Add example for mapError (#29913)

2021-01-13 12:35:47 +05:30 · 2021-01-13 12:35:47 +05:30 · 8361b2a1b9
commit 8361b2a1b9
parent 294661bde1
3 changed files with 82 additions and 0 deletions
--- a/akka-docs/src/test/java/jdocs/stream/operators/sourceorflow/MapError.java
+++ b/akka-docs/src/test/java/jdocs/stream/operators/sourceorflow/MapError.java
@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019-2020 Lightbend Inc. <https://www.lightbend.com>
+ */
+
+package jdocs.stream.operators.sourceorflow;
+
+import akka.actor.ActorSystem;
+import akka.stream.javadsl.Sink;
+import akka.stream.javadsl.Source;
+
+import java.util.Arrays;
+
+public class MapError {
+
+  public static void main(String[] args) {
+
+    // #map-error
+
+    final ActorSystem system = ActorSystem.create("mapError-operator-example");
+    Source.from(Arrays.asList(-1, 0, 1))
+        .map(x -> 1 / x)
+        .mapError(
+            ArithmeticException.class,
+            (ArithmeticException e) ->
+                new UnsupportedOperationException("Divide by Zero Operation is not supported."))
+        .runWith(Sink.seq(), system)
+        .whenComplete(
+            (result, exception) -> {
+              if (result != null) System.out.println(result.toString());
+              else System.out.println(exception.getMessage());
+            });
+
+    // prints "Divide by Zero Operation is not supported."
+    // #map-error
+  }
+}