Scheduler - Software Development Case Studies in Java - page 31

package scheduler;
import java.util.*;
public class Scheduler {
public static int STEPS # 80;
private Problem problem # null ;
private int bestStep; // the index of the best performance
private double bestValue; // the best performance value
public void setProblem(Problem problem) {
this .problem # problem;
bestStep # 0;
bestValue # 1e9;
problem.init();
}
public double bestValue() { return bestValue; }
public void schedule( double gain) {
Iterator iterator # problem.getResources();
Resource resource;
while (iterator.hasNext()) {
resource # (Resource) iterator.next();
resource.reset();
resource.setGain(gain);
}
// repeats the scheduling step 80 times
for ( int step # 0; step < STEPS; step !! ) {
double totPerformance # 0.0;
// every resource schedules its activities
iterator # problem.getResources();
while (iterator.hasNext())
((Resource) iterator.next()).schedule();
// evaluates the total performance
iterator # problem.getResources();
while (iterator.hasNext())
totPerformance !#
((Resource) iterator.next()).getPerformance();
// evaluates the performance of this scheduling step
if (totPerformance < bestValue) {
bestValue # totPerformance;
// this is the best performance up to now
iterator # problem.getResources();
while (iterator.hasNext())
((Resource) iterator.next()).store();
bestStep # step;
}
}
// restores the the best performance values
iterator # problem.getResources();