Merge pull request #22569 from bono007

* pr/22569:
  Polish "Add support for selecting the Redis client to use"
  Add support for selecting the Redis client to use

Closes gh-22569

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/redis/JedisConnectionConfiguration.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -26,6 +26,7 @@ import redis.clients.jedis.JedisPoolConfig;
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.data.redis.connection.RedisClusterConfiguration;
@@ -45,6 +46,8 @@ import org.springframework.util.StringUtils;
  */
 @Configuration(proxyBeanMethods = false)
 @ConditionalOnClass({ GenericObjectPool.class, JedisConnection.class, Jedis.class })
+@ConditionalOnMissingBean(RedisConnectionFactory.class)
+@ConditionalOnProperty(name = "spring.redis.client-type", havingValue = "jedis", matchIfMissing = true)
 class JedisConnectionConfiguration extends RedisConnectionConfiguration {
 
 	JedisConnectionConfiguration(RedisProperties properties,
@@ -54,7 +57,6 @@ class JedisConnectionConfiguration extends RedisConnectionConfiguration {
 	}
 
 	@Bean
-	@ConditionalOnMissingBean(RedisConnectionFactory.class)
 	JedisConnectionFactory redisConnectionFactory(
 			ObjectProvider<JedisClientConfigurationBuilderCustomizer> builderCustomizers) throws UnknownHostException {
 		return createJedisConnectionFactory(builderCustomizers);

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/redis/LettuceConnectionConfiguration.java

@@ -31,6 +31,7 @@ import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.data.redis.RedisProperties.Lettuce.Cluster.Refresh;
 import org.springframework.boot.autoconfigure.data.redis.RedisProperties.Pool;
 import org.springframework.context.annotation.Bean;
@@ -52,6 +53,7 @@ import org.springframework.util.StringUtils;
  */
 @Configuration(proxyBeanMethods = false)
 @ConditionalOnClass(RedisClient.class)
+@ConditionalOnProperty(name = "spring.redis.client-type", havingValue = "lettuce", matchIfMissing = true)
 class LettuceConnectionConfiguration extends RedisConnectionConfiguration {
 
 	LettuceConnectionConfiguration(RedisProperties properties,

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/redis/RedisAutoConfiguration.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -21,6 +21,7 @@ import java.net.UnknownHostException;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnSingleCandidate;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -52,6 +53,7 @@ public class RedisAutoConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean(name = "redisTemplate")
+	@ConditionalOnSingleCandidate(RedisConnectionFactory.class)
 	public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory)
 			throws UnknownHostException {
 		RedisTemplate<Object, Object> template = new RedisTemplate<>();
@@ -61,6 +63,7 @@ public class RedisAutoConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean
+	@ConditionalOnSingleCandidate(RedisConnectionFactory.class)
 	public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory redisConnectionFactory)
 			throws UnknownHostException {
 		StringRedisTemplate template = new StringRedisTemplate();

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/redis/RedisProperties.java

@@ -76,6 +76,11 @@ public class RedisProperties {
 	 */
 	private String clientName;
 
+	/**
+	 * Type of client to use. By default, auto-detected according to the classpath.
+	 */
+	private ClientType clientType;
+
 	private Sentinel sentinel;
 
 	private Cluster cluster;
@@ -148,6 +153,14 @@ public class RedisProperties {
 		this.clientName = clientName;
 	}
 
+	public ClientType getClientType() {
+		return this.clientType;
+	}
+
+	public void setClientType(ClientType clientType) {
+		this.clientType = clientType;
+	}
+
 	public Sentinel getSentinel() {
 		return this.sentinel;
 	}
@@ -172,6 +185,23 @@ public class RedisProperties {
 		return this.lettuce;
 	}
 
+	/**
+	 * Type of Redis client to use.
+	 */
+	public enum ClientType {
+
+		/**
+		 * Use the Lettuce redis client.
+		 */
+		LETTUCE,
+
+		/**
+		 * Use the Jedis redis client.
+		 */
+		JEDIS
+
+	}
+
 	/**
 	 * Pool properties.
 	 */

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/redis/RedisAutoConfigurationJedisTests.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -25,6 +25,7 @@ import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.boot.testsupport.classpath.ClassPathExclusions;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
 import org.springframework.data.redis.connection.jedis.JedisClientConfiguration.JedisClientConfigurationBuilder;
 import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
 
@@ -42,6 +43,18 @@ class RedisAutoConfigurationJedisTests {
 	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
 			.withConfiguration(AutoConfigurations.of(RedisAutoConfiguration.class));
 
+	@Test
+	void connectionFactoryDefaultsToJedis() {
+		this.contextRunner.run((context) -> assertThat(context.getBean("redisConnectionFactory"))
+				.isInstanceOf(JedisConnectionFactory.class));
+	}
+
+	@Test
+	void connectionFactoryIsNotCreatedWhenLettuceIsSelected() {
+		this.contextRunner.withPropertyValues("spring.redis.client-type=lettuce")
+				.run((context) -> assertThat(context).doesNotHaveBean(RedisConnectionFactory.class));
+	}
+
 	@Test
 	void testOverrideRedisConfiguration() {
 		this.contextRunner.withPropertyValues("spring.redis.host:foo", "spring.redis.database:1").run((context) -> {

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/redis/RedisAutoConfigurationTests.java

@@ -37,8 +37,10 @@ import org.springframework.boot.test.context.runner.ContextConsumer;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.data.redis.connection.RedisClusterConfiguration;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
 import org.springframework.data.redis.connection.RedisNode;
 import org.springframework.data.redis.connection.RedisSentinelConfiguration;
+import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
 import org.springframework.data.redis.connection.lettuce.LettuceClientConfiguration;
 import org.springframework.data.redis.connection.lettuce.LettuceClientConfiguration.LettuceClientConfigurationBuilder;
 import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
@@ -72,8 +74,10 @@ class RedisAutoConfigurationTests {
 	@Test
 	void testDefaultRedisConfiguration() {
 		this.contextRunner.run((context) -> {
-			assertThat(context.getBean("redisTemplate", RedisOperations.class)).isNotNull();
-			assertThat(context.getBean(StringRedisTemplate.class)).isNotNull();
+			assertThat(context.getBean("redisTemplate")).isInstanceOf(RedisOperations.class);
+			assertThat(context).hasSingleBean(StringRedisTemplate.class);
+			assertThat(context).hasSingleBean(RedisConnectionFactory.class);
+			assertThat(context.getBean(RedisConnectionFactory.class)).isInstanceOf(LettuceConnectionFactory.class);
 		});
 	}
 
@@ -182,6 +186,22 @@ class RedisAutoConfigurationTests {
 				});
 	}
 
+	@Test
+	void connectionFactoryWithJedisClientType() {
+		this.contextRunner.withPropertyValues("spring.redis.client-type:jedis").run((context) -> {
+			assertThat(context).hasSingleBean(RedisConnectionFactory.class);
+			assertThat(context.getBean(RedisConnectionFactory.class)).isInstanceOf(JedisConnectionFactory.class);
+		});
+	}
+
+	@Test
+	void connectionFactoryWithLettuceClientType() {
+		this.contextRunner.withPropertyValues("spring.redis.client-type:lettuce").run((context) -> {
+			assertThat(context).hasSingleBean(RedisConnectionFactory.class);
+			assertThat(context.getBean(RedisConnectionFactory.class)).isInstanceOf(LettuceConnectionFactory.class);
+		});
+	}
+
 	@Test
 	void testRedisConfigurationWithSentinel() {
 		List<String> sentinels = Arrays.asList("127.0.0.1:26379", "127.0.0.1:26380");