ActorContext.getParent for Java API #22413

akka-docs/rst/java/code/jdocs/cluster/FactorialBackend.java

@@ -0,0 +1,36 @@
+package jdocs.cluster;
+
+import java.math.BigInteger;
+import java.util.concurrent.CompletableFuture;
+
+import akka.actor.AbstractActor;
+import static akka.pattern.PatternsCS.pipe;
+
+//#backend
+public class FactorialBackend extends AbstractActor {
+
+  @Override
+  public Receive createReceive() {
+    return receiveBuilder()
+      .match(Integer.class, n -> {
+
+        CompletableFuture<FactorialResult> result =
+          CompletableFuture.supplyAsync(() -> factorial(n))
+            .thenApply((factorial) -> new FactorialResult(n, factorial));
+
+        pipe(result, getContext().dispatcher()).to(sender());
+
+      })
+      .build();
+  }
+
+  BigInteger factorial(int n) {
+    BigInteger acc = BigInteger.ONE;
+    for (int i = 1; i <= n; ++i) {
+      acc = acc.multiply(BigInteger.valueOf(i));
+    }
+    return acc;
+  }
+}
+//#backend
+