1 /*******************************************************************************
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004, 2012 Artois University and CNRS
3 *
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
8 *
9 * Alternatively, the contents of this file may be used under the terms of
10 * either the GNU Lesser General Public License Version 2.1 or later (the
11 * "LGPL"), in which case the provisions of the LGPL are applicable instead
12 * of those above. If you wish to allow use of your version of this file only
13 * under the terms of the LGPL, and not to allow others to use your version of
14 * this file under the terms of the EPL, indicate your decision by deleting
15 * the provisions above and replace them with the notice and other provisions
16 * required by the LGPL. If you do not delete the provisions above, a recipient
17 * may use your version of this file under the terms of the EPL or the LGPL.
18 *
19 * Based on the original MiniSat specification from:
20 *
21 * An extensible SAT solver. Niklas Een and Niklas Sorensson. Proceedings of the
22 * Sixth International Conference on Theory and Applications of Satisfiability
23 * Testing, LNCS 2919, pp 502-518, 2003.
24 *
25 * See www.minisat.se for the original solver in C++.
26 *
27 * Contributors:
28 * CRIL - initial API and implementation
29 *******************************************************************************/
30 package org.sat4j.minisat.core;
31
32 import java.io.Serializable;
33
34 import org.sat4j.specs.IVec;
35
36 /**
37 * Strategy for cleaning the database of learned clauses.
38 *
39 * @author leberre
40 *
41 */
42 public interface LearnedConstraintsDeletionStrategy extends Serializable {
43
44 /**
45 *
46 */
47 void init();
48
49 ConflictTimer getTimer();
50
51 /**
52 * Hook method called when the solver wants to reduce the set of learned
53 * clauses.
54 *
55 * @param learnedConstrs
56 */
57 void reduce(IVec<Constr> learnedConstrs);
58
59 /**
60 * Hook method called when a new clause has just been derived during
61 * conflict analysis.
62 *
63 * @param outLearnt
64 */
65 void onClauseLearning(Constr outLearnt);
66
67 /**
68 * Hook method called on constraints participating to the conflict analysis.
69 *
70 * @param reason
71 */
72 void onConflictAnalysis(Constr reason);
73
74 /**
75 * Hook method called when a unit clause is propagated thanks to from.
76 *
77 * @param from
78 */
79 void onPropagation(Constr from);
80 }