BAEL-3091: The Prototype Pattern in Java (changed code based on valid comments from a reader)

libraries/src/main/java/com/baeldung/jdeffered/PipeDemo.java

@@ -0,0 +1,32 @@
+package com.baeldung.jdeffered;
+
+import org.jdeferred.Deferred;
+import org.jdeferred.DonePipe;
+import org.jdeferred.Promise;
+import org.jdeferred.impl.DeferredObject;
+
+class PipeDemo {
+
+    public enum Result {
+        SUCCESS, FAILURE
+    };
+
+    private static Result status;
+
+    static Result validate(int num) {
+        Deferred<Integer, ?, ?> d = new DeferredObject<>();
+        Promise<Integer, ?, ?> p = d.promise();
+
+        p.then((DonePipe<Integer, Integer, Exception, Void>) result -> {
+            if (result < 90) {
+                return new DeferredObject<Integer, Exception, Void>().resolve(result);
+            } else {
+                return new DeferredObject<Integer, Exception, Void>().reject(new Exception("Unacceptable value"));
+            }
+        }).done(r -> status = Result.SUCCESS).fail(r -> status = Result.FAILURE);
+
+        d.resolve(num);
+
+        return status;
+    }
+}