Introduce TriConsumer interface modeled after the java.util.function.Consumer interface that accepts 3 arguments.

apache-geode-extensions/src/main/java/org/springframework/geode/util/function/TriConsumer.java

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+/*
+ * 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.Objects;
+import java.util.function.Consumer;
+
+/**
+ * {@link Consumer} like interface accepting 3 arguments.
+ *
+ * @author John Blum
+ * @see java.util.function.Consumer
+ * @since 1.3.0
+ */
+@FunctionalInterface
+public interface TriConsumer<T, U, V> {
+
+	/**
+	 * Performs a given operation on the 3 arguments.
+	 *
+	 * @param t first {@link Object argument}.
+	 * @param u second {@link Object argument}.
+	 * @param v third {@link Object argument}.
+	 */
+	void accept(T t, U u, V v);
+
+	/**
+	 * Composes this {@link TriConsumer} with the given {@link TriConsumer} after this {@link TriConsumer}.
+	 *
+	 * @param after {@link TriConsumer} to composed with this {@link TriConsumer}; must not be {@literal null}.
+	 * @return a new {@link TriConsumer} with the given {@link TriConsumer} composed after this {@link TriConsumer}.
+	 * @throws NullPointerException if {@link TriConsumer} is {@literal null}.
+	 */
+	default TriConsumer<T, U, V> andThen(TriConsumer<T, U, V> after) {
+
+		Objects.requireNonNull(after);
+
+		return (t, u, v) -> {
+			accept(t, u, v);
+			after.accept(t, u, v);
+		};
+	}
+}

apache-geode-extensions/src/test/java/org/springframework/geode/util/function/TriConsumerUnitTests.java

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+/*
+ * 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 org.junit.Test;
+import org.mockito.InOrder;
+
+/**
+ * Unit Tests for {@link TriConsumer}.
+ *
+ * @author John Blum
+ * @see org.junit.Test
+ * @see org.mockito.Mockito
+ * @see org.springframework.geode.util.function.TriConsumer
+ * @since 1.3.0
+ */
+public class TriConsumerUnitTests {
+
+	@Test
+	@SuppressWarnings({ "rawtypes", "unchecked" })
+	public void andThenComposesTriConsumers() {
+
+		TriConsumer consumerOne = mock(TriConsumer.class);
+		TriConsumer consumerTwo = mock(TriConsumer.class);
+
+		doCallRealMethod().when(consumerOne).andThen(any(TriConsumer.class));
+
+		TriConsumer composedConsumer = consumerOne.andThen(consumerTwo);
+
+		assertThat(composedConsumer).isNotNull();
+		assertThat(composedConsumer).isNotSameAs(consumerOne);
+		assertThat(composedConsumer).isNotSameAs(consumerTwo);
+
+		composedConsumer.accept("one", "two", "three");
+
+		InOrder order = inOrder(consumerOne, consumerTwo);
+
+		order.verify(consumerOne, times(1))
+			.accept(eq("one"), eq("two"), eq("three"));
+		order.verify(consumerTwo, times(1))
+			.accept(eq("one"), eq("two"), eq("three"));
+	}
+
+	@Test(expected = NullPointerException.class)
+	@SuppressWarnings({ "rawtypes", "unchecked" })
+	public void andThenWithNull() {
+
+		TriConsumer consumer = mock(TriConsumer.class);
+
+		doCallRealMethod().when(consumer).andThen(any());
+
+		consumer.andThen(null);
+	}
+}