Convert UntypedActor to AbstractActor #22308

akka-docs/rst/java/code/docs/cluster/StatsWorker.java

@@ -3,28 +3,25 @@ package docs.cluster;
 import java.util.HashMap;
 import java.util.Map;
 
-import akka.actor.UntypedActor;
+import akka.actor.AbstractActor;
 
 //#worker
-public class StatsWorker extends UntypedActor {
+public class StatsWorker extends AbstractActor {
 
   Map<String, Integer> cache = new HashMap<String, Integer>();
 
   @Override
-  public void onReceive(Object message) {
-    if (message instanceof String) {
-      String word = (String) message;
-      Integer length = cache.get(word);
-      if (length == null) {
-        length = word.length();
-        cache.put(word, length);
-      }
-      getSender().tell(length, getSelf());
-
-    } else {
-      unhandled(message);
-    }
+  public Receive createReceive() {
+    return receiveBuilder()
+      .match(String.class, word -> {
+        Integer length = cache.get(word);
+        if (length == null) {
+          length = word.length();
+          cache.put(word, length);
+        }
+        sender().tell(length, self());
+      })
+      .build();
   }
-
 }
 //#worker