fix: Lukas' comments

core/core-impl/src/main/java/ai/timefold/solver/core/impl/heuristic/HeuristicConfigPolicy.java

@@ -2,6 +2,7 @@
 
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Random;
 import java.util.concurrent.ThreadFactory;
 
 import ai.timefold.solver.core.config.heuristic.selector.entity.EntitySorterManner;
@@ -38,6 +39,7 @@ public class HeuristicConfigPolicy<Solution_> {
     private final boolean initializedChainedValueFilterEnabled;
     private final boolean unassignedValuesAllowed;
     private final Class<? extends NearbyDistanceMeter<?, ?>> nearbyDistanceMeterClass;
+    private final Random random;
 
     private final Map<String, EntityMimicRecorder<Solution_>> entityMimicRecorderMap = new HashMap<>();
     private final Map<String, SubListMimicRecorder<Solution_>> subListMimicRecorderMap = new HashMap<>();
@@ -58,6 +60,7 @@ private HeuristicConfigPolicy(Builder<Solution_> builder) {
         this.initializedChainedValueFilterEnabled = builder.initializedChainedValueFilterEnabled;
         this.unassignedValuesAllowed = builder.unassignedValuesAllowed;
         this.nearbyDistanceMeterClass = builder.nearbyDistanceMeterClass;
+        this.random = builder.random;
     }
 
     public EnvironmentMode getEnvironmentMode() {
@@ -116,13 +119,17 @@ public Class<? extends NearbyDistanceMeter> getNearbyDistanceMeterClass() {
         return nearbyDistanceMeterClass;
     }
 
+    public Random getRandom() {
+        return random;
+    }
+
     // ************************************************************************
     // Builder methods
     // ************************************************************************
 
     public Builder<Solution_> cloneBuilder() {
         return new Builder<>(environmentMode, moveThreadCount, moveThreadBufferSize, threadFactoryClass,
-                nearbyDistanceMeterClass, initializingScoreTrend, solutionDescriptor, classInstanceCache)
+                nearbyDistanceMeterClass, random, initializingScoreTrend, solutionDescriptor, classInstanceCache)
                 .withLogIndentation(logIndentation);
     }
 
@@ -223,17 +230,19 @@ public static class Builder<Solution_> {
         private boolean unassignedValuesAllowed = false;
 
         private final Class<? extends NearbyDistanceMeter<?, ?>> nearbyDistanceMeterClass;
+        private final Random random;
 
         public Builder(EnvironmentMode environmentMode, Integer moveThreadCount, Integer moveThreadBufferSize,
                 Class<? extends ThreadFactory> threadFactoryClass,
-                Class<? extends NearbyDistanceMeter<?, ?>> nearbyDistanceMeterClass,
+                Class<? extends NearbyDistanceMeter<?, ?>> nearbyDistanceMeterClass, Random random,
                 InitializingScoreTrend initializingScoreTrend, SolutionDescriptor<Solution_> solutionDescriptor,
                 ClassInstanceCache classInstanceCache) {
             this.environmentMode = environmentMode;
             this.moveThreadCount = moveThreadCount;
             this.moveThreadBufferSize = moveThreadBufferSize;
             this.threadFactoryClass = threadFactoryClass;
             this.nearbyDistanceMeterClass = nearbyDistanceMeterClass;
+            this.random = random;
             this.initializingScoreTrend = initializingScoreTrend;
             this.solutionDescriptor = solutionDescriptor;
             this.classInstanceCache = classInstanceCache;