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/*******************************************************************************
* Copyright (c) 2010-2014, Miklos Foldenyi, Andras Szabolcs Nagy, Abel Hegedus, Akos Horvath, Zoltan Ujhelyi 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 org.eclipse.viatra.dse.objectives;
import org.eclipse.viatra.dse.base.ThreadContext;
/**
*
* Implementation of this interface represents a global constraint of the DSE problem, which can halt an exploration
* continuing from a state which dissatisfies the global constraint.
* <p>
* Certain global constraints can have inner state for the validation. In this case a new instance is necessary for
* every new thread, and the {@code createNew} method should not return the same instance more than once.
*
* @author Andras Szabolcs Nagy
*
*/
public interface IGlobalConstraint {
/**
* Returns the name of the global constraint.
*
* @return The name of the global constraint.
*/
String getName();
/**
* Checks whether the current state satisfies the global constraint.
*
* @param context
* The {@link ThreadContext} which contains the necessary information.
* @return True if the state is valid and exploration can be continued from the actual state.
*/
boolean checkGlobalConstraint(ThreadContext context);
/**
* Initializes the global constraint. It is called exactly once for every thread starts.
*
* @param context
* The {@link ThreadContext}.
*/
void init(ThreadContext context);
/**
* Returns an instance of the {@link IGlobalConstraint}. If it returns the same instance, all the methods has to be
* thread save as they are called concurrently.
*
* @return An instance of the global constraint.
*/
IGlobalConstraint createNew();
}
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