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Implémentation heuristique gloutonne en cours

Faure Paul 2 years ago
parent
commit
74543116eb
1 changed files with 89 additions and 1 deletions
  1. 89
    1
      src/main/java/jobshop/solvers/GreedySolver.java

+ 89
- 1
src/main/java/jobshop/solvers/GreedySolver.java View File

@@ -2,6 +2,10 @@ package jobshop.solvers;
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 import jobshop.Instance;
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 import jobshop.Result;
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+import jobshop.encodings.Task;
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+
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+import java.util.ArrayList;
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+import java.util.Iterator;
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 /** An empty shell to implement a greedy solver. */
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 public class GreedySolver implements Solver {
@@ -14,13 +18,97 @@ public class GreedySolver implements Solver {
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     /** Priority that the solver should use. */
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     final Priority priority;
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+    final ArrayList<Task> tachesRestantes;
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+
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+
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     /** Creates a new greedy solver that will use the given priority. */
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     public GreedySolver(Priority p) {
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         this.priority = p;
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+        this.tachesRestantes = new ArrayList<>();
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+    }
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+
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+    /** return true if t1 est plus prioritaire que t1 **/
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+    private boolean prioritaire(Instance instance, Task t1, Task t2) throws Exception {
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+        boolean rt = false;
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+        switch(priority) {
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+            case SPT:
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+                rt = instance.duration(t1) <= instance.duration(t2);
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+                break;
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+            case LPT:
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+                rt = instance.duration(t1) >= instance.duration(t2);
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+                break;
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+            case SRPT:
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+                int i;
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+                int sigmaT1 = 0;
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+                int sigmaT2 = 0;
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+                for (i=t1.task; i<instance.numTasks; i++) {
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+                    sigmaT1 += instance.duration(t1.job, i);
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+                }
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+                for (i=t2.task; i<instance.numTasks; i++) {
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+                    sigmaT2 += instance.duration(t2.job, i);
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+                }
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+                rt = sigmaT1 <= sigmaT2;
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+                break;
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+            case LRPT:
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+                sigmaT1 = 0;
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+                sigmaT2 = 0;
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+                for (i=t1.task; i<instance.numTasks; i++) {
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+                    sigmaT1 += instance.duration(t1.job, i);
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+                }
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+                for (i=t2.task; i<instance.numTasks; i++) {
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+                    sigmaT2 += instance.duration(t2.job, i);
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+                }
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+                rt = sigmaT1 >= sigmaT2;
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+                break;
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+            case EST_SPT:
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+                throw new Exception("UNKNOWN PRIORITY");
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+                //break;
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+            case EST_LPT:
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+                throw new Exception("UNKNOWN PRIORITY");
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+                //break;
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+            case EST_SRPT:
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+                throw new Exception("UNKNOWN PRIORITY");
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+                //break;
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+            case EST_LRPT:
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+                throw new Exception("UNKNOWN PRIORITY");
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+                //break;
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+        }
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+        return rt;
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+    }
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+
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+    private void addTask(Instance instance, Task task) throws Exception {
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+        Iterator<Task> iter = this.tachesRestantes.iterator();
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+        int index = 0;
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+        boolean trouve = false;
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+        while (iter.hasNext() && !trouve) {
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+            Task current = iter.next();
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+            if (this.prioritaire(instance, task, current)) {
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+                trouve = true;
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+                this.tachesRestantes.add(index, task);
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+            } else {
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+                index++;
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+            }
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+        }
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     }
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     @Override
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     public Result solve(Instance instance, long deadline) {
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-        throw new UnsupportedOperationException();
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+        //Initialisation
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+        int i;
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+        for (i=0; i<instance.numJobs; i++) {
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+            try {
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+                addTask(instance, new Task(i,0));
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+            } catch (Exception e) {
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+                System.out.println("ERREUR POLITIQUE DE PRIORITE INCONNUE");
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+                System.exit(2);
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+            }
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+        }
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+        Result result = null;
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+
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+        //Itérations
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+        while (!this.tachesRestantes.isEmpty()) {
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+            //TAF
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+        }
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+        return result;
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     }
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 }

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