public static void readFactHandles(
      MarshallerReaderContext context,
      org.drools.core.marshalling.impl.ProtobufMessages.EntryPoint _ep,
      ObjectStore objectStore,
      List<PropagationContextImpl> pctxs)
      throws IOException, ClassNotFoundException {
    InternalWorkingMemory wm = context.wm;

    SessionEntryPoint entryPoint = context.wm.getEntryPoints().get(_ep.getEntryPointId());
    // load the handles
    for (ProtobufMessages.FactHandle _handle : _ep.getHandleList()) {
      InternalFactHandle handle = readFactHandle(context, entryPoint, _handle);

      context.handles.put(handle.getId(), handle);

      if (!_handle.getIsJustified()) {
        // BeliefSystem handles the Object type
        if (handle.getObject() != null) {
          objectStore.addHandle(handle, handle.getObject());
        }

        // add handle to object type node
        assertHandleIntoOTN(context, wm, handle, pctxs);
      }
    }
  }
    public boolean evaluate(
        InternalWorkingMemory workingMemory,
        final InternalReadAccessor extractor1,
        final InternalFactHandle handle1,
        final InternalReadAccessor extractor2,
        final InternalFactHandle handle2) {
      if (extractor1.isNullValue(workingMemory, handle1.getObject())
          || extractor2.isNullValue(workingMemory, handle2.getObject())) {
        return false;
      }

      long rightTS;
      if (extractor1.isSelfReference()) {
        rightTS = ((EventFactHandle) handle1).getEndTimestamp();
      } else {
        rightTS = extractor1.getLongValue(workingMemory, handle1.getObject());
      }

      long leftTS;
      if (extractor2.isSelfReference()) {
        leftTS = ((EventFactHandle) handle2).getStartTimestamp();
      } else {
        leftTS = extractor2.getLongValue(workingMemory, handle2.getObject());
      }

      return evaluate(rightTS, leftTS);
    }
    public boolean evaluate(
        InternalWorkingMemory workingMemory,
        final InternalReadAccessor extractor1,
        final InternalFactHandle handle1,
        final InternalReadAccessor extractor2,
        final InternalFactHandle handle2) {
      if (extractor1.isNullValue(workingMemory, handle1.getObject())
          || extractor2.isNullValue(workingMemory, handle2.getObject())) {
        return false;
      }

      long rightTS;
      if (extractor1.isSelfReference()) {
        rightTS = ((EventFactHandle) handle1).getEndTimestamp();
      } else {
        rightTS = extractor1.getLongValue(workingMemory, handle1.getObject());
      }

      long leftTS;
      if (extractor2.isSelfReference()) {
        leftTS = ((EventFactHandle) handle2).getStartTimestamp();
      } else {
        leftTS = extractor2.getLongValue(workingMemory, handle2.getObject());
      }

      long dist = leftTS - rightTS;

      return this.getOperator().isNegated() ^ (dist >= this.initRange && dist <= this.finalRange);
    }
    public boolean evaluate(
        InternalWorkingMemory workingMemory,
        final InternalReadAccessor extractor1,
        final InternalFactHandle handl1,
        final InternalReadAccessor extractor2,
        final InternalFactHandle handl2) {
      final Object value1 = extractor1.getValue(workingMemory, handl1.getObject());
      final Object value2 = extractor2.getValue(workingMemory, handl2.getObject());

      return !soundslike((String) value1, (String) value2);
    }
    public void execute(InternalWorkingMemory workingMemory) {
      DroolsQuery query = (DroolsQuery) factHandle.getObject();
      RightTupleList rightTuples = query.getResultInsertRightTupleList();
      query.setResultInsertRightTupleList(
          null); // null so further operations happen on a new stack element

      for (RightTuple rightTuple = rightTuples.getFirst(); rightTuple != null; ) {
        RightTuple tmp = (RightTuple) rightTuple.getNext();
        rightTuples.remove(rightTuple);
        for (LeftTuple childLeftTuple = rightTuple.firstChild;
            childLeftTuple != null;
            childLeftTuple = (LeftTuple) childLeftTuple.getRightParentNext()) {
          node.getSinkPropagator()
              .doPropagateAssertLeftTuple(
                  context, workingMemory, childLeftTuple, childLeftTuple.getLeftTupleSink());
        }
        rightTuple = tmp;
      }

      // @FIXME, this should work, but it's closing needed fact handles
      // actually an evaluation 34 appears on the stack twice....
      //            if ( !node.isOpenQuery() ) {
      //                workingMemory.getFactHandleFactory().destroyFactHandle( this.factHandle );
      //            }
    }
  private static void assertHandleIntoOTN(
      MarshallerReaderContext context,
      InternalWorkingMemory wm,
      InternalFactHandle handle,
      List<PropagationContextImpl> pctxs) {
    Object object = handle.getObject();
    InternalWorkingMemoryEntryPoint ep = (InternalWorkingMemoryEntryPoint) handle.getEntryPoint();
    ObjectTypeConf typeConf =
        ((InternalWorkingMemoryEntryPoint) handle.getEntryPoint())
            .getObjectTypeConfigurationRegistry()
            .getObjectTypeConf(ep.getEntryPoint(), object);
    PropagationContextImpl propagationContext =
        new PropagationContextImpl(
            wm.getNextPropagationIdCounter(),
            PropagationContext.INSERTION,
            null,
            null,
            handle,
            ep.getEntryPoint(),
            context);
    // keeping this list for a later cleanup is necessary because of the lazy propagations that
    // might occur
    pctxs.add(propagationContext);

    ep.getEntryPointNode().assertObject(handle, propagationContext, typeConf, wm);

    propagationContext.evaluateActionQueue(wm);
    wm.executeQueuedActions();
  }
  public static void readTruthMaintenanceSystem(
      MarshallerReaderContext context,
      SessionEntryPoint wmep,
      ProtobufMessages.EntryPoint _ep,
      List<PropagationContextImpl> pctxs)
      throws IOException, ClassNotFoundException {
    TruthMaintenanceSystem tms = ((NamedEntryPoint) wmep).getTruthMaintenanceSystem();

    ProtobufMessages.TruthMaintenanceSystem _tms = _ep.getTms();

    for (ProtobufMessages.EqualityKey _key : _tms.getKeyList()) {
      InternalFactHandle handle = (InternalFactHandle) context.handles.get(_key.getHandleId());

      // ObjectTypeConf state is not marshalled, so it needs to be re-determined
      ObjectTypeConf typeConf =
          context
              .wm
              .getObjectTypeConfigurationRegistry()
              .getObjectTypeConf(
                  ((NamedEntryPoint) handle.getEntryPoint()).getEntryPoint(), handle.getObject());
      if (!typeConf.isTMSEnabled()) {
        typeConf.enableTMS();
      }

      EqualityKey key = new EqualityKey(handle, _key.getStatus());
      handle.setEqualityKey(key);

      if (key.getStatus() == EqualityKey.JUSTIFIED) {
        // not yet added to the object stores
        ((NamedEntryPoint) handle.getEntryPoint())
            .getObjectStore()
            .addHandle(handle, handle.getObject());
        // add handle to object type node
        assertHandleIntoOTN(context, context.wm, handle, pctxs);
      }

      for (Integer factHandleId : _key.getOtherHandleList()) {
        handle = (InternalFactHandle) context.handles.get(factHandleId.intValue());
        key.addFactHandle(handle);
        handle.setEqualityKey(key);
      }
      tms.put(key);

      readBeliefSet(context, tms, key, _key.getBeliefSet());
    }
  }
    public boolean evaluateCachedLeft(
        InternalWorkingMemory workingMemory,
        final VariableContextEntry context,
        final InternalFactHandle right) {
      if (context.leftNull || context.extractor.isNullValue(workingMemory, right.getObject())) {
        return false;
      }

      long leftTS = ((LeftStartRightEndContextEntry) context).timestamp;
      long rightTS;
      if (context.getFieldExtractor().isSelfReference()) {
        rightTS = ((EventFactHandle) right).getEndTimestamp();
      } else {
        rightTS = context.getFieldExtractor().getLongValue(workingMemory, right.getObject());
      }
      return evaluate(rightTS, leftTS);
    }
    public boolean evaluateCachedLeft(
        InternalWorkingMemory workingMemory,
        final VariableContextEntry context,
        final InternalFactHandle right) {
      final String value = (String) context.extractor.getValue(workingMemory, right.getObject());

      return !soundslike(value, (String) ((ObjectVariableContextEntry) context).left);
    }
    public boolean evaluateCachedLeft(
        InternalWorkingMemory workingMemory,
        final VariableContextEntry context,
        final InternalFactHandle right) {
      if (context.leftNull || context.extractor.isNullValue(workingMemory, right.getObject())) {
        return false;
      }

      long leftTS = ((LeftStartRightEndContextEntry) context).timestamp;
      long rightTS;
      if (context.getFieldExtractor().isSelfReference()) {
        rightTS = ((EventFactHandle) right).getEndTimestamp();
      } else {
        rightTS = context.getFieldExtractor().getLongValue(workingMemory, right.getObject());
      }
      long dist = leftTS - rightTS;
      return this.getOperator().isNegated() ^ (dist >= this.initRange && dist <= this.finalRange);
    }
    public boolean evaluateCachedRight(
        InternalWorkingMemory workingMemory,
        final VariableContextEntry context,
        final InternalFactHandle left) {
      final String value = (String) ((ObjectVariableContextEntry) context).right;

      return !soundslike(
          value,
          (String) context.declaration.getExtractor().getValue(workingMemory, left.getObject()));
    }
 private static ProtobufMessages.FactHandle.HandleType getHandleType(InternalFactHandle handle) {
   if (handle instanceof EventFactHandle) {
     return ProtobufMessages.FactHandle.HandleType.EVENT;
   } else if (handle instanceof QueryElementFactHandle) {
     return ProtobufMessages.FactHandle.HandleType.QUERY;
   } else if (handle.getObject() instanceof InitialFact) {
     return ProtobufMessages.FactHandle.HandleType.INITIAL_FACT;
   }
   return ProtobufMessages.FactHandle.HandleType.FACT;
 }
    public boolean evaluate(
        InternalWorkingMemory workingMemory,
        final InternalReadAccessor extractor,
        final InternalFactHandle handle1,
        final FieldValue object2) {
      final String value1 = (String) extractor.getValue(workingMemory, handle1.getObject());
      final String value2 = (String) object2.getValue();

      return !soundslike(value1, value2);
    }
Beispiel #14
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    @Override
    public Iterator getResults(
        Tuple leftTuple, InternalWorkingMemory wm, PropagationContext ctx, Object providerContext) {
      InternalFactHandle fh = leftTuple.getFactHandle();
      Object obj = fh.getObject();

      if (obj instanceof DroolsQuery) {
        obj = ((DroolsQuery) obj).getElements()[declaration.getPattern().getOffset()];
      }

      return xpathEvaluator.evaluate(wm, leftTuple, obj).iterator();
    }
Beispiel #15
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 /**
  * This is the entry point into the network for all asserted Facts. Iterates a cache of matching
  * <code>ObjectTypdeNode</code>s asserting the Fact. If the cache does not exist it first iteraes
  * and builds the cache.
  *
  * @param factHandle The FactHandle of the fact to assert
  * @param context The <code>PropagationContext</code> of the <code>WorkingMemory</code> action
  * @param workingMemory The working memory session.
  */
 public void assertObject(
     final InternalFactHandle factHandle,
     final PropagationContext context,
     final InternalWorkingMemory workingMemory) {
   EntryPointId entryPoint = context.getEntryPoint();
   EntryPointNode node = this.entryPoints.get(entryPoint);
   ObjectTypeConf typeConf =
       ((InternalWorkingMemoryEntryPoint)
               workingMemory.getWorkingMemoryEntryPoint(entryPoint.getEntryPointId()))
           .getObjectTypeConfigurationRegistry()
           .getObjectTypeConf(entryPoint, factHandle.getObject());
   node.assertObject(factHandle, context, typeConf, workingMemory);
 }
    public void execute(InternalWorkingMemory workingMemory) {
      DroolsQuery query = (DroolsQuery) factHandle.getObject();
      RightTupleList rightTuples = query.getResultRetractRightTupleList();
      query.setResultRetractRightTupleList(
          null); // null so further operations happen on a new stack element

      for (RightTuple rightTuple = rightTuples.getFirst(); rightTuple != null; ) {
        RightTuple tmp = (RightTuple) rightTuple.getNext();
        rightTuples.remove(rightTuple);
        this.node
            .getSinkPropagator()
            .propagateRetractRightTuple(rightTuple, context, workingMemory);
        rightTuple = tmp;
      }
    }
  public void byPassModifyToBetaNode(
      final InternalFactHandle factHandle,
      final ModifyPreviousTuples modifyPreviousTuples,
      final PropagationContext context,
      final InternalWorkingMemory workingMemory) {
    final Object object = factHandle.getObject();

    // We need to iterate in the same order as the assert
    if (this.hashedFieldIndexes != null) {
      // Iterate the FieldIndexes to see if any are hashed
      for (FieldIndex fieldIndex = this.hashedFieldIndexes.getFirst();
          fieldIndex != null;
          fieldIndex = fieldIndex.getNext()) {
        if (!fieldIndex.isHashed()) {
          continue;
        }
        // this field is hashed so set the existing hashKey and see if there is a sink for it
        final AlphaNode sink = (AlphaNode) this.hashedSinkMap.get(new HashKey(fieldIndex, object));
        if (sink != null) {
          // only alpha nodes are hashable
          sink.getObjectSinkPropagator()
              .byPassModifyToBetaNode(factHandle, modifyPreviousTuples, context, workingMemory);
        }
      }
    }

    // propagate unhashed
    if (this.hashableSinks != null) {
      for (ObjectSinkNode sink = this.hashableSinks.getFirst();
          sink != null;
          sink = sink.getNextObjectSinkNode()) {
        // only alpha nodes are hashable
        ((AlphaNode) sink)
            .getObjectSinkPropagator()
            .byPassModifyToBetaNode(factHandle, modifyPreviousTuples, context, workingMemory);
      }
    }

    if (this.otherSinks != null) {
      // propagate others
      for (ObjectSinkNode sink = this.otherSinks.getFirst();
          sink != null;
          sink = sink.getNextObjectSinkNode()) {
        // compound alpha, lianode or betanode
        sink.byPassModifyToBetaNode(factHandle, modifyPreviousTuples, context, workingMemory);
      }
    }
  }
    public boolean evaluate(
        InternalWorkingMemory workingMemory,
        final InternalReadAccessor extractor,
        final InternalFactHandle object1,
        final FieldValue object2) {
      long rightTS;
      if (extractor.isSelfReference()) {
        rightTS = ((EventFactHandle) object1).getStartTimestamp();
      } else {
        rightTS = extractor.getLongValue(workingMemory, object1.getObject());
      }

      long leftTS = ((Date) object2.getValue()).getTime();

      return evaluate(rightTS, leftTS);
    }
  public void propagateModifyObject(
      final InternalFactHandle factHandle,
      final ModifyPreviousTuples modifyPreviousTuples,
      final PropagationContext context,
      final InternalWorkingMemory workingMemory) {
    final Object object = factHandle.getObject();

    // Iterates the FieldIndex collection, which tells you if particularly field is hashed or not
    // if the field is hashed then it builds the hashkey to return the correct sink for the current
    // objects slot's
    // value, one object may have multiple fields indexed.
    if (this.hashedFieldIndexes != null) {
      // Iterate the FieldIndexes to see if any are hashed
      for (FieldIndex fieldIndex = this.hashedFieldIndexes.getFirst();
          fieldIndex != null;
          fieldIndex = fieldIndex.getNext()) {
        if (!fieldIndex.isHashed()) {
          continue;
        }
        // this field is hashed so set the existing hashKey and see if there is a sink for it
        final AlphaNode sink = (AlphaNode) this.hashedSinkMap.get(new HashKey(fieldIndex, object));
        if (sink != null) {
          // go straight to the AlphaNode's propagator, as we know it's true and no need to retest
          sink.getObjectSinkPropagator()
              .propagateModifyObject(factHandle, modifyPreviousTuples, context, workingMemory);
        }
      }
    }

    // propagate unhashed
    if (this.hashableSinks != null) {
      for (ObjectSinkNode sink = this.hashableSinks.getFirst();
          sink != null;
          sink = sink.getNextObjectSinkNode()) {
        doPropagateModifyObject(factHandle, modifyPreviousTuples, context, workingMemory, sink);
      }
    }

    if (this.otherSinks != null) {
      // propagate others
      for (ObjectSinkNode sink = this.otherSinks.getFirst();
          sink != null;
          sink = sink.getNextObjectSinkNode()) {
        doPropagateModifyObject(factHandle, modifyPreviousTuples, context, workingMemory, sink);
      }
    }
  }
  private static ProtobufMessages.FactHandle writeFactHandle(
      MarshallerWriteContext context,
      ObjectMarshallingStrategyStore objectMarshallingStrategyStore,
      InternalFactHandle handle)
      throws IOException {
    ProtobufMessages.FactHandle.Builder _handle = ProtobufMessages.FactHandle.newBuilder();

    _handle.setType(getHandleType(handle));
    _handle.setId(handle.getId());
    _handle.setRecency(handle.getRecency());

    if (_handle.getType() == ProtobufMessages.FactHandle.HandleType.EVENT) {
      // is event
      EventFactHandle efh = (EventFactHandle) handle;
      _handle.setTimestamp(efh.getStartTimestamp());
      _handle.setDuration(efh.getDuration());
      _handle.setIsExpired(efh.isExpired());
      _handle.setActivationsCount(efh.getActivationsCount());
    }

    if (handle.getEqualityKey() != null
        && handle.getEqualityKey().getStatus() == EqualityKey.JUSTIFIED) {
      _handle.setIsJustified(true);
    } else {
      _handle.setIsJustified(false);
    }

    Object object = handle.getObject();

    if (object != null) {
      ObjectMarshallingStrategy strategy = objectMarshallingStrategyStore.getStrategyObject(object);

      Integer index = context.getStrategyIndex(strategy);
      _handle.setStrategyIndex(index.intValue());
      _handle.setObject(
          ByteString.copyFrom(
              strategy.marshal(context.strategyContext.get(strategy), context, object)));
    }

    return _handle.build();
  }
 public void execute(InternalWorkingMemory workingMemory) {
   InternalFactHandle factHandle = (InternalFactHandle) leftTuple.getObject();
   if (node.isOpenQuery()) {
     // iterate to the query terminal node, as the child leftTuples will get picked up there
     workingMemory
         .getEntryPointNode()
         .retractObject(
             factHandle,
             context,
             workingMemory
                 .getObjectTypeConfigurationRegistry()
                 .getObjectTypeConf(workingMemory.getEntryPoint(), factHandle.getObject()),
             workingMemory);
     // workingMemory.getFactHandleFactory().destroyFactHandle( factHandle );
   } else {
     // get child left tuples, as there is no open query
     if (leftTuple.getFirstChild() != null) {
       node.getSinkPropagator().propagateRetractLeftTuple(leftTuple, context, workingMemory);
     }
   }
 }
Beispiel #22
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  public void assertObject(
      final InternalFactHandle handle,
      final PropagationContext context,
      final ObjectTypeConf objectTypeConf,
      final InternalWorkingMemory workingMemory) {
    if (log.isTraceEnabled()) {
      log.trace("Insert {}", handle.toString());
    }

    // checks if shadow is enabled
    if (objectTypeConf.isShadowEnabled()) {
      // the user has implemented the ShadowProxy interface, let their implementation
      // know it is safe to update the information the engine can see.
      ((ShadowProxy) handle.getObject()).updateProxy();
    }

    ObjectTypeNode[] cachedNodes = objectTypeConf.getObjectTypeNodes();

    for (int i = 0, length = cachedNodes.length; i < length; i++) {
      cachedNodes[i].assertObject(handle, context, workingMemory);
    }
  }
Beispiel #23
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  @Test
  public void testRestract() {
    final PropagationContext context =
        pctxFactory.createPropagationContext(0, PropagationContext.INSERTION, null, null, null);
    final StatefulKnowledgeSessionImpl workingMemory =
        new StatefulKnowledgeSessionImpl(
            1L, (InternalKnowledgeBase) KnowledgeBaseFactory.newKnowledgeBase());
    final ClassFieldReader extractor = store.getReader(Cheese.class, "type");

    final MvelConstraint constraint =
        new MvelConstraintTestUtil(
            "type == \"stilton\"", FieldFactory.getInstance().getFieldValue("stilton"), extractor);

    final List list = new ArrayList();
    final Cheese cheese1 = new Cheese("stilton", 5);
    final Cheese cheese2 = new Cheese("stilton", 15);
    list.add(cheese1);
    list.add(cheese2);
    final MockDataProvider dataProvider = new MockDataProvider(list);

    final Pattern pattern = new Pattern(0, new ClassObjectType(Cheese.class));

    From fromCe = new From(dataProvider);
    fromCe.setResultPattern(pattern);

    final ReteFromNode from =
        new ReteFromNode(
            3,
            dataProvider,
            new MockTupleSource(30),
            new AlphaNodeFieldConstraint[] {constraint},
            null,
            true,
            buildContext,
            fromCe);
    final MockLeftTupleSink sink = new MockLeftTupleSink(5);
    from.addTupleSink(sink);

    final List asserted = sink.getAsserted();

    final Person person1 = new Person("xxx2", 30);
    final FactHandle person1Handle = workingMemory.insert(person1);
    final LeftTuple tuple = new LeftTupleImpl((DefaultFactHandle) person1Handle, from, true);
    from.assertLeftTuple(tuple, context, workingMemory);

    assertEquals(2, asserted.size());

    final FromMemory memory = (FromMemory) workingMemory.getNodeMemory(from);
    assertEquals(1, memory.getBetaMemory().getLeftTupleMemory().size());
    assertNull(memory.getBetaMemory().getRightTupleMemory());
    RightTuple rightTuple2 = tuple.getFirstChild().getRightParent();
    RightTuple rightTuple1 = tuple.getFirstChild().getHandleNext().getRightParent();
    assertFalse(rightTuple1.equals(rightTuple2));
    assertNull(tuple.getFirstChild().getHandleNext().getHandleNext());

    final InternalFactHandle handle2 = rightTuple2.getFactHandle();
    final InternalFactHandle handle1 = rightTuple1.getFactHandle();
    assertEquals(handle1.getObject(), cheese2);
    assertEquals(handle2.getObject(), cheese1);

    from.retractLeftTuple(tuple, context, workingMemory);
    assertEquals(0, memory.getBetaMemory().getLeftTupleMemory().size());
    assertNull(memory.getBetaMemory().getRightTupleMemory());
  }
  private static void readBeliefSet(
      MarshallerReaderContext context,
      TruthMaintenanceSystem tms,
      EqualityKey key,
      ProtobufMessages.BeliefSet _beliefSet)
      throws IOException, ClassNotFoundException {
    InternalFactHandle handle = (InternalFactHandle) context.handles.get(_beliefSet.getHandleId());
    for (ProtobufMessages.LogicalDependency _logicalDependency :
        _beliefSet.getLogicalDependencyList()) {
      ProtobufMessages.Activation _activation = _logicalDependency.getActivation();
      Activation activation =
          (Activation)
              context
                  .filter
                  .getTuplesCache()
                  .get(
                      PersisterHelper.createActivationKey(
                          _activation.getPackageName(),
                          _activation.getRuleName(),
                          _activation.getTuple()))
                  .getObject();

      Object object = null;
      ObjectMarshallingStrategy strategy = null;
      if (_logicalDependency.hasObjectStrategyIndex()) {
        strategy = context.usedStrategies.get(_logicalDependency.getObjectStrategyIndex());
        object =
            strategy.unmarshal(
                context.strategyContexts.get(strategy),
                context,
                _logicalDependency.getObject().toByteArray(),
                (context.ruleBase == null) ? null : context.ruleBase.getRootClassLoader());
      }

      Object value = null;
      if (_logicalDependency.hasValueStrategyIndex()) {
        strategy = context.usedStrategies.get(_logicalDependency.getValueStrategyIndex());
        value =
            strategy.unmarshal(
                context.strategyContexts.get(strategy),
                context,
                _logicalDependency.getValue().toByteArray(),
                (context.ruleBase == null) ? null : context.ruleBase.getRootClassLoader());
      }

      ObjectTypeConf typeConf =
          context
              .wm
              .getObjectTypeConfigurationRegistry()
              .getObjectTypeConf(
                  ((NamedEntryPoint) handle.getEntryPoint()).getEntryPoint(), handle.getObject());
      tms.readLogicalDependency(
          handle,
          object,
          value,
          activation,
          activation.getPropagationContext(),
          activation.getRule(),
          typeConf);
    }
  }
Beispiel #25
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  public void modifyObject(
      final InternalFactHandle handle,
      final PropagationContext context,
      final ObjectTypeConf objectTypeConf,
      final InternalWorkingMemory wm) {
    if (log.isTraceEnabled()) {
      log.trace("Update {}", handle.toString());
    }

    // checks if shadow is enabled
    if (objectTypeConf.isShadowEnabled()) {
      // the user has implemented the ShadowProxy interface, let their implementation
      // know it is safe to update the information the engine can see.
      ((ShadowProxy) handle.getObject()).updateProxy();
    }

    ObjectTypeNode[] cachedNodes = objectTypeConf.getObjectTypeNodes();

    // make a reference to the previous tuples, then null then on the handle
    ModifyPreviousTuples modifyPreviousTuples =
        new ModifyPreviousTuples(
            handle.getFirstLeftTuple(), handle.getFirstRightTuple(), unlinkingEnabled);
    handle.clearLeftTuples();
    handle.clearRightTuples();

    for (int i = 0, length = cachedNodes.length; i < length; i++) {
      cachedNodes[i].modifyObject(handle, modifyPreviousTuples, context, wm);

      // remove any right tuples that matches the current OTN before continue the modify on the next
      // OTN cache entry
      if (i < cachedNodes.length - 1) {
        RightTuple rightTuple = modifyPreviousTuples.peekRightTuple();
        while (rightTuple != null
            && ((BetaNode) rightTuple.getRightTupleSink()).getObjectTypeNode() == cachedNodes[i]) {
          modifyPreviousTuples.removeRightTuple();

          if (unlinkingEnabled) {
            BetaMemory bm = BetaNode.getBetaMemory((BetaNode) rightTuple.getRightTupleSink(), wm);
            BetaNode.doDeleteRightTuple(rightTuple, wm, bm);
          } else {
            ((BetaNode) rightTuple.getRightTupleSink()).retractRightTuple(rightTuple, context, wm);
          }

          rightTuple = modifyPreviousTuples.peekRightTuple();
        }

        LeftTuple leftTuple;
        ObjectTypeNode otn;
        while (true) {
          leftTuple = modifyPreviousTuples.peekLeftTuple();
          otn = null;
          if (leftTuple != null) {
            LeftTupleSink leftTupleSink = leftTuple.getLeftTupleSink();
            if (leftTupleSink instanceof LeftTupleSource) {
              otn = ((LeftTupleSource) leftTupleSink).getLeftTupleSource().getObjectTypeNode();
            } else if (leftTupleSink instanceof RuleTerminalNode) {
              otn = ((RuleTerminalNode) leftTupleSink).getObjectTypeNode();
            }
          }

          if (otn == null || otn == cachedNodes[i + 1]) break;

          modifyPreviousTuples.removeLeftTuple();

          if (unlinkingEnabled) {
            LeftInputAdapterNode liaNode =
                (LeftInputAdapterNode) leftTuple.getLeftTupleSink().getLeftTupleSource();
            LiaNodeMemory lm = (LiaNodeMemory) wm.getNodeMemory(liaNode);
            LeftInputAdapterNode.doDeleteObject(
                leftTuple, context, lm.getSegmentMemory(), wm, liaNode, true, lm);
          } else {
            leftTuple.getLeftTupleSink().retractLeftTuple(leftTuple, context, wm);
          }
        }
      }
    }
    modifyPreviousTuples.retractTuples(context, wm);
  }