com.sri.ai.distributed.experiment.SimpleExperiment.java Source code

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/*
 * Copyright (c) 2015, SRI International
 * All rights reserved.
 * Licensed under the The BSD 3-Clause License;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 * 
 * http://opensource.org/licenses/BSD-3-Clause
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the aic-expresso nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.sri.ai.distributed.experiment;

import java.util.StringJoiner;

import com.google.common.base.Stopwatch;
import com.sri.ai.distributed.sat.CNFProblem;
import com.sri.ai.distributed.sat.DistributedSATSolver;
import com.sri.ai.distributed.sat.LocalSATSolver;
import com.sri.ai.distributed.sat.SATSolver;
import com.sri.ai.distributed.sat.reader.DIMACSReader;
import com.sri.ai.distributed.sat.reader.SimplifiedDIMACSReader;

/**
 * 
 * @author oreilly
 *
 */
public class SimpleExperiment {

    private static final boolean USE_DISTRIBUTED_SOLVER = true;

    public static void main(String[] args) {
        String cnfFileName = args[0];
        DIMACSReader dimacsReader = new SimplifiedDIMACSReader();

        CNFProblem cnfProblem = dimacsReader.read(cnfFileName);

        cnfProblem.getClauses().cache();

        System.out.println("# variables        = " + cnfProblem.getNumberVariables());
        System.out.println("# clauses reported = " + cnfProblem.getNumberClauses() + ", number clauses loaded = "
                + cnfProblem.getClauses().count());

        Stopwatch sw = new Stopwatch();

        sw.start();
        SATSolver solver = newSolver();
        int[] model = solver.findModel(cnfProblem);
        sw.stop();

        System.out.println("Took " + sw);

        if (model == null) {
            System.out.println("Problem is NOT satisfiable");
        } else {
            StringJoiner sj = new StringJoiner(", ");
            for (int i = 0; i < model.length; i++) {
                sj.add("" + model[i]);
            }

            System.out.println("Problem is satisfiable, example model found:" + sj);
        }
    }

    private static SATSolver newSolver() {
        SATSolver result = null;
        if (USE_DISTRIBUTED_SOLVER) {
            result = new DistributedSATSolver();
        } else {
            result = new LocalSATSolver();
        }
        return result;
    }
}