public int evaluateNetwork(PathMemory pmem, InternalWorkingMemory wm, RuleExecutor executor) {
    SegmentMemory[] smems = pmem.getSegmentMemories();

    int smemIndex = 0;
    SegmentMemory smem = smems[smemIndex]; // 0
    LeftInputAdapterNode liaNode = (LeftInputAdapterNode) smem.getRootNode();

    NetworkNode node;
    Memory nodeMem;
    if (liaNode == smem.getTipNode()) {
      // segment only has liaNode in it
      // nothing is staged in the liaNode, so skip to next segment
      smem = smems[++smemIndex]; // 1
      node = smem.getRootNode();
      nodeMem = smem.getNodeMemories().getFirst();
    } else {
      // lia is in shared segment, so point to next node
      node = liaNode.getSinkPropagator().getFirstLeftTupleSink();
      nodeMem = smem.getNodeMemories().getFirst().getNext(); // skip the liaNode memory
    }

    LeftTupleSets srcTuples = smem.getStagedLeftTuples();

    if (log.isTraceEnabled()) {
      log.trace(
          "Rule[name={}] segments={} {}",
          ((TerminalNode) pmem.getNetworkNode()).getRule().getName(),
          smems.length,
          srcTuples.toStringSizes());
    }

    Set<String> visitedRules;
    if (((TerminalNode) pmem.getNetworkNode()).getType() == NodeTypeEnums.QueryTerminalNode) {
      visitedRules = new HashSet<String>();
    } else {
      visitedRules = Collections.<String>emptySet();
    }

    LinkedList<StackEntry> stack = new LinkedList<StackEntry>();
    eval1(
        liaNode,
        pmem,
        (LeftTupleSink) node,
        nodeMem,
        smems,
        smemIndex,
        srcTuples,
        wm,
        stack,
        visitedRules,
        true,
        executor);

    return 0;
  }
Beispiel #2
0
  @Test
  public void testPopulatedSharedLiaNode() throws Exception {
    KnowledgeBase kbase1 = buildKnowledgeBase("r1", "   A() B(1;) C() D() E()\n");
    InternalWorkingMemory wm = ((InternalWorkingMemory) kbase1.newStatefulKnowledgeSession());
    List list = new ArrayList();
    wm.setGlobal("list", list);

    wm.insert(new A(1));
    wm.insert(new A(2));
    wm.insert(new A(3));
    wm.insert(new B(1));
    wm.insert(new B(2));
    wm.insert(new C(1));
    wm.insert(new D(1));
    wm.insert(new E(1));

    wm.fireAllRules();
    assertEquals(3, list.size());

    kbase1.addKnowledgePackages(buildKnowledgePackage("r2", "   a : A() B(2;) C() D() E()\n"));

    ObjectTypeNode aotn = getObjectTypeNode(kbase1, A.class);
    LeftInputAdapterNode liaNode = (LeftInputAdapterNode) aotn.getSinkPropagator().getSinks()[0];
    JoinNode bNode1 = (JoinNode) liaNode.getSinkPropagator().getFirstLeftTupleSink();
    JoinNode bNode2 = (JoinNode) liaNode.getSinkPropagator().getLastLeftTupleSink();

    BetaMemory bm = (BetaMemory) wm.getNodeMemory(bNode2);
    SegmentMemory sm = bm.getSegmentMemory();
    assertNotNull(sm.getStagedLeftTuples().getInsertFirst());
    assertNotNull(sm.getStagedLeftTuples().getInsertFirst().getStagedNext());
    assertNotNull(sm.getStagedLeftTuples().getInsertFirst().getStagedNext().getStagedNext());
    assertNull(
        sm.getStagedLeftTuples().getInsertFirst().getStagedNext().getStagedNext().getStagedNext());

    wm.fireAllRules();
    assertNull(sm.getStagedLeftTuples().getInsertFirst());
    assertEquals(6, list.size());

    assertEquals("r1", ((Match) list.get(0)).getRule().getName());
    assertEquals("r1", ((Match) list.get(1)).getRule().getName());
    assertEquals("r1", ((Match) list.get(2)).getRule().getName());
    assertEquals("r2", ((Match) list.get(3)).getRule().getName());
    assertEquals("r2", ((Match) list.get(4)).getRule().getName());
    assertEquals("r2", ((Match) list.get(5)).getRule().getName());

    List results = new ArrayList();
    results.add(((A) ((Match) list.get(3)).getDeclarationValue("a")).getObject());
    results.add(((A) ((Match) list.get(4)).getDeclarationValue("a")).getObject());
    results.add(((A) ((Match) list.get(5)).getDeclarationValue("a")).getObject());
    assertTrue(results.containsAll(asList(1, 2, 3)));
  }
  @Test
  public void testModifyWithLiaToFrom() {
    // technically you can't have a modify with InitialFactImpl
    // But added test for completeness

    String str = "";
    str += "package org.simple \n";
    str += "import " + Person.class.getCanonicalName() + "\n";
    str += "import " + Cheese.class.getCanonicalName() + "\n";
    str += "import " + Cat.class.getCanonicalName() + "\n";
    str += "global java.util.List list \n";
    str += "rule x1 \n";
    str += "when \n";
    str += "    $pe : Person() from list\n";
    str += "then \n";
    str += "end  \n";
    str += "rule x2 \n";
    str += "when \n";
    str += "    $ch : Cheese() from list\n";
    str += "then \n";
    str += "end  \n";
    str += "rule x3 \n";
    str += "when \n";
    str += "    $ch : Cheese() from list\n";
    str += "then \n";
    str += "end  \n";
    str += "rule x4 \n";
    str += "when \n";
    str += "    $ch : Cheese() from list\n";
    str += "    eval( $ch != null ) \n";
    str += "then \n";
    str += "end  \n";

    KnowledgeBase kbase = loadKnowledgeBaseFromString(str);

    ReteooWorkingMemoryInterface wm =
        ((StatefulKnowledgeSessionImpl) kbase.newStatefulKnowledgeSession()).session;
    wm.fireAllRules();

    ObjectTypeNode otnInit = getObjectTypeNode(kbase, "InitialFactImpl");

    LeftInputAdapterNode liaNode = (LeftInputAdapterNode) otnInit.getSinkPropagator().getSinks()[0];

    LeftTupleSink[] sinks = liaNode.getSinkPropagator().getSinks();

    assertEquals(0, sinks[0].getLeftInputOtnId().getId());
    assertEquals(1, sinks[1].getLeftInputOtnId().getId());
    assertEquals(2, sinks[2].getLeftInputOtnId().getId());
    assertEquals(3, sinks[3].getLeftInputOtnId().getId());
  }
  public void evaluateNetwork(PathMemory pmem, RuleExecutor executor, InternalWorkingMemory wm) {
    SegmentMemory[] smems = pmem.getSegmentMemories();

    int smemIndex = 0;
    SegmentMemory smem = smems[smemIndex]; // 0
    LeftInputAdapterNode liaNode = (LeftInputAdapterNode) smem.getRootNode();

    LinkedList<StackEntry> stack = new LinkedList<StackEntry>();

    NetworkNode node;
    Memory nodeMem;
    long bit = 1;
    if (liaNode == smem.getTipNode()) {
      // segment only has liaNode in it
      // nothing is staged in the liaNode, so skip to next segment
      smem = smems[++smemIndex]; // 1
      node = smem.getRootNode();
      nodeMem = smem.getNodeMemories().getFirst();
    } else {
      // lia is in shared segment, so point to next node
      bit = 2;
      node = liaNode.getSinkPropagator().getFirstLeftTupleSink();
      nodeMem = smem.getNodeMemories().getFirst().getNext(); // skip the liaNode memory
    }

    TupleSets<LeftTuple> srcTuples = smem.getStagedLeftTuples();
    if (log.isTraceEnabled()) {
      log.trace(
          "Rule[name={}] segments={} {}",
          ((TerminalNode) pmem.getNetworkNode()).getRule().getName(),
          smems.length,
          srcTuples.toStringSizes());
    }
    outerEval(
        liaNode, pmem, node, bit, nodeMem, smems, smemIndex, srcTuples, wm, stack, true, executor);
  }
Beispiel #5
0
  @Test
  public void testPopulatedRuleWithEvals() throws Exception {
    KnowledgeBase kbase1 = buildKnowledgeBase("r1", "   a:A() B() eval(1==1) eval(1==1) C(1;) \n");
    InternalWorkingMemory wm = ((InternalWorkingMemory) kbase1.newStatefulKnowledgeSession());
    List list = new ArrayList();
    wm.setGlobal("list", list);

    wm.insert(new A(1));
    wm.insert(new A(2));
    wm.insert(new A(3));
    wm.insert(new B(1));
    wm.insert(new C(1));
    wm.insert(new C(2));

    wm.fireAllRules();
    assertEquals(3, list.size());

    kbase1.addKnowledgePackages(
        buildKnowledgePackage("r2", "   a:A() B() eval(1==1) eval(1==1) C(2;) \n"));

    ObjectTypeNode aotn = getObjectTypeNode(kbase1, A.class);
    LeftInputAdapterNode liaNode = (LeftInputAdapterNode) aotn.getSinkPropagator().getSinks()[0];
    JoinNode bNode = (JoinNode) liaNode.getSinkPropagator().getFirstLeftTupleSink();

    EvalConditionNode e1 = (EvalConditionNode) bNode.getSinkPropagator().getFirstLeftTupleSink();
    EvalConditionNode e2 = (EvalConditionNode) e1.getSinkPropagator().getFirstLeftTupleSink();

    JoinNode c1Node = (JoinNode) e2.getSinkPropagator().getFirstLeftTupleSink();
    JoinNode c2Node = (JoinNode) e2.getSinkPropagator().getLastLeftTupleSink();

    LiaNodeMemory lm = (LiaNodeMemory) wm.getNodeMemory(liaNode);
    SegmentMemory sm = lm.getSegmentMemory();

    BetaMemory c1Mem = (BetaMemory) wm.getNodeMemory(c1Node);
    assertSame(sm.getFirst(), c1Mem.getSegmentMemory());
    assertEquals(3, c1Mem.getLeftTupleMemory().size());
    assertEquals(1, c1Mem.getRightTupleMemory().size());

    BetaMemory c2Mem = (BetaMemory) wm.getNodeMemory(c2Node);
    SegmentMemory c2Smem = sm.getFirst().getNext();
    assertSame(c2Smem, c2Mem.getSegmentMemory());
    assertEquals(0, c2Mem.getLeftTupleMemory().size());
    assertEquals(0, c2Mem.getRightTupleMemory().size());
    assertNotNull(c2Smem.getStagedLeftTuples().getInsertFirst());
    assertNotNull(c2Smem.getStagedLeftTuples().getInsertFirst().getStagedNext());
    assertNotNull(c2Smem.getStagedLeftTuples().getInsertFirst().getStagedNext().getStagedNext());
    assertNull(
        c2Smem
            .getStagedLeftTuples()
            .getInsertFirst()
            .getStagedNext()
            .getStagedNext()
            .getStagedNext());

    wm.fireAllRules();
    assertEquals(3, c2Mem.getLeftTupleMemory().size());
    assertEquals(1, c2Mem.getRightTupleMemory().size());
    assertNull(c2Smem.getStagedLeftTuples().getInsertFirst());
    assertEquals(6, list.size());

    assertEquals("r1", ((Match) list.get(0)).getRule().getName());
    assertEquals("r1", ((Match) list.get(1)).getRule().getName());
    assertEquals("r1", ((Match) list.get(2)).getRule().getName());
    assertEquals("r2", ((Match) list.get(3)).getRule().getName());
    assertEquals(3, ((A) ((Match) list.get(3)).getDeclarationValue("a")).getObject());
    assertEquals("r2", ((Match) list.get(4)).getRule().getName());
    assertEquals(2, ((A) ((Match) list.get(4)).getDeclarationValue("a")).getObject());
    assertEquals("r2", ((Match) list.get(5)).getRule().getName());
    assertEquals(1, ((A) ((Match) list.get(5)).getDeclarationValue("a")).getObject());
  }
  private boolean evalQueryNode(
      LeftInputAdapterNode liaNode,
      PathMemory pmem,
      NetworkNode node,
      long bit,
      Memory nodeMem,
      SegmentMemory[] smems,
      int smemIndex,
      TupleSets<LeftTuple> trgTuples,
      InternalWorkingMemory wm,
      LinkedList<StackEntry> stack,
      TupleSets<LeftTuple> srcTuples,
      LeftTupleSinkNode sink,
      TupleSets<LeftTuple> stagedLeftTuples) {
    QueryElementNodeMemory qmem = (QueryElementNodeMemory) nodeMem;

    if (srcTuples.isEmpty() && qmem.getResultLeftTuples().isEmpty()) {
      // no point in evaluating query element, and setting up stack, if there is nothing to process
      return false;
    }

    QueryElementNode qnode = (QueryElementNode) node;

    if (log.isTraceEnabled()) {
      int offset = getOffset(node);
      log.trace(
          "{} query result tuples {}", indent(offset), qmem.getResultLeftTuples().toStringSizes());
    }

    // result tuples can happen when reactivity occurs inside of the query, prior to evaluation
    // we will need special behaviour to add the results again, when this query result resumes
    trgTuples.addAll(qmem.getResultLeftTuples());
    qmem.setNodeCleanWithoutNotify();

    if (!srcTuples.isEmpty()) {
      // only process the Query Node if there are src tuples
      StackEntry stackEntry =
          new StackEntry(
              liaNode, node, bit, sink, pmem, nodeMem, smems, smemIndex, trgTuples, true, true);

      stack.add(stackEntry);

      pQueryNode.doNode(
          qnode,
          (QueryElementNodeMemory) nodeMem,
          stackEntry,
          wm,
          srcTuples,
          trgTuples,
          stagedLeftTuples);

      SegmentMemory qsmem = ((QueryElementNodeMemory) nodeMem).getQuerySegmentMemory();
      List<PathMemory> qpmems = qsmem.getPathMemories();

      // Build the evaluation information for each 'or' branch
      for (int i = 0; i < qpmems.size(); i++) {
        PathMemory qpmem = qpmems.get(i);

        pmem = qpmem;
        smems = qpmem.getSegmentMemories();
        smemIndex = 0;
        SegmentMemory smem = smems[smemIndex]; // 0
        liaNode = (LeftInputAdapterNode) smem.getRootNode();

        if (liaNode == smem.getTipNode()) {
          // segment only has liaNode in it
          // nothing is staged in the liaNode, so skip to next segment
          smem = smems[++smemIndex]; // 1
          node = smem.getRootNode();
          nodeMem = smem.getNodeMemories().getFirst();
          bit = 1;
        } else {
          // lia is in shared segment, so point to next node
          node = liaNode.getSinkPropagator().getFirstLeftTupleSink();
          nodeMem = smem.getNodeMemories().getFirst().getNext(); // skip the liaNode memory
          bit = 2;
        }

        trgTuples = smem.getStagedLeftTuples().takeAll();
        stackEntry =
            new StackEntry(
                liaNode, node, bit, null, pmem, nodeMem, smems, smemIndex, trgTuples, false, true);
        if (log.isTraceEnabled()) {
          int offset = getOffset(stackEntry.getNode());
          log.trace(
              "{} ORQueue branch={} {} {}",
              indent(offset),
              i,
              stackEntry.getNode().toString(),
              trgTuples.toStringSizes());
        }
        stack.add(stackEntry);
      }
      return true;
    } else {
      return false;
    }
  }
  public void eval2(
      LeftInputAdapterNode liaNode,
      PathMemory rmem,
      NetworkNode node,
      Memory nodeMem,
      SegmentMemory[] smems,
      int smemIndex,
      LeftTupleSets trgTuples,
      InternalWorkingMemory wm,
      LinkedList<StackEntry> stack,
      Set<String> visitedRules,
      boolean processRian,
      RuleExecutor executor) {
    LeftTupleSets srcTuples;
    SegmentMemory smem = smems[smemIndex];
    while (true) {
      srcTuples = trgTuples; // previous target, is now the source
      if (log.isTraceEnabled()) {
        int offset = getOffset(node);
        log.trace(
            "{} {} {} {}", indent(offset), ++cycle, node.toString(), srcTuples.toStringSizes());
      }

      if (NodeTypeEnums.isTerminalNode(node)) {
        TerminalNode rtn = (TerminalNode) node;
        if (node.getType() == NodeTypeEnums.QueryTerminalNode) {
          pQtNode.doNode((QueryTerminalNode) rtn, wm, srcTuples, stack);
        } else {
          pRtNode.doNode(rtn, wm, srcTuples, executor);
        }
        return;
      } else if (NodeTypeEnums.RightInputAdaterNode == node.getType()) {
        doRiaNode2(wm, srcTuples, (RightInputAdapterNode) node, stack);
        return;
      }

      LeftTupleSets stagedLeftTuples;
      if (node == smem.getTipNode() && smem.getFirst() != null) {
        // we are about to process the segment tip, allow it to merge insert/update/delete clashes
        // Can happen if the next segments have not yet been initialized
        stagedLeftTuples = smem.getFirst().getStagedLeftTuples();
      } else {
        stagedLeftTuples = null;
      }

      LeftTupleSinkNode sink = ((LeftTupleSource) node).getSinkPropagator().getFirstLeftTupleSink();

      trgTuples = new LeftTupleSets();

      if (NodeTypeEnums.isBetaNode(node)) {
        BetaNode betaNode = (BetaNode) node;

        BetaMemory bm = null;
        AccumulateMemory am = null;
        if (NodeTypeEnums.AccumulateNode == node.getType()) {
          am = (AccumulateMemory) nodeMem;
          bm = am.getBetaMemory();
        } else {
          bm = (BetaMemory) nodeMem;
        }

        if (processRian && betaNode.isRightInputIsRiaNode()) {
          // if the subnetwork is nested in this segment, it will create srcTuples containing
          // peer LeftTuples, suitable for the node in the main path.
          doRiaNode(
              wm,
              liaNode,
              rmem,
              srcTuples,
              betaNode,
              sink,
              smems,
              smemIndex,
              nodeMem,
              bm,
              stack,
              visitedRules,
              executor);
          return; // return here is doRiaNode queues the evaluation on the stack, which is necessary
          // to handled nested query nodes
        }

        if (!bm.getDequeu().isEmpty()) {
          // If there are no staged RightTuples, then process the Dequeue, popping entries, until
          // another insert/expiration clash
          RightTupleSets rightTuples = bm.getStagedRightTuples();
          if (rightTuples.isEmpty()) {
            // nothing staged, so now process the Dequeu
            Deque<RightTuple> que = bm.getDequeu();
            while (!que.isEmpty()) {
              RightTuple rightTuple = que.peekFirst();
              if (rightTuple.getPropagationContext().getType() == PropagationContext.EXPIRATION
                  &&
                  // Cannot pop an expired fact, if the insert/update has not yet been evaluated.
                  rightTuple.getStagedType() != LeftTuple.NONE) {
                break;
              }

              switch (rightTuple.getPropagationContext().getType()) {
                case PropagationContext.INSERTION:
                case PropagationContext.RULE_ADDITION:
                  rightTuples.addInsert(rightTuple);
                  break;
                case PropagationContext.MODIFICATION:
                  rightTuples.addUpdate(rightTuple);
                  break;
                case PropagationContext.DELETION:
                case PropagationContext.EXPIRATION:
                case PropagationContext.RULE_REMOVAL:
                  rightTuples.addDelete(rightTuple);
                  break;
              }
              que.removeFirst();
            }
          }

          if (!bm.getDequeu().isEmpty()) {
            // The DeQue is not empty, add StackEntry for reprocessing.
            StackEntry stackEntry =
                new StackEntry(
                    liaNode,
                    node,
                    sink,
                    rmem,
                    nodeMem,
                    smems,
                    smemIndex,
                    trgTuples,
                    visitedRules,
                    false);
            stack.add(stackEntry);
          }
        }

        switch (node.getType()) {
          case NodeTypeEnums.JoinNode:
            {
              pJoinNode.doNode(
                  (JoinNode) node, sink, bm, wm, srcTuples, trgTuples, stagedLeftTuples);
              break;
            }
          case NodeTypeEnums.NotNode:
            {
              pNotNode.doNode((NotNode) node, sink, bm, wm, srcTuples, trgTuples, stagedLeftTuples);
              break;
            }
          case NodeTypeEnums.ExistsNode:
            {
              pExistsNode.doNode(
                  (ExistsNode) node, sink, bm, wm, srcTuples, trgTuples, stagedLeftTuples);
              break;
            }
          case NodeTypeEnums.AccumulateNode:
            {
              pAccNode.doNode(
                  (AccumulateNode) node, sink, am, wm, srcTuples, trgTuples, stagedLeftTuples);
              break;
            }
        }
      } else {
        switch (node.getType()) {
          case NodeTypeEnums.EvalConditionNode:
            {
              pEvalNode.doNode(
                  (EvalConditionNode) node,
                  (EvalMemory) nodeMem,
                  sink,
                  wm,
                  srcTuples,
                  trgTuples,
                  stagedLeftTuples);
              break;
            }
          case NodeTypeEnums.FromNode:
            {
              pFromNode.doNode(
                  (FromNode) node,
                  (FromMemory) nodeMem,
                  sink,
                  wm,
                  srcTuples,
                  trgTuples,
                  stagedLeftTuples);
              break;
            }
          case NodeTypeEnums.QueryElementNode:
            {
              QueryElementNodeMemory qmem = (QueryElementNodeMemory) nodeMem;

              if (srcTuples.isEmpty() && qmem.getResultLeftTuples().isEmpty()) {
                // no point in evaluating query element, and setting up stack, if there is nothing
                // to process
                break;
              }

              QueryElementNode qnode = (QueryElementNode) node;
              if (visitedRules == Collections.<String>emptySet()) {
                visitedRules = new HashSet<String>();
              }
              visitedRules.add(qnode.getQueryElement().getQueryName());

              // result tuples can happen when reactivity occurs inside of the query, prior to
              // evaluation
              // we will need special behaviour to add the results again, when this query result
              // resumes
              trgTuples.addAll(qmem.getResultLeftTuples());

              if (!srcTuples.isEmpty()) {
                // only process the Query Node if there are src tuples
                StackEntry stackEntry =
                    new StackEntry(
                        liaNode,
                        node,
                        sink,
                        rmem,
                        nodeMem,
                        smems,
                        smemIndex,
                        trgTuples,
                        visitedRules,
                        true);

                stack.add(stackEntry);

                pQueryNode.doNode(
                    qnode, (QueryElementNodeMemory) nodeMem, stackEntry, sink, wm, srcTuples);

                SegmentMemory qsmem = ((QueryElementNodeMemory) nodeMem).getQuerySegmentMemory();
                List<PathMemory> qrmems = qsmem.getPathMemories();

                // Build the evaluation information for each 'or' branch
                // Exception fo the last, place each entry on the stack, the last one evaluate now.
                for (int i = qrmems.size() - 1; i >= 0; i--) {
                  PathMemory qrmem = qrmems.get(i);

                  rmem = qrmem;
                  smems = qrmem.getSegmentMemories();
                  smemIndex = 0;
                  smem = smems[smemIndex]; // 0
                  liaNode = (LeftInputAdapterNode) smem.getRootNode();

                  if (liaNode == smem.getTipNode()) {
                    // segment only has liaNode in it
                    // nothing is staged in the liaNode, so skip to next segment
                    smem = smems[++smemIndex]; // 1
                    node = smem.getRootNode();
                    nodeMem = smem.getNodeMemories().getFirst();
                  } else {
                    // lia is in shared segment, so point to next node
                    node = liaNode.getSinkPropagator().getFirstLeftTupleSink();
                    nodeMem =
                        smem.getNodeMemories().getFirst().getNext(); // skip the liaNode memory
                  }

                  trgTuples = smem.getStagedLeftTuples();

                  if (i != 0 && !trgTuples.isEmpty()) {
                    // All entries except the last should be placed on the stack for evaluation
                    // later.
                    stackEntry =
                        new StackEntry(
                            liaNode,
                            node,
                            null,
                            rmem,
                            nodeMem,
                            smems,
                            smemIndex,
                            trgTuples,
                            visitedRules,
                            false);
                    if (log.isTraceEnabled()) {
                      int offset = getOffset(stackEntry.getNode());
                      log.trace(
                          "{} ORQueue branch={} {} {}",
                          indent(offset),
                          i,
                          stackEntry.getNode().toString(),
                          trgTuples.toStringSizes());
                    }
                    stack.add(stackEntry);
                  }
                }
                processRian = true; //  make sure it's reset, so ria nodes are processed
                continue;
              }
              break;
            }
          case NodeTypeEnums.ConditionalBranchNode:
            {
              pBranchNode.doNode(
                  (ConditionalBranchNode) node,
                  (ConditionalBranchMemory) nodeMem,
                  sink,
                  wm,
                  srcTuples,
                  trgTuples,
                  stagedLeftTuples,
                  executor);
              break;
            }
        }
      }

      if (node != smem.getTipNode()) {
        // get next node and node memory in the segment
        node = sink;
        nodeMem = nodeMem.getNext();
      } else {
        // Reached end of segment, start on new segment.
        SegmentPropagator.propagate(smem, trgTuples, wm);
        smem = smems[++smemIndex];
        trgTuples = smem.getStagedLeftTuples();
        if (log.isTraceEnabled()) {
          log.trace("Segment {}", smemIndex);
        }
        node = (LeftTupleSink) smem.getRootNode();
        nodeMem = smem.getNodeMemories().getFirst();
      }
      processRian = true; //  make sure it's reset, so ria nodes are processed
    }
  }