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/*******************************************************************************
* Copyright (c) 2010-2014, Bergmann Gabor, Istvan Rath and Daniel Varro
* 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.viatra.runtime.rete.construction.plancompiler;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import tools.refinery.viatra.runtime.matchers.backend.QueryEvaluationHint;
import tools.refinery.viatra.runtime.matchers.context.IQueryMetaContext;
import tools.refinery.viatra.runtime.matchers.psystem.PBody;
import tools.refinery.viatra.runtime.matchers.psystem.queries.PQuery;
import tools.refinery.viatra.runtime.rete.matcher.TimelyConfiguration;
import tools.refinery.viatra.runtime.rete.recipes.ProductionRecipe;
import tools.refinery.viatra.runtime.rete.recipes.ReteNodeRecipe;
import tools.refinery.viatra.runtime.rete.traceability.CompiledQuery;
import tools.refinery.viatra.runtime.rete.traceability.RecipeTraceInfo;
/**
* In a recursive query structure, query composition references can be cut off so that the remaining structure is DAG.
* {@link RecursionCutoffPoint} represents one such cut off query composition.
* When the compilation of the recursive query finishes and the compiled form becomes available,
* the {@link RecursionCutoffPoint} has to be signaled to update parent traces and recipes of the recursive call.
*
* @author Bergmann Gabor
* @noreference This class is not intended to be referenced by clients
*
*/
public class RecursionCutoffPoint {
final Map<PBody, RecipeTraceInfo> futureTraceMap;
final CompiledQuery compiledQuery;
final ProductionRecipe recipe;
final QueryEvaluationHint hint;
public RecursionCutoffPoint(PQuery query, QueryEvaluationHint hint, IQueryMetaContext context, boolean deleteAndRederiveEvaluation, TimelyConfiguration timelyEvaluation) {
super();
this.hint = hint;
this.futureTraceMap = new HashMap<>(); // IMPORTANT: the identity of futureTraceMap.values() will not change
this.compiledQuery = CompilerHelper.makeQueryTrace(query, futureTraceMap, Collections.<ReteNodeRecipe>emptySet(), hint, context, deleteAndRederiveEvaluation, timelyEvaluation);
this.recipe = (ProductionRecipe)compiledQuery.getRecipe();
if (!compiledQuery.getParentRecipeTraces().isEmpty()) {
throw new IllegalArgumentException(String.format("Recursion cut-off point of query %s has trace parents: %s",
compiledQuery.getQuery(),
prettyPrintParentRecipeTraces(compiledQuery.getParentRecipeTraces())));
}
if (!recipe.getParents().isEmpty()) {
throw new IllegalArgumentException(String.format("Recursion cut-off point of query %s has recipe parents: %s",
compiledQuery.getQuery(),
prettyPrintParentRecipeTraces(compiledQuery.getParentRecipeTraces())));
}
}
private String prettyPrintParentRecipeTraces(List<RecipeTraceInfo> trace) {
return trace.stream().map(Object::toString).collect(Collectors.joining(", "));
}
/**
* Signals that compilation of the recursive query has terminated, culminating into the given compiled form.
* The query composition that has been cut off will be connected now.
*/
public void mend(CompiledQuery finalCompiledForm) {
futureTraceMap.putAll(finalCompiledForm.getParentRecipeTracesPerBody());
recipe.getParents().addAll(((ProductionRecipe)finalCompiledForm.getRecipe()).getParents());
}
public CompiledQuery getCompiledQuery() {
return compiledQuery;
}
public ProductionRecipe getRecipe() {
return recipe;
}
}
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