refactor: ScoreDirector is no longer public

core/src/main/java/ai/timefold/solver/core/api/domain/common/Lookup.java

@@ -0,0 +1,32 @@
+package ai.timefold.solver.core.api.domain.common;
+
+import ai.timefold.solver.core.api.solver.change.ProblemChange;
+import ai.timefold.solver.core.preview.api.move.Move;
+
+import org.jspecify.annotations.Nullable;
+
+/**
+ * Allows to transfer an entity or fact instance (often from another {@link Thread})
+ * to another working solution.
+ */
+public interface Lookup {
+
+    /**
+     * Translates an entity or fact instance (often from another {@link Thread})
+     * to another working solution.
+     * Useful for {@link Move#rebase(Lookup) move rebasing}
+     * and in a {@link ProblemChange} and for multi-threaded solving.
+     * <p>
+     * Matching uses {@link PlanningId}.
+     *
+     * @param problemFactOrPlanningEntity The fact or entity to rebase.
+     * @return null if problemFactOrPlanningEntity is null
+     * @throws IllegalArgumentException if there is no working object for the fact or entity,
+     *         if it cannot be looked up,
+     *         or if its class is not supported.
+     * @throws IllegalStateException if it cannot be looked up
+     * @param <T> the object type
+     */
+    <T> @Nullable T lookUpWorkingObject(@Nullable T problemFactOrPlanningEntity);
+
+}

core/src/main/java/ai/timefold/solver/core/api/domain/common/PlanningId.java

@@ -10,13 +10,12 @@
 import ai.timefold.solver.core.api.domain.entity.PlanningEntity;
 import ai.timefold.solver.core.api.domain.solution.ProblemFactCollectionProperty;
 import ai.timefold.solver.core.api.domain.valuerange.ValueRangeProvider;
-import ai.timefold.solver.core.api.score.director.ScoreDirector;
 import ai.timefold.solver.core.api.solver.change.ProblemChange;
 import ai.timefold.solver.core.preview.api.move.Move;
 
 /**
  * Specifies that a bean property (or a field) is the id to match
- * when {@link ScoreDirector#lookUpWorkingObject(Object) locating}
+ * when {@link Lookup#lookUpWorkingObject(Object) looking up}
  * an externalObject (often from another {@link Thread} or JVM).
  * Used during {@link Move} rebasing and in a {@link ProblemChange}.
  * <p>

core/src/main/java/ai/timefold/solver/core/api/domain/solution/PlanningEntityCollectionProperty.java

@@ -12,13 +12,12 @@
 import java.util.SortedSet;
 
 import ai.timefold.solver.core.api.domain.entity.PlanningEntity;
-import ai.timefold.solver.core.api.score.director.ScoreDirector;
 
 /**
  * Specifies that a property (or a field) on a {@link PlanningSolution} class is a {@link Collection} of planning entities.
  * <p>
  * Every element in the planning entity collection should have the {@link PlanningEntity} annotation.
- * Every element in the planning entity collection will be added to the {@link ScoreDirector}.
+ * Every element in the planning entity collection will be registered with the solver.
  * <p>
  * For solver reproducibility, the collection must have a deterministic, stable iteration order.
  * It is recommended to use a {@link List}, {@link LinkedHashSet} or {@link SortedSet}.

core/src/main/java/ai/timefold/solver/core/api/domain/solution/PlanningEntityProperty.java

@@ -8,13 +8,12 @@
 import java.lang.annotation.Target;
 
 import ai.timefold.solver.core.api.domain.entity.PlanningEntity;
-import ai.timefold.solver.core.api.score.director.ScoreDirector;
 
 /**
  * Specifies that a property (or a field) on a {@link PlanningSolution} class is a planning entity.
  * <p>
  * The planning entity should have the {@link PlanningEntity} annotation.
- * The planning entity will be added to the {@link ScoreDirector}.
+ * The planning entity will be registered with the solver.
  */
 @Target({ METHOD, FIELD })
 @Retention(RUNTIME)

core/src/main/java/ai/timefold/solver/core/api/solver/change/ProblemChangeDirector.java

@@ -1,16 +1,14 @@
 package ai.timefold.solver.core.api.solver.change;
 
-import java.util.Optional;
 import java.util.function.Consumer;
 
-import ai.timefold.solver.core.api.domain.common.PlanningId;
+import ai.timefold.solver.core.api.domain.common.Lookup;
 import ai.timefold.solver.core.api.domain.entity.PlanningEntity;
 import ai.timefold.solver.core.api.domain.solution.PlanningSolution;
 import ai.timefold.solver.core.api.domain.variable.PlanningVariable;
 import ai.timefold.solver.core.api.domain.variable.ShadowVariable;
 
 import org.jspecify.annotations.NullMarked;
-import org.jspecify.annotations.Nullable;
 
 /**
  * Allows external changes to the {@link PlanningSolution working solution}. If the changes are not applied through
@@ -19,9 +17,12 @@
  * never notified about them, resulting to inconsistencies in the {@link PlanningSolution working solution}.
  * Should be used only from a {@link ProblemChange} implementation.
  * To see an example implementation, please refer to the {@link ProblemChange} Javadoc.
+ *
+ * @see Lookup You may need to perform lookups of working objects from external objects.
  */
 @NullMarked
-public interface ProblemChangeDirector {
+public interface ProblemChangeDirector
+        extends Lookup {
 
     /**
      * Add a new {@link PlanningEntity} instance into the {@link PlanningSolution working solution}.
@@ -35,7 +36,7 @@ public interface ProblemChangeDirector {
     /**
      * Remove an existing {@link PlanningEntity} instance from the {@link PlanningSolution working solution}.
      * Translates the entity to a working planning entity by performing a lookup as defined by
-     * {@link #lookUpWorkingObjectOrFail(Object)}.
+     * {@link #lookUpWorkingObject(Object)}.
      *
      * @param entity the {@link PlanningEntity} instance
      * @param entityConsumer removes the working entity from the {@link PlanningSolution working solution}
@@ -45,7 +46,7 @@ public interface ProblemChangeDirector {
 
     /**
      * Change a {@link PlanningVariable} value of a {@link PlanningEntity}. Translates the entity to a working
-     * planning entity by performing a lookup as defined by {@link #lookUpWorkingObjectOrFail(Object)}.
+     * planning entity by performing a lookup as defined by {@link #lookUpWorkingObject(Object)}.
      *
      * @param entity the {@link PlanningEntity} instance
      * @param variableName name of the {@link PlanningVariable}
@@ -66,7 +67,7 @@ public interface ProblemChangeDirector {
 
     /**
      * Remove an existing problem fact from the {@link PlanningSolution working solution}. Translates the problem fact
-     * to a working problem fact by performing a lookup as defined by {@link #lookUpWorkingObjectOrFail(Object)}.
+     * to a working problem fact by performing a lookup as defined by {@link #lookUpWorkingObject(Object)}.
      *
      * @param problemFact the problem fact instance
      * @param problemFactConsumer removes the working problem fact from the
@@ -78,7 +79,7 @@ public interface ProblemChangeDirector {
     /**
      * Change a property of either a {@link PlanningEntity} or a problem fact. Translates the entity or the problem fact
      * to its {@link PlanningSolution working solution} counterpart by performing a lookup as defined by
-     * {@link #lookUpWorkingObjectOrFail(Object)}.
+     * {@link #lookUpWorkingObject(Object)}.
      *
      * @param problemFactOrEntity the {@link PlanningEntity} or the problem fact instance
      * @param problemFactOrEntityConsumer updates the property of the {@link PlanningEntity}
@@ -88,32 +89,6 @@ public interface ProblemChangeDirector {
     <EntityOrProblemFact> void changeProblemProperty(EntityOrProblemFact problemFactOrEntity,
             Consumer<EntityOrProblemFact> problemFactOrEntityConsumer);
 
-    /**
-     * Translate an entity or fact instance (often from another {@link Thread} or JVM)
-     * to this {@link ProblemChangeDirector}'s internal working instance.
-     * <p>
-     * Matching uses {@link PlanningId}.
-     *
-     * @return null if externalObject is null
-     * @throws IllegalArgumentException if there is no workingObject for externalObject, if it cannot be looked up
-     *         or if the externalObject's class is not supported
-     * @throws IllegalStateException if it cannot be looked up
-     * @param <EntityOrProblemFact> the object type
-     */
-    <EntityOrProblemFact> @Nullable EntityOrProblemFact lookUpWorkingObjectOrFail(@Nullable EntityOrProblemFact externalObject);
-
-    /**
-     * As defined by {@link #lookUpWorkingObjectOrFail(Object)},
-     * but doesn't fail fast if no workingObject was ever added for the externalObject.
-     * It's recommended to use {@link #lookUpWorkingObjectOrFail(Object)} instead.
-     *
-     * @return {@link Optional#empty()} if there is no workingObject for externalObject, or if externalObject is null
-     * @throws IllegalArgumentException if it cannot be looked up or if the externalObject's class is not supported
-     * @throws IllegalStateException if it cannot be looked up
-     * @param <EntityOrProblemFact> the object type
-     */
-    <EntityOrProblemFact> Optional<EntityOrProblemFact> lookUpWorkingObject(@Nullable EntityOrProblemFact externalObject);
-
     /**
      * Calls variable listeners on the external changes submitted so far.
      *

core/src/main/java/ai/timefold/solver/core/api/solver/phase/PhaseCommand.java

@@ -1,46 +1,34 @@
 package ai.timefold.solver.core.api.solver.phase;
 
-import java.util.function.BooleanSupplier;
-
 import ai.timefold.solver.core.api.domain.solution.PlanningSolution;
-import ai.timefold.solver.core.api.score.Score;
-import ai.timefold.solver.core.api.score.director.ScoreDirector;
 import ai.timefold.solver.core.api.solver.Solver;
 import ai.timefold.solver.core.api.solver.change.ProblemChange;
 import ai.timefold.solver.core.impl.phase.Phase;
-import ai.timefold.solver.core.impl.score.director.InnerScoreDirector;
+import ai.timefold.solver.core.preview.api.move.Move;
 
 import org.jspecify.annotations.NullMarked;
 
 /**
  * Runs a custom algorithm as a {@link Phase} of the {@link Solver} that changes the planning variables.
- * To change problem facts, use {@link Solver#addProblemChange(ProblemChange)} instead.
- * <p>
- * To add custom properties, configure custom properties and add public setters for them.
+ * To change problem facts and to add or remove entities, use {@link Solver#addProblemChange(ProblemChange)} instead.
  *
  * @param <Solution_> the solution type, the class with the {@link PlanningSolution} annotation
  */
 @NullMarked
 public interface PhaseCommand<Solution_> {
 
     /**
-     * Changes {@link PlanningSolution working solution} of {@link ScoreDirector#getWorkingSolution()}.
-     * When the {@link PlanningSolution working solution} is modified,
-     * the {@link ScoreDirector} must be correctly notified
-     * (through {@link ScoreDirector#beforeVariableChanged(Object, String)} and
-     * {@link ScoreDirector#afterVariableChanged(Object, String)}),
-     * otherwise calculated {@link Score}s will be corrupted.
+     * Changes the current {@link PhaseCommandContext#getWorkingSolution() working solution}.
+     * The solver is notified of the changes through {@link PhaseCommandContext},
+     * specifically through {@link PhaseCommandContext#executeAndCalculateScore(Move)}.
+     * Any other modifications to the working solution are strictly forbidden
+     * and will likely cause the solver to be in an inconsistent state and throw an exception later on.
      * <p>
-     * Don't forget to call {@link ScoreDirector#triggerVariableListeners()} after each set of changes
-     * (especially before every {@link InnerScoreDirector#calculateScore()} call)
-     * to ensure all shadow variables are updated.
+     * Don't forget to check {@link PhaseCommandContext#isPhaseTerminated() termination status} frequently
+     * to allow the solver to gracefully terminate when necessary.
      *
-     * @param scoreDirector the {@link ScoreDirector} that needs to get notified of the changes.
-     * @param isPhaseTerminated long-running command implementations should check this periodically
-     *        and terminate early if it returns true.
-     *        Otherwise the terminations configured by the user will have no effect,
-     *        as the solver can only terminate itself when a command has ended.
+     * @param context the context of the command, providing access to the working solution and allowing move execution
      */
-    void changeWorkingSolution(ScoreDirector<Solution_> scoreDirector, BooleanSupplier isPhaseTerminated);
+    void changeWorkingSolution(PhaseCommandContext<Solution_> context);
 
 }