/** Updates the given sink propagating all previously propagated tuples to it */
public void updateSink(
final LeftTupleSink sink,
final PropagationContext context,
final InternalWorkingMemory workingMemory) {
final BetaMemory memory = (BetaMemory) workingMemory.getNodeMemory(this);
Iterator it = memory.getRightTupleMemory().iterator();
// Relies on the fact that any propagated LeftTuples are blocked, but due to lazy blocking
// they will only be blocked once. So we can iterate the right memory to find the left tuples to
// propagate
for (RightTuple rightTuple = (RightTuple) it.next();
rightTuple != null;
rightTuple = (RightTuple) it.next()) {
LeftTuple leftTuple = rightTuple.getBlocked();
while (leftTuple != null) {
sink.assertLeftTuple(
sink.createLeftTuple(leftTuple, sink, context, true), context, workingMemory);
leftTuple = leftTuple.getBlockedNext();
}
}
}
public void modifyRightTuple(
RightTuple rightTuple, PropagationContext context, InternalWorkingMemory workingMemory) {
final BetaMemory memory = (BetaMemory) workingMemory.getNodeMemory(this);
if (memory.getLeftTupleMemory() == null
|| (memory.getLeftTupleMemory().size() == 0 && rightTuple.getBlocked() == null)) {
// do nothing here, as we know there are no left tuples
// normally do this at the end, but as we are exiting early, make sure the buckets are still
// correct.
memory.getRightTupleMemory().removeAdd(rightTuple);
return;
}
// TODO: wtd with behaviours?
// if ( !behavior.assertRightTuple( memory.getBehaviorContext(),
// rightTuple,
// workingMemory ) ) {
// // destroy right tuple
// rightTuple.unlinkFromRightParent();
// return;
// }
this.constraints.updateFromFactHandle(
memory.getContext(), workingMemory, rightTuple.getFactHandle());
LeftTupleMemory leftMemory = memory.getLeftTupleMemory();
FastIterator leftIt = getLeftIterator(leftMemory);
LeftTuple firstLeftTuple = getFirstLeftTuple(rightTuple, leftMemory, context, leftIt);
LeftTuple firstBlocked = rightTuple.getBlocked();
// we now have reference to the first Blocked, so null it in the rightTuple itself, so we can
// rebuild
rightTuple.nullBlocked();
// first process non-blocked tuples, as we know only those ones are in the left memory.
for (LeftTuple leftTuple = firstLeftTuple; leftTuple != null; ) {
// preserve next now, in case we remove this leftTuple
LeftTuple temp = (LeftTuple) leftIt.next(leftTuple);
// we know that only unblocked LeftTuples are still in the memory
if (this.constraints.isAllowedCachedRight(memory.getContext(), leftTuple)) {
leftTuple.setBlocker(rightTuple);
rightTuple.addBlocked(leftTuple);
// this is now blocked so remove from memory
leftMemory.remove(leftTuple);
// subclasses like ForallNotNode might override this propagation
this.sink.propagateAssertLeftTuple(leftTuple, context, workingMemory, true);
}
leftTuple = temp;
}
RightTupleMemory rightTupleMemory = memory.getRightTupleMemory();
if (firstBlocked != null) {
boolean useComparisonIndex = rightTupleMemory.getIndexType().isComparison();
// now process existing blocks, we only process existing and not new from above loop
FastIterator rightIt = getRightIterator(rightTupleMemory);
RightTuple rootBlocker = useComparisonIndex ? null : (RightTuple) rightIt.next(rightTuple);
RightTupleList list = rightTuple.getMemory();
// we must do this after we have the next in memory
// We add to the end to give an opportunity to re-match if in same bucket
rightTupleMemory.removeAdd(rightTuple);
if (!useComparisonIndex && rootBlocker == null && list == rightTuple.getMemory()) {
// we are at the end of the list, but still in same bucket, so set to self, to give self a
// chance to rematch
rootBlocker = rightTuple;
}
// iterate all the existing previous blocked LeftTuples
for (LeftTuple leftTuple = (LeftTuple) firstBlocked; leftTuple != null; ) {
LeftTuple temp = leftTuple.getBlockedNext();
leftTuple.setBlockedPrevious(null); // must null these as we are re-adding them to the list
leftTuple.setBlockedNext(null);
leftTuple.setBlocker(null);
this.constraints.updateFromTuple(memory.getContext(), workingMemory, leftTuple);
if (useComparisonIndex) {
rootBlocker =
getFirstRightTuple(
leftTuple,
rightTupleMemory,
(InternalFactHandle) context.getFactHandle(),
rightIt);
}
// we know that older tuples have been checked so continue next
for (RightTuple newBlocker = rootBlocker;
newBlocker != null;
newBlocker = (RightTuple) rightIt.next(newBlocker)) {
if (this.constraints.isAllowedCachedLeft(
memory.getContext(), newBlocker.getFactHandle())) {
leftTuple.setBlocker(newBlocker);
newBlocker.addBlocked(leftTuple);
break;
}
}
if (leftTuple.getBlocker() == null) {
// was previous blocked and not in memory, so add
memory.getLeftTupleMemory().add(leftTuple);
// subclasses like ForallNotNode might override this propagation
this.sink.propagateRetractLeftTuple(leftTuple, context, workingMemory);
}
leftTuple = temp;
}
} else {
// we had to do this at the end, rather than beginning as this 'if' block needs the next
// memory tuple
rightTupleMemory.removeAdd(rightTuple);
}
this.constraints.resetFactHandle(memory.getContext());
this.constraints.resetTuple(memory.getContext());
}
/**
* Retract the <code>FactHandleImpl</code>. If the handle has any <code>ReteTuple</code> matches
* and those tuples now have no other match, retract tuple
*
* @param handle the <codeFactHandleImpl</code> being retracted
* @param context The <code>PropagationContext</code>
* @param workingMemory The working memory session.
*/
public void retractRightTuple(
final RightTuple rightTuple,
final PropagationContext context,
final InternalWorkingMemory workingMemory) {
final BetaMemory memory = (BetaMemory) workingMemory.getNodeMemory(this);
if (isUnlinkingEnabled()) {
doDeleteRightTuple(rightTuple, workingMemory, memory);
return;
}
RightTupleMemory rightTupleMemory = memory.getRightTupleMemory();
boolean useComparisonIndex = rightTupleMemory.getIndexType().isComparison();
FastIterator rightIt = rightTupleMemory.fastIterator();
RightTuple rootBlocker = useComparisonIndex ? null : (RightTuple) rightIt.next(rightTuple);
rightTupleMemory.remove(rightTuple);
rightTuple.setMemory(null);
if (rightTuple.getBlocked() == null) {
return;
}
for (LeftTuple leftTuple = (LeftTuple) rightTuple.getBlocked(); leftTuple != null; ) {
LeftTuple temp = leftTuple.getBlockedNext();
leftTuple.setBlocker(null);
leftTuple.setBlockedPrevious(null);
leftTuple.setBlockedNext(null);
this.constraints.updateFromTuple(memory.getContext(), workingMemory, leftTuple);
if (useComparisonIndex) {
rootBlocker =
getFirstRightTuple(
leftTuple, rightTupleMemory, (InternalFactHandle) context.getFactHandle(), rightIt);
}
// we know that older tuples have been checked so continue previously
for (RightTuple newBlocker = rootBlocker;
newBlocker != null;
newBlocker = (RightTuple) rightIt.next(newBlocker)) {
if (this.constraints.isAllowedCachedLeft(memory.getContext(), newBlocker.getFactHandle())) {
leftTuple.setBlocker(newBlocker);
newBlocker.addBlocked(leftTuple);
break;
}
}
if (leftTuple.getBlocker() == null) {
// was previous blocked and not in memory, so add
memory.getLeftTupleMemory().add(leftTuple);
this.sink.propagateRetractLeftTuple(leftTuple, context, workingMemory);
}
leftTuple = temp;
}
rightTuple.nullBlocked();
this.constraints.resetTuple(memory.getContext());
}