Cache Invalidation: Reverted registration contract

  - Autowired contract does not work for cache listeners, since it forms
    loop which spring can not handle.

repo/repo-cache/src/main/java/com/evolveum/midpoint/repo/cache/registry/CacheRegistryImpl.java

@@ -30,13 +30,23 @@
  * be moved to a more appropriate place.
  */
 @Component("cacheRegistry")
-public class CacheRegistryImpl implements CacheRegistry {
+public class CacheRegistryImpl implements CacheListener, CacheRegistry {
 
     private final List<Cache> caches = new ArrayList<>();
 
     @Autowired private CacheDispatcher dispatcher;
     @Autowired private PrismContext prismContext;
 
+    @PostConstruct
+    public void registerListener() {
+        dispatcher.registerCacheListener(this);
+    }
+
+    @PreDestroy
+    public void unregisterListener() {
+        dispatcher.unregisterCacheListener(this);
+    }
+
     @Override
     public synchronized void registerCache(Cache cache) {
         if (!caches.contains(cache)) {
@@ -49,6 +59,16 @@ public synchronized void unregisterCache(Cache cache) {
         caches.remove(cache);
     }
 
+    @Override
+    public <O extends ObjectType> void invalidate(Class<O> type, String oid, boolean clusterwide,
+            CacheInvalidationContext context) {
+        // We currently ignore clusterwide parameter, because it's used by ClusterCacheListener only.
+        // So we assume that the invalidation event - from this point on - is propagated only locally.
+        for (Cache cache : caches) {
+            cache.invalidate(type, oid, context);
+        }
+    }
+
     @Override
     public CachesStateInformationType getStateInformation() {
         CachesStateInformationType rv = new CachesStateInformationType(prismContext);