Bugfix: Prioritized Components Cache change detection got removed (#1698)

The commit c32b8c9 added discriminator
("owner class") to key, but by mistake dropped the change detection.

The original intent of that commit was to avoid hash clashes as
key did not factor in owner.

Also now this uses cache as intended.

Author: cstamas

maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/PrioritizedComponents.java

@@ -35,11 +35,12 @@
  */
 public final class PrioritizedComponents<T> {
     /**
-     * Reuses or creates and stores (if session data does not contain yet) prioritized components under certain key into
-     * given session. Same session is used to configure prioritized components, so priority sorted components during
-     * session are immutable and reusable.
+     * Reuses or creates and caches (if session is equipped with cache, and it does not contain it yet)
+     * prioritized components under certain key into session cache. Same session is used to configure prioritized
+     * components, so priority sorted components during session are immutable and reusable (if {@code components}
+     * component map is unchanged).
      * <p>
-     * The {@code components} are expected to be Sisu injected {@link Map<String, C>}-like component maps. There is a
+     * The {@code components} are expected to be Sisu injected {@link Map}-like dynamic component maps. There is a
      * simple "change detection" in place, as injected maps are dynamic, they are atomically expanded or contracted
      * as components are dynamically discovered or unloaded.
      *
@@ -53,10 +54,11 @@ public static <C> PrioritizedComponents<C> reuseOrCreate(
             Function<C, Float> priorityFunction) {
         boolean cached = ConfigUtils.getBoolean(
                 session, ConfigurationProperties.DEFAULT_CACHED_PRIORITIES, ConfigurationProperties.CACHED_PRIORITIES);
-        if (cached) {
-            String key = PrioritizedComponents.class.getName() + ".pc." + discriminator.getName();
-            return (PrioritizedComponents<C>)
-                    session.getData().computeIfAbsent(key, () -> create(session, components, priorityFunction));
+        if (cached && session.getCache() != null) {
+            String key = PrioritizedComponents.class.getName() + ".pc." + discriminator.getName()
+                    + Integer.toHexString(components.hashCode());
+            return (PrioritizedComponents<C>) session.getCache()
+                    .computeIfAbsent(session, key, () -> create(session, components, priorityFunction));
         } else {
             return create(session, components, priorityFunction);
         }