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/*******************************************************************************
* Copyright (c) 2010-2016, Gabor Bergmann, IncQueryLabs Ltd.
* 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.util;
import tools.refinery.viatra.runtime.matchers.backend.QueryEvaluationHint;
import tools.refinery.viatra.runtime.matchers.backend.QueryHintOption;
import tools.refinery.viatra.runtime.rete.matcher.DRedReteBackendFactory;
/**
* Provides key objects (of type {@link QueryHintOption}) for {@link QueryEvaluationHint}s.
* @author Gabor Bergmann
* @since 1.5
*/
public final class ReteHintOptions {
private ReteHintOptions() {/*Utility class constructor*/}
public static final QueryHintOption<Boolean> useDiscriminatorDispatchersForConstantFiltering =
hintOption("useDiscriminatorDispatchersForConstantFiltering", true);
public static final QueryHintOption<Boolean> prioritizeConstantFiltering =
hintOption("prioritizeConstantFiltering", true);
public static final QueryHintOption<Boolean> cacheOutputOfEvaluatorsByDefault =
hintOption("cacheOutputOfEvaluatorsByDefault", true);
/**
* The incremental query evaluator backend can evaluate recursive patterns.
* However, by default, instance models that contain cycles are not supported with recursive queries
* and can lead to incorrect query results.
* Enabling Delete And Rederive (DRED) mode guarantees that recursive query evaluation leads to correct results in these cases as well.
*
* <p> As DRED may diminish the performance of incremental maintenance, it is not enabled by default.
* @since 1.6
* @deprecated Use {@link DRedReteBackendFactory} instead of setting this option to true.
*/
@Deprecated
public static final QueryHintOption<Boolean> deleteRederiveEvaluation =
hintOption("deleteRederiveEvaluation", false);
/**
* This hint allows the query planner to take advantage of "weakened alternative" suggestions of the meta context.
* For instance, enumerable unary type constraints may be substituted with a simple type filtering where sufficient.
*
* @since 1.6
*/
public static final QueryHintOption<Boolean> expandWeakenedAlternativeConstraints =
hintOption("expandWeakenedAlternativeConstraints", true);
// internal helper for conciseness
private static <T> QueryHintOption<T> hintOption(String hintKeyLocalName, T defaultValue) {
return new QueryHintOption<>(ReteHintOptions.class, hintKeyLocalName, defaultValue);
}
}
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