Add requireState(..) assertion method to RedisAssertions.

Use RedisAssertions.requireState(..) in RedisAccessor.getRequiredConnectionFactory().

Closes #2611

src/main/java/org/springframework/data/redis/core/RedisAccessor.java

@@ -19,9 +19,8 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.springframework.beans.factory.InitializingBean;
 import org.springframework.data.redis.connection.RedisConnectionFactory;
-import org.springframework.lang.NonNull;
+import org.springframework.data.redis.util.RedisAssertions;
 import org.springframework.lang.Nullable;
-import org.springframework.util.Assert;
 
 /**
  * Base class for {@link RedisTemplate} defining common properties. Not intended to be used directly.
@@ -62,14 +61,8 @@ public class RedisAccessor implements InitializingBean {
 	 * @see #getConnectionFactory()
 	 * @since 2.0
 	 */
-	@NonNull
 	public RedisConnectionFactory getRequiredConnectionFactory() {
-
-		RedisConnectionFactory connectionFactory = getConnectionFactory();
-
-		Assert.state(connectionFactory != null, "RedisConnectionFactory is required");
-
-		return connectionFactory;
+		return RedisAssertions.requireState(getConnectionFactory(), "RedisConnectionFactory is required");
 	}
 
 	/**

src/main/java/org/springframework/data/redis/util/RedisAssertions.java

@@ -56,4 +56,33 @@ public abstract class RedisAssertions {
 		Assert.notNull(target, message);
 		return target;
 	}
+
+	/**
+	 * Asserts the given {@link Object} is not {@literal null}.
+	 *
+	 * @param <T> {@link Class type} of {@link Object} being asserted.
+	 * @param target {@link Object} to evaluate.
+	 * @param message {@link String} containing the message for the thrown exception.
+	 * @param arguments array of {@link Object} arguments used to format the {@link String message}.
+	 * @return the given {@link Object}.
+	 * @throws IllegalArgumentException if the {@link Object target} is {@literal null}.
+	 * @see #requireObject(Object, Supplier)
+	 */
+	public static <T> T requireState(@Nullable T target, String message, Object... arguments) {
+		return requireState(target, () -> String.format(message, arguments));
+	}
+
+	/**
+	 * Asserts the given {@link Object} is not {@literal null}.
+	 *
+	 * @param <T> {@link Class type} of {@link Object} being asserted.
+	 * @param target {@link Object} to evaluate.
+	 * @param message {@link Supplier} supplying the message for the thrown exception.
+	 * @return the given {@link Object}.
+	 * @throws IllegalArgumentException if the {@link Object target} is {@literal null}.
+	 */
+	public static <T> T requireState(@Nullable T target, Supplier<String> message) {
+		Assert.state(target != null, message);
+		return target;
+	}
 }

src/test/java/org/springframework/data/redis/core/RedisAccessorUnitTests.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2017-2023 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.data.redis.core;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoInteractions;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.data.redis.connection.RedisConnectionFactory;
+
+/**
+ * Unit Tests for {@link RedisAccessor}.
+ *
+ * @author John Blum
+ * @see org.junit.jupiter.api.Test
+ * @see org.springframework.data.redis.core.RedisAccessor
+ * @since 3.2.0
+ */
+public class RedisAccessorUnitTests {
+
+	@Test
+	public void setAndGetConnectionFactory() {
+
+		RedisConnectionFactory mockConnectionFactory = mock(RedisConnectionFactory.class);
+
+		RedisAccessor redisAccessor = new RedisAccessor();
+
+		assertThat(redisAccessor.getConnectionFactory()).isNull();
+
+		redisAccessor.setConnectionFactory(mockConnectionFactory);
+
+		assertThat(redisAccessor.getConnectionFactory()).isSameAs(mockConnectionFactory);
+		assertThat(redisAccessor.getRequiredConnectionFactory()).isSameAs(mockConnectionFactory);
+
+		redisAccessor.setConnectionFactory(null);
+
+		assertThat(redisAccessor.getConnectionFactory()).isNull();
+
+		verifyNoInteractions(mockConnectionFactory);
+	}
+
+	@Test
+	public void getRequiredConnectionFactoryWhenNull() {
+
+		assertThatIllegalStateException()
+			.isThrownBy(() -> new RedisAccessor().getRequiredConnectionFactory())
+			.withMessage("RedisConnectionFactory is required")
+			.withNoCause();
+	}
+
+	@Test
+	public void afterPropertiesSetCallsGetRequiredConnectionFactory() {
+
+		RedisConnectionFactory mockConnectionFactory = mock(RedisConnectionFactory.class);
+
+		RedisAccessor redisAccessor = spy(new RedisAccessor());
+
+		doReturn(mockConnectionFactory).when(redisAccessor).getRequiredConnectionFactory();
+
+		redisAccessor.afterPropertiesSet();
+
+		verify(redisAccessor, times(1)).afterPropertiesSet();
+		verify(redisAccessor, times(1)).getRequiredConnectionFactory();
+		verifyNoMoreInteractions(redisAccessor);
+	}
+}

src/test/java/org/springframework/data/redis/util/RedisAssertionsUnitTests.java

@@ -17,6 +17,7 @@ package org.springframework.data.redis.util;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
+import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
@@ -79,4 +80,40 @@ public class RedisAssertionsUnitTests {
 		verify(this.mockSupplier, times(1)).get();
 		verifyNoMoreInteractions(this.mockSupplier);
 	}
+
+	@Test
+	public void requireStateWithMessageAndArgumentsIsSuccessful() {
+		assertThat(RedisAssertions.requireState("test", "Mock message")).isEqualTo("test");
+	}
+
+	@Test
+	public void requireStateWithMessageAndArgumentsThrowsIllegalStateException() {
+
+		assertThatIllegalStateException()
+			.isThrownBy(() -> RedisAssertions.requireState(null, "This is a %s", "test"))
+			.withMessage("This is a test")
+			.withNoCause();
+	}
+
+	@Test
+	public void requireStateWithSupplierIsSuccessful() {
+
+		assertThat(RedisAssertions.requireState("test", this.mockSupplier)).isEqualTo("test");
+
+		verifyNoInteractions(this.mockSupplier);
+	}
+
+	@Test
+	public void requiredStateWithSupplierThrowsIllegalStateException() {
+
+		doReturn("Mock message").when(this.mockSupplier).get();
+
+		assertThatIllegalStateException()
+			.isThrownBy(() -> RedisAssertions.requireState(null, this.mockSupplier))
+			.withMessage("Mock message")
+			.withNoCause();
+
+		verify(this.mockSupplier, times(1)).get();
+		verifyNoMoreInteractions(this.mockSupplier);
+	}
 }