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/*******************************************************************************
* Copyright (c) 2010-2015, 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.matchers.context;
import tools.refinery.viatra.runtime.matchers.ViatraQueryRuntimeException;
import tools.refinery.viatra.runtime.matchers.backend.IQueryBackend;
import tools.refinery.viatra.runtime.matchers.backend.IQueryResultProvider;
import tools.refinery.viatra.runtime.matchers.psystem.queries.PQuery;
/**
* Provides information on already cached queries to query evaluator backends at runtime.
*
* @author Bergmann Gabor
*
*/
public interface IQueryCacheContext {
/**
* Checks if there already is a caching result provider for the given query.
* <p> Returns false if called while the caching result provider of the given query is being constructed in the first place.
*/
public boolean isResultCached(PQuery query);
/**
* Returns a caching result provider for the given query; it must be constructed if it does not exist yet.
* <p> <b>Caution:</b> behavior undefined if called while the caching result provider of the given query is being constructed.
* Beware of infinite loops.
* <p> <b>Postcondition:</b> {@link IQueryBackend#isCaching()} returns true for the {@link #getQueryBackend()} of the returned provider
*
* @throws ViatraQueryRuntimeException
*/
public IQueryResultProvider getCachingResultProvider(PQuery query);
}
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