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/*******************************************************************************
* Copyright (c) 2010-2014, Bergmann Gabor, Istvan Rath and Daniel Varro
* Copyright (c) 2023 The Refinery Authors <https://refinery.tools>
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.interpreter.rete.network;
import tools.refinery.interpreter.matchers.tuple.Tuple;
import tools.refinery.interpreter.rete.aggregation.IndexerBasedAggregatorNode;
import tools.refinery.interpreter.rete.boundary.InputConnector;
import tools.refinery.interpreter.rete.eval.RelationEvaluatorNode;
import tools.refinery.interpreter.rete.index.DualInputNode;
import tools.refinery.interpreter.rete.index.Indexer;
import tools.refinery.interpreter.rete.index.IterableIndexer;
import tools.refinery.interpreter.rete.index.ProjectionIndexer;
import tools.refinery.interpreter.rete.recipes.*;
import tools.refinery.interpreter.rete.remote.Address;
import tools.refinery.interpreter.rete.traceability.RecipeTraceInfo;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* Class responsible for connecting freshly instantiating Rete nodes to their parents.
*
* @author Bergmann Gabor
*
*/
class ConnectionFactory {
ReteContainer reteContainer;
public ConnectionFactory(ReteContainer reteContainer) {
super();
this.reteContainer = reteContainer;
}
// TODO move to node implementation instead?
private boolean isStateful(ReteNodeRecipe recipe) {
return recipe instanceof ProjectionIndexerRecipe || recipe instanceof IndexerBasedAggregatorRecipe
|| recipe instanceof SingleColumnAggregatorRecipe || recipe instanceof ExpressionEnforcerRecipe
|| recipe instanceof TransitiveClosureRecipe || recipe instanceof ProductionRecipe
|| recipe instanceof UniquenessEnforcerRecipe || recipe instanceof RelationEvaluationRecipe;
}
/**
* PRE: nodes for parent recipes must already be created and registered
* <p>
* PRE: must not be an input node (for which {@link InputConnector} is responsible)
*/
public void connectToParents(RecipeTraceInfo recipeTrace, Node freshNode) {
final ReteNodeRecipe recipe = recipeTrace.getRecipe();
if (recipe instanceof ConstantRecipe) {
// NO-OP
} else if (recipe instanceof InputRecipe) {
throw new IllegalArgumentException(
ConnectionFactory.class.getSimpleName() + " not intended for input connection: " + recipe);
} else if (recipe instanceof SingleParentNodeRecipe) {
final Receiver receiver = (Receiver) freshNode;
ReteNodeRecipe parentRecipe = ((SingleParentNodeRecipe) recipe).getParent();
connectToParent(recipe, receiver, parentRecipe);
} else if (recipe instanceof RelationEvaluationRecipe) {
List<ReteNodeRecipe> parentRecipes = ((MultiParentNodeRecipe) recipe).getParents();
List<Supplier> parentSuppliers = new ArrayList<Supplier>();
for (final ReteNodeRecipe parentRecipe : parentRecipes) {
parentSuppliers.add(getSupplierForRecipe(parentRecipe));
}
((RelationEvaluatorNode) freshNode).connectToParents(parentSuppliers);
} else if (recipe instanceof BetaRecipe) {
final DualInputNode beta = (DualInputNode) freshNode;
final ArrayList<RecipeTraceInfo> parentTraces = new ArrayList<RecipeTraceInfo>(
recipeTrace.getParentRecipeTraces());
Slots slots = avoidActiveNodeConflict(parentTraces.get(0), parentTraces.get(1));
beta.connectToIndexers(slots.primary, slots.secondary);
} else if (recipe instanceof IndexerBasedAggregatorRecipe) {
final IndexerBasedAggregatorNode aggregator = (IndexerBasedAggregatorNode) freshNode;
final IndexerBasedAggregatorRecipe aggregatorRecipe = (IndexerBasedAggregatorRecipe) recipe;
aggregator.initializeWith((ProjectionIndexer) resolveIndexer(aggregatorRecipe.getParent()));
} else if (recipe instanceof MultiParentNodeRecipe) {
final Receiver receiver = (Receiver) freshNode;
List<ReteNodeRecipe> parentRecipes = ((MultiParentNodeRecipe) recipe).getParents();
for (ReteNodeRecipe parentRecipe : parentRecipes) {
connectToParent(recipe, receiver, parentRecipe);
}
}
}
private Indexer resolveIndexer(final IndexerRecipe indexerRecipe) {
final Address<? extends Node> address = reteContainer.getNetwork().getExistingNodeByRecipe(indexerRecipe);
return (Indexer) reteContainer.resolveLocal(address);
}
private void connectToParent(ReteNodeRecipe recipe, Receiver freshNode, ReteNodeRecipe parentRecipe) {
final Supplier parentSupplier = getSupplierForRecipe(parentRecipe);
// special synch
if (freshNode instanceof ReinitializedNode) {
Collection<Tuple> tuples = new ArrayList<Tuple>();
parentSupplier.pullInto(tuples, true);
((ReinitializedNode) freshNode).reinitializeWith(tuples);
reteContainer.connect(parentSupplier, freshNode);
} else { // default case
// stateless nodes do not have to be synced with contents UNLESS they already have children (recursive
// corner case)
if (isStateful(recipe)
|| ((freshNode instanceof Supplier) && !((Supplier) freshNode).getReceivers().isEmpty())) {
reteContainer.connectAndSynchronize(parentSupplier, freshNode);
} else {
// stateless node, no synch
reteContainer.connect(parentSupplier, freshNode);
}
}
}
private Supplier getSupplierForRecipe(ReteNodeRecipe recipe) {
@SuppressWarnings("unchecked")
final Address<? extends Supplier> parentAddress = (Address<? extends Supplier>) reteContainer.getNetwork()
.getExistingNodeByRecipe(recipe);
final Supplier supplier = reteContainer.getProvisioner().asSupplier(parentAddress);
return supplier;
}
/**
* If two indexers share their active node, joining them via DualInputNode is error-prone. Exception: coincidence of
* the two indexers is supported.
*
* @return a replacement for the secondary Indexers, if needed
*/
private Slots avoidActiveNodeConflict(final RecipeTraceInfo primarySlot, final RecipeTraceInfo secondarySlot) {
Slots result = new Slots();
result.primary = (IterableIndexer) resolveIndexer((ProjectionIndexerRecipe) primarySlot.getRecipe());
result.secondary = resolveIndexer((IndexerRecipe) secondarySlot.getRecipe());
if (activeNodeConflict(result.primary, result.secondary)) {
if (result.secondary instanceof IterableIndexer) {
result.secondary = resolveActiveIndexer(secondarySlot);
} else {
result.primary = (IterableIndexer) resolveActiveIndexer(primarySlot);
}
}
return result;
}
private Indexer resolveActiveIndexer(final RecipeTraceInfo inactiveIndexerTrace) {
final RecipeTraceInfo activeIndexerTrace = reteContainer.getProvisioner()
.accessActiveIndexer(inactiveIndexerTrace);
reteContainer.getProvisioner().getOrCreateNodeByRecipe(activeIndexerTrace);
return resolveIndexer((ProjectionIndexerRecipe) activeIndexerTrace.getRecipe());
}
private static class Slots {
IterableIndexer primary;
Indexer secondary;
}
/**
* If two indexers share their active node, joining them via DualInputNode is error-prone. Exception: coincidence of
* the two indexers is supported.
*
* @return true if there is a conflict of active nodes.
*/
private boolean activeNodeConflict(Indexer primarySlot, Indexer secondarySlot) {
return !primarySlot.equals(secondarySlot) && primarySlot.getActiveNode().equals(secondarySlot.getActiveNode());
}
}
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