement> getStatements(Resource subject, Resource relation) throws ManyObjectsForFunctionalRelationException, ServiceException
 354     {
 355         return readGraph().getStatements(subject, relation);
 356     }
 357
 358     public static Collection<Statement> getAssertedStatements(Resource subject, Resource relation) throws ManyObjectsForFunctionalRelationException, ServiceException
 359     {
 360         return readGraph().getAssertedStatements(subject, relation);
 361     }
 362
 363     public static Collection<Resource> getPredicates(Resource subject) throws ServiceException
 364     {
 365         return readGraph().getPredicates(subject);
 366     }
 367
 368     public static Collection<Resource> getPrincipalTypes(Resource subject) throws ServiceException
 369     {
 370         return readGraph().getPrincipalTypes(subject);
 371     }
 372
 373     public static Set<Resource> getTypes(Resource subject) throws ServiceException
 374     {
 375         return readGraph().getTypes(subject);
 376     }
 377
 378     public static Set<Resource> getSupertypes(Resource subject) throws ServiceException
 379     {
 380         return readGraph().getSupertypes(subject);
 381     }
 382
 383     public static Set<Resource> getSuperrelations(Resource subject) throws ServiceException
 384     {
 385         return readGraph().getSuperrelations(subject);
 386     }
 387
 388     public static Collection<Resource> getObjects(Resource subject, Resource relation) throws ManyObjectsForFunctionalRelationException, ServiceException
 389     {
 390         return readGraph().getObjects(subject, relation);
 391     }
 392
 393     public static Collection<Resource> getAssertedObjects(Resource subject, Resource relation) throws ManyObjectsForFunctionalRelationException, ServiceException
 394     {
 395         return readGraph().getAssertedObjects(subject, relation);
 396     }
 397
 398     public static Resource getInverse(Resource relation) throws NoInverseException, ManyObjectsForFunctionalRelationException, ServiceException
 399     {
 400         return readGraph().getInverse(relation);
 401     }
 402
 403     public static Resource getSingleObject(Resource subject, Resource relation) throws NoSingleResultException, ManyObjectsForFunctionalRelationException, ServiceException
 404     {
 405         return readGraph().getSingleObject(subject, relation);
 406     }
 407
 408     public static Statement getSingleStatement(Resource subject, Resource relation) throws NoSingleResultException, ManyObjectsForFunctionalRelationException, ServiceException
 409     {
 410         return readGraph().getSingleStatement(subject, relation);
 411     }
 412
 413     public static Resource getSingleType(Resource subject) throws NoSingleResultException, ServiceException
 414     {
 415         return readGraph().getSingleType(subject);
 416     }
 417
 418     public static Resource getSingleType(Resource subject, Resource baseType) throws NoSingleResultException, ServiceException
 419     {
 420         return readGraph().getSingleType(subject, baseType);
 421     }
 422
 423     public static <T> T getValue(Resource subject) throws DoesNotContainValueException, ServiceException
 424     {
 425         return readGraph().<T>getValue(subject);
 426     }
 427
 428     public static <T> T getValue(Resource subject, Binding binding) throws DoesNotContainValueException, BindingException, ServiceException
 429     {
 430         return readGraph().<T>getValue(subject, binding);
 431     }
 432
 433     public static <T> T getRelatedValue(Resource subject, Resource relation) throws NoSingleResultException, DoesNotContainValueException, ServiceException
 434     {
 435         return readGraph().<T>getRelatedValue(subject, relation);
 436     }
 437
 438     public static <T> T getRelatedValue(Resource subject, Resource relation, Binding binding) throws NoSingleResultException, DoesNotContainValueException, BindingException, ServiceException
 439     {
 440         return readGraph().<T>getRelatedValue(subject, relation, binding);
 441     }
 442
 443     public static <T> T adapt(Resource resource, Class<T> clazz) throws AdaptionException, ValidationException, ServiceException
 444     {
 445         return readGraph().adapt(resource, clazz);
 446     }
 447
 448     public static <T> T adaptUnique(Resource resource, Class<T> clazz) throws AdaptionException, ValidationException, ServiceException
 449     {
 450         return readGraph().adaptUnique(resource, clazz);
 451     }
 452
 453     public static Resource getPossibleInverse(Resource relation) throws ManyObjectsForFunctionalRelationException, ServiceException
 454     {
 455         return readGraph().getPossibleInverse(relation);
 456     }
 457
 458     public static Resource getPossibleObject(Resource subject, Resource relation) throws ManyObjectsForFunctionalRelationException, ServiceException
 459     {
 460         return readGraph().getPossibleObject(subject, relation);
 461     }
 462
 463     public static Statement getPossibleStatement(Resource subject, Resource relation) throws ManyObjectsForFunctionalRelationException, ServiceException
 464     {
 465         return readGraph().getPossibleStatement(subject, relation);
 466     }
 467
 468     public static Resource getPossibleType(Resource subject, Resource baseType) throws ServiceException
 469     {
 470         return readGraph().getPossibleType(subject, baseType);
 471     }
 472
 473     public static <T> T getPossibleValue(Resource subject) throws ServiceException
 474     {
 475         return readGraph().<T>getPossibleValue(subject);
 476     }
 477
 478     public static <T> T getPossibleValue(Resource subject, Binding binding) throws BindingException, ServiceException
 479     {
 480         return readGraph().<T>getPossibleValue(subject, binding);
 481     }
 482
 483     public static <T> T getPossibleRelatedValue(Resource subject, Resource relation) throws ManyObjectsForFunctionalRelationException, ServiceException
 484     {
 485         return readGraph().<T>getPossibleRelatedValue(subject, relation);
 486     }
 487
 488     public static <T> T getPossibleRelatedValue(Resource subject, Resource relation, Binding binding) throws ManyObjectsForFunctionalRelationException, BindingException, ServiceException
 489     {
 490         return readGraph().<T>getPossibleRelatedValue(subject, relation, binding);
 491     }
 492
 493     public static <T> T getPossibleAdapter(Resource resource, Class<T> clazz) throws ValidationException, ServiceException
 494     {
 495         return readGraph().<T>getPossibleAdapter(resource, clazz);
 496     }
 497
 498     public static <T> T getPossibleUniqueAdapter(Resource resource, Class<T> clazz) throws ValidationException, ServiceException
 499     {
 500         return readGraph().<T>getPossibleUniqueAdapter(resource, clazz);
 501     }
 502
 503     public static boolean isInstanceOf(Resource resource, Resource type) throws ServiceException
 504     {
 505         return readGraph().isInstanceOf(resource, type);
 506     }
 507
 508     public static boolean isInheritedFrom(Resource resource, Resource type) throws ServiceException
 509     {
 510         return readGraph().isInheritedFrom(resource, type);
 511     }
 512
 513     public static boolean isSubrelationOf(Resource resource, Resource relation) throws ServiceException
 514     {
 515         return readGraph().isSubrelationOf(resource, relation);
 516     }
 517
 518     public static boolean hasStatement(Resource subject) throws ServiceException
 519     {
 520         return readGraph().hasStatement(subject);
 521     }
 522
 523     public static boolean hasStatement(Resource subject, Resource relation) throws ServiceException
 524     {
 525         return readGraph().hasStatement(subject, relation);
 526     }
 527
 528     public static boolean hasStatement(Resource subject, Resource relation, Resource object) throws ServiceException
 529     {
 530         return readGraph().hasStatement(subject, relation, object);
 531     }
 532
 533     public static boolean hasValue(Resource subject) throws ServiceException
 534     {
 535         return readGraph().hasValue(subject);
 536     }
 537
 538     public static Datatype getDataType(Resource subject) throws DatabaseException
 539     {
 540         return readGraph().getDataType(subject);
 541     }
 542
 543     public static <T extends Accessor> T getAccessor(Resource subject) throws DatabaseException
 544     {
 545         return readGraph().<T>getAccessor(subject);
 546     }
 547
 548
 549     /**
 550      * Makes sure that the statements (s,p,o) and (o,p',s) are found in the
 551      * graph, where p' is the inverse predicate of p. Contrary to
 552      * {@link WriteOnlyGraph#claim(Resource, Resource, Resource, Resource)} this
 553      * method assures that the the statement and its inverse are semantically
 554      * valid after the invocation of this method.
 555      *
 556      * @param subject subject, i.e. source resource of the statement to be
 557      *        claimed
 558      * @param predicate predicate resource of the statement to be claimed
 559      * @param object object, i.e. target resource of the statement to be claimed
 560      * @throws ServiceException
 561      */
 562     public static void claim(Resource subject, Resource predicate, Resource object) throws ServiceException {
 563         writeGraph().claim(subject, predicate, object);
 564     }
 565
 566     /**
 567      * Sets literal value related to the specified resource with the specified
 568      * predicate. If such value exists (s,p), the value is overridden with the
 569      * new specified value.
 570      *
 571      * @param resource
 572      * @param predicate
 573      * @param value Value of the literal (boxed primitive/String or
 574      *        primitive/String array)
 575      * @throws ManyObjectsForFunctionalRelationException
 576      */
 577     public static void claimValue(Resource resource, Resource predicate, Object value)
 578     throws ManyObjectsForFunctionalRelationException, ServiceException, DatabaseException {
 579         writeGraph().claimLiteral(resource, predicate, value);
 580     }
 581     public static void claimValue(Resource resource, Resource predicate, Object value, Binding binding)
 582     throws BindingException, ManyObjectsForFunctionalRelationException, ServiceException, DatabaseException {
 583         writeGraph().claimValue(resource, value, binding);
 584     }
 585     public static void claimValue(Resource resource, Resource predicate, Resource inverse, Resource type, Object value, Binding binding)
 586     throws BindingException, ManyObjectsForFunctionalRelationException, ServiceException, DatabaseException {
 587         writeGraph().claimLiteral(resource, predicate, inverse, type, value, binding);
 588     }
 589
 590     /**
 591      * Makes sure that no statements matching the patterns (s,?p,?o) and
 592      * (?o,?p',s), where ?p' is the inverse predicate of ?p, exist in the graph.
 593      * In other words, removes all statements outgoing from the specified
 594      * resource along with the inverses of those statements.
 595      *
 596      * @param subject
 597      * @throws ServiceException
 598      */
 599     public static void deny(Resource subject) throws ServiceException {
 600         writeGraph().deny(subject);
 601     }
 602
 603     /**
 604      * Makes sure that no statements matching the patterns (s,p,?o) and
 605      * (?o,p',s), where p' is the inverse predicate of p, exist in the graph.
 606      * Also statements where <code>isSubrelationOf(p, predicate)</code> returns
 607      * <code>true</code> shall be removed. In other words, removes all
 608      * statements outgoing from the specified resource with the specified
 609      * predicate or any of its subrelations, along with the inverses of those
 610      * statements.
 611      *
 612      * @param subject
 613      * @throws ServiceException
 614      */
 615     public static void deny(Resource subject, Resource predicate) throws ServiceException {
 616         writeGraph().deny(subject, predicate);
 617     }
 618
 619     /**
 620      * Makes sure that no statements matching the patterns (s,p,o) and (o,p',s),
 621      * where p' is the inverse predicate of p, exist in the graph. Contrary to
 622      * {@link #denyStatement(Resource, Resource, Resource)}, all statements
 623      * where <code>isSubrelationOf(p, predicate)</code> returns
 624      * <code>true</code> shall be removed. In other words, removes all
 625      * statements between the specified subject and object with the specified
 626      * predicate or any of its subrelations, along with the inverses of those
 627      * statements.
 628      *
 629      * @param subject
 630      * @param predicate
 631      * @param object
 632      * @throws ServiceException
 633      */
 634     public static void deny(Resource subject, Resource predicate, Resource object) throws ServiceException {
 635         writeGraph().deny(subject, predicate, object);
 636     }
 637
 638     /**
 639      * Makes sure that no statements matching the patterns (s,p,o) and (o,p',s),
 640      * where p' is the inverse predicate of p, exist in the graph. In other
 641      * words, removes the specified statement and its possible inverse.
 642      *
 643      * <p>
 644      * This method behaves exactly like {@link #deny(Statement)}, it just takes
 645      * the arguments as resources instead of a statement.
 646      *
 647      * @param subject
 648      * @throws ServiceException
 649      *
 650      * @see {@link #deny(Statement)}
 651      */
 652     public static void denyStatement(Resource subject, Resource predicate, Resource object) throws ServiceException {
 653         writeGraph().denyStatement(subject, predicate, object);
 654     }
 655
 656     /**
 657      * Makes sure that the specified statements (s,p,o) and its inverse
 658      * statements (o,p',s), where p' is the inverse predicate of p, do not exist
 659      * in the graph.
 660      *
 661      * <p>
 662      * This method behaves exactly like
 663      * {@link #denyStatement(Resource, Resource, Resource)}, it just takes the
 664      * arguments as a statement instead of 3 resources.
 665      *
 666      * @param statement
 667      *
 668      * @see #denyStatement(Resource, Resource, Resource)
 669      */
 670     public static void deny(Statement statement) throws ServiceException {
 671         writeGraph().deny(statement);
 672     }
 673
 674     /**
 675      * Removes all statements (resource,predicate,?o) and literal contained by
 676      * ?o.
 677      *
 678      * @param resource
 679      * @param predicate
 680      * @throws ManyObjectsForFunctionalRelationException
 681      */
 682     public static void denyValue(Resource resource, Resource predicate) throws ManyObjectsForFunctionalRelationException, ServiceException {
 683         writeGraph().denyValue(resource, predicate);
 684     }
 685
 686 }
 687