From 3770ff45691ccaed38464eb5c9e7832edf1d6035 Mon Sep 17 00:00:00 2001
From: John Blum <jblum@pivotal.io>
Date: Sun, 26 Apr 2020 15:33:48 -0700
Subject: [PATCH] Introduce TupleConsumer interface extending and implementing
 the java.util.function.Consumer interface accepting a variable number of
 arguments reprented by InvocationArguments.

---
 .../geode/util/function/TupleConsumer.java    | 31 ++++++++
 .../util/function/TupleConsumerUnitTests.java | 76 +++++++++++++++++++
 2 files changed, 107 insertions(+)
 create mode 100644 apache-geode-extensions/src/main/java/org/springframework/geode/util/function/TupleConsumer.java
 create mode 100644 apache-geode-extensions/src/test/java/org/springframework/geode/util/function/TupleConsumerUnitTests.java

diff --git a/apache-geode-extensions/src/main/java/org/springframework/geode/util/function/TupleConsumer.java b/apache-geode-extensions/src/main/java/org/springframework/geode/util/function/TupleConsumer.java
new file mode 100644
index 00000000..687c690b
--- /dev/null
+++ b/apache-geode-extensions/src/main/java/org/springframework/geode/util/function/TupleConsumer.java
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+package org.springframework.geode.util.function;
+
+import java.util.function.Consumer;
+
+/**
+ * {@link Consumer} implementation accepting a tuple of {@link InvocationArguments arguments}.
+ *
+ * @author John Blum
+ * @see java.util.function.Consumer
+ * @see org.springframework.geode.util.function.InvocationArguments
+ * @since 1.3.0
+ */
+@SuppressWarnings("unused")
+public interface TupleConsumer extends Consumer<InvocationArguments> {
+
+}
diff --git a/apache-geode-extensions/src/test/java/org/springframework/geode/util/function/TupleConsumerUnitTests.java b/apache-geode-extensions/src/test/java/org/springframework/geode/util/function/TupleConsumerUnitTests.java
new file mode 100644
index 00000000..81c7a1ab
--- /dev/null
+++ b/apache-geode-extensions/src/test/java/org/springframework/geode/util/function/TupleConsumerUnitTests.java
@@ -0,0 +1,76 @@
+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+package org.springframework.geode.util.function;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doCallRealMethod;
+import static org.mockito.Mockito.inOrder;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+
+import java.util.function.Consumer;
+
+import org.junit.Test;
+import org.mockito.InOrder;
+
+/**
+ * Unit Tests for {@link TupleConsumer}.
+ *
+ * @author John Blum
+ * @see java.util.function.Consumer
+ * @see org.junit.Test
+ * @see org.mockito.Mockito
+ * @see org.springframework.geode.util.function.TupleConsumer
+ * @since 1.3.0
+ */
+public class TupleConsumerUnitTests {
+
+	@Test
+	public void andThenComposesTupleConsumers() {
+
+		TupleConsumer consumerOne = mock(TupleConsumer.class);
+		TupleConsumer consumerTwo = mock(TupleConsumer.class);
+
+		doCallRealMethod().when(consumerOne).andThen(any(TupleConsumer.class));
+
+		Consumer<InvocationArguments> composedConsumer = consumerOne.andThen(consumerTwo);
+
+		assertThat(composedConsumer).isNotNull();
+		assertThat(composedConsumer).isNotSameAs(consumerOne);
+		assertThat(composedConsumer).isNotSameAs(consumerTwo);
+
+		InvocationArguments arguments = InvocationArguments.from("test", 1, true);
+
+		composedConsumer.accept(arguments);
+
+		InOrder order = inOrder(consumerOne, consumerTwo);
+
+		order.verify(consumerOne, times(1)).accept(eq(arguments));
+		order.verify(consumerTwo, times(1)).accept(eq(arguments));
+	}
+
+	@Test(expected = NullPointerException.class)
+	public void andThenWithNull() {
+
+		TupleConsumer consumer = mock(TupleConsumer.class);
+
+		doCallRealMethod().when(consumer).andThen(any());
+
+		consumer.andThen(null);
+	}
+}