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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.matchers.backend;
import tools.refinery.viatra.runtime.matchers.context.IQueryBackendContext;
import tools.refinery.viatra.runtime.matchers.psystem.queries.PQuery;
/**
* A Query Backend Factory identifies a query evaluator implementation, and can create an evaluator instance (an {@link IQueryBackend}) tied to a specific VIATRA Query engine upon request.
*
* <p> The factory is used as a lookup key for the backend instance,
* therefore implementors should either be singletons, or implement equals() / hashCode() accordingly.
*
* @author Bergmann Gabor
*
*/
public interface IQueryBackendFactory {
/**
* Creates a new {@link IQueryBackend} instance tied to the given context elements.
*
* @return an instance of the class returned by {@link #getBackendClass()} that operates in the given context.
* @since 1.5
*/
public IQueryBackend
create(IQueryBackendContext context);
/**
* The backend instances created by this factory are guaranteed to conform to the returned class.
*/
public Class<? extends IQueryBackend> getBackendClass();
/**
* Calculate the required capabilities, which are needed to execute the given pattern
*
* @since 1.4
*/
public IMatcherCapability calculateRequiredCapability(PQuery query, QueryEvaluationHint hint);
/**
* Returns whether the current backend is caching
* @since 2.0
*/
public boolean isCaching();
}
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