Ejemplo n.º 1
0
 private void calculateBruteForceAll() {
   TableFilter[] list = new TableFilter[filters.length];
   Permutations<TableFilter> p = Permutations.create(filters, list);
   for (int x = 0; !canStop(x) && p.next(); x++) {
     testPlan(list);
   }
 }
Ejemplo n.º 2
0
 private void calculateBruteForceSome() {
   int bruteForce = getMaxBruteForceFilters(filters.length);
   TableFilter[] list = new TableFilter[filters.length];
   Permutations<TableFilter> p = Permutations.create(filters, list, bruteForce);
   for (int x = 0; !canStop(x) && p.next(); x++) {
     // find out what filters are not used yet
     for (TableFilter f : filters) {
       f.setUsed(false);
     }
     for (int i = 0; i < bruteForce; i++) {
       list[i].setUsed(true);
     }
     // fill the remaining elements with the unused elements (greedy)
     for (int i = bruteForce; i < filters.length; i++) {
       double costPart = -1.0;
       int bestPart = -1;
       for (int j = 0; j < filters.length; j++) {
         if (!filters[j].isUsed()) {
           if (i == filters.length - 1) {
             bestPart = j;
             break;
           }
           list[i] = filters[j];
           Plan part = new Plan(list, i + 1, condition);
           double costNow = part.calculateCost(session);
           if (costPart < 0 || costNow < costPart) {
             costPart = costNow;
             bestPart = j;
           }
         }
       }
       filters[bestPart].setUsed(true);
       list[i] = filters[bestPart];
     }
     testPlan(list);
   }
 }