apis/examples_java/Clad_8java_source.html

package com.gams.examples.clad;


 import java.io.BufferedWriter;

 import java.io.ByteArrayOutputStream;

 import java.io.File;

 import java.io.FileWriter;

 import java.io.PrintStream;

 import java.util.AbstractMap;

 import java.util.ArrayList;

 import java.util.List;

 import java.util.Map;


 import com.gams.api.GAMSException;

 import com.gams.api.GAMSJob;

 import com.gams.api.GAMSOptions;

 import com.gams.api.GAMSWorkspace;

 import com.gams.api.GAMSWorkspaceInfo;


 public class Clad {


     public static void main(String[] args) {

         GAMSWorkspaceInfo  wsInfo  = new GAMSWorkspaceInfo();

         if (args.length > 0)

             wsInfo.setSystemDirectory( args[0] );


         File workingDirectory = new File(System.getProperty("user.dir"), "Clad");

         workingDirectory.mkdir();

         wsInfo.setWorkingDirectory(workingDirectory.getAbsolutePath());


         GAMSWorkspace ws = new GAMSWorkspace(wsInfo);


         List<Map.Entry<Long,String>> steps = new ArrayList<Map.Entry<Long,String>>();

         steps.add( new AbstractMap.SimpleEntry<Long, String>( new Long(5), "epgap 0.1" ) );

         steps.add( new AbstractMap.SimpleEntry<Long, String>( new Long(10), "epgap 0.2" ));

         steps.add( new AbstractMap.SimpleEntry<Long, String>( new Long(20), "epagap 1e9" ));


         GAMSJob job = ws.addJobFromGamsLib("clad");


         try {

             File logFile = new File(ws.workingDirectory(), "cplex.opt");

             BufferedWriter outfile = new BufferedWriter(new FileWriter(logFile));

             outfile.write("epgap 0");             outfile.newLine();

             outfile.write("interactive 1");       outfile.newLine();

             outfile.write("iafile cplex.op2");    outfile.newLine();

             outfile.close();

         } catch (Exception e) {

             e.printStackTrace();

             System.exit(1);

         }


         GAMSOptions opt = ws.addOptions();

         opt.setMIP( "cplex" );

         opt.setOptFile( 1 );

         opt.setSolveLink(  GAMSOptions.ESolveLink.LoadLibrary );


         ByteArrayOutputStream os = new ByteArrayOutputStream();

         PrintStream ps = new PrintStream(os);


         Worker w  = new Worker(job, opt, ps);

         w.start();


         long prevStep = 0;

         for (Map.Entry<Long, String> entry : steps) {

             long diffInSeconds = entry.getKey().longValue() - prevStep ;

             try {

                 System.out.println("** waiting "+ diffInSeconds * 1000+ " milliseconds");

                 w.join( diffInSeconds * 1000 );

             } catch( Exception e ) {

                 System.out.println("** Exception has been caught : "+e);

                 break;

             }


             prevStep = entry.getKey().longValue();

             try {

                 File logFile = new File(ws.workingDirectory(), "cplex.op2");

                 BufferedWriter outfile = new BufferedWriter(new FileWriter(logFile));

                 outfile.write( entry.getValue() );       outfile.newLine();

                 outfile.close();

             } catch (Exception e) {

                 e.printStackTrace();

                 System.exit(1);

             }

             job.interrupt();

             System.out.println("** Interrupted Cplex to continue with new option: " + entry.getValue());

         }

         if (w.isAlive()) {

             try {

                 w.join();

             } catch (InterruptedException e) { }

         }


         String log = os.toString();

         if (!log.contains("Interrupted...")) {

             System.out.println("** Solver log **");

             System.out.println(log);

             System.out.println();

             System.out.println("** Expected the solver to be interrupted at least once.");

             System.exit(1);

         }

         System.out.println("** Interrupted...");

         System.exit(0);

    }


    static class Worker extends Thread {

         GAMSJob job;

         PrintStream output;

         GAMSOptions option;


         public Worker(GAMSJob jb, GAMSOptions opt, PrintStream out) {

             job = jb;

             option = opt;

             output = out;

         }


         public void run() throws GAMSException {

             job.run(option, output);

         }

    }

 }