Add auto-configuration for reactive Redis

This commit provides an auto-configuration for reactive Redis and a
starter that provides Lettuce as Jedis doesn't support reactive
operations.

There are no support for reactive redis repositories at the moment so
only a `ReactiveRedisTemplate` is auto-configured if necessary.

Closes gh-8053

Author: snicoll

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

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2012-2017 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
+ *
+ *      http://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.boot.autoconfigure.data.redis;
+
+import reactor.core.publisher.Flux;
+
+import org.springframework.boot.autoconfigure.AutoConfigureAfter;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.ResourceLoader;
+import org.springframework.data.redis.connection.ReactiveRedisConnectionFactory;
+import org.springframework.data.redis.core.ReactiveRedisTemplate;
+import org.springframework.data.redis.serializer.JdkSerializationRedisSerializer;
+import org.springframework.data.redis.serializer.RedisSerializationContext;
+
+/**
+ * {@link EnableAutoConfiguration Auto-configuration} for Spring Data's reactive Redis
+ * support.
+ *
+ * @author Mark Paluch
+ * @author Stephane Nicoll
+ * @since 2.0.0
+ */
+@Configuration
+@ConditionalOnClass({ ReactiveRedisConnectionFactory.class, ReactiveRedisTemplate.class,
+		Flux.class })
+@AutoConfigureAfter(RedisAutoConfiguration.class)
+public class RedisReactiveAutoConfiguration {
+
+	@Bean
+	@ConditionalOnMissingBean(name = "reactiveRedisTemplate")
+	@ConditionalOnBean(ReactiveRedisConnectionFactory.class)
+	public ReactiveRedisTemplate<Object, Object> reactiveRedisTemplate(
+			ReactiveRedisConnectionFactory reactiveRedisConnectionFactory,
+			ResourceLoader resourceLoader) {
+
+		JdkSerializationRedisSerializer jdkSerializer =
+				new JdkSerializationRedisSerializer(resourceLoader.getClassLoader());
+
+		RedisSerializationContext<Object, Object> serializationContext =
+				RedisSerializationContext.newSerializationContext()
+						.key(jdkSerializer)
+						.value(jdkSerializer)
+						.hashKey(jdkSerializer)
+						.hashValue(jdkSerializer).build();
+		return new ReactiveRedisTemplate<>(reactiveRedisConnectionFactory,
+				serializationContext);
+	}
+
+}

spring-boot-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -49,6 +49,7 @@ org.springframework.boot.autoconfigure.data.neo4j.Neo4jDataAutoConfiguration,\
 org.springframework.boot.autoconfigure.data.neo4j.Neo4jRepositoriesAutoConfiguration,\
 org.springframework.boot.autoconfigure.data.solr.SolrRepositoriesAutoConfiguration,\
 org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration,\
+org.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfiguration,\
 org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration,\
 org.springframework.boot.autoconfigure.data.rest.RepositoryRestMvcAutoConfiguration,\
 org.springframework.boot.autoconfigure.data.web.SpringDataWebAutoConfiguration,\

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

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2012-2017 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
+ *
+ *      http://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.boot.autoconfigure.data.redis;
+
+import java.util.Map;
+
+import org.junit.After;
+import org.junit.Test;
+
+import org.springframework.boot.test.util.EnvironmentTestUtils;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.data.redis.core.ReactiveRedisTemplate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link RedisReactiveAutoConfiguration}.
+ *
+ * @author Stephane Nicoll
+ */
+public class RedisReactiveAutoConfigurationTests {
+
+	private AnnotationConfigApplicationContext context;
+
+	@After
+	public void close() {
+		if (this.context != null) {
+			this.context.close();
+		}
+	}
+
+	@Test
+	public void testDefaultRedisConfiguration() {
+		load();
+		Map<String, ReactiveRedisTemplate> beans = this.context.getBeansOfType(
+				ReactiveRedisTemplate.class);
+		assertThat(beans).containsOnlyKeys("reactiveRedisTemplate");
+	}
+
+
+	private void load(String... environment) {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		EnvironmentTestUtils.addEnvironment(ctx, environment);
+		ctx.register(RedisAutoConfiguration.class, RedisReactiveAutoConfiguration.class);
+		ctx.refresh();
+		this.context = ctx;
+	}
+
+}

spring-boot-dependencies/pom.xml

@@ -389,6 +389,11 @@
 				<artifactId>spring-boot-starter-data-redis</artifactId>
 				<version>2.0.0.BUILD-SNAPSHOT</version>
 			</dependency>
+			<dependency>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-starter-data-redis-reactive</artifactId>
+				<version>2.0.0.BUILD-SNAPSHOT</version>
+			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-data-neo4j</artifactId>

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -3264,9 +3264,12 @@ http://redis.io/[Redis] is a cache, message broker and richly-featured key-value
 Spring Boot offers basic auto-configuration for the
 https://github.com/xetorthio/jedis/[Jedis] and and https://github.com/mp911de/lettuce/[Lettuce]
 client library and abstractions on top of it provided by
-https://github.com/spring-projects/spring-data-redis[Spring Data Redis]. There
-is a `spring-boot-starter-data-redis` '`Starter`' for collecting the dependencies in a
-convenient way that uses https://github.com/xetorthio/jedis/[Jedis] by default.
+https://github.com/spring-projects/spring-data-redis[Spring Data Redis].
+
+There is a `spring-boot-starter-data-redis` '`Starter`' for collecting the dependencies in
+a convenient way that uses https://github.com/xetorthio/jedis/[Jedis] by default. If you
+are building a reactive application, the `spring-boot-starter-data-redis-reactive`
+'`Starter`' will get you going.
 
 
 

spring-boot-starters/pom.xml

@@ -38,6 +38,7 @@
 		<module>spring-boot-starter-data-mongodb-reactive</module>
 		<module>spring-boot-starter-data-neo4j</module>
 		<module>spring-boot-starter-data-redis</module>
+		<module>spring-boot-starter-data-redis-reactive</module>
 		<module>spring-boot-starter-data-rest</module>
 		<module>spring-boot-starter-data-solr</module>
 		<module>spring-boot-starter-freemarker</module>

spring-boot-starters/spring-boot-starter-data-redis-reactive/pom.xml

@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starters</artifactId>
+		<version>2.0.0.BUILD-SNAPSHOT</version>
+	</parent>
+	<artifactId>spring-boot-starter-data-redis-reactive</artifactId>
+	<name>Spring Boot Data Redis Reactive Starter</name>
+	<description>Starter for using Redis key-value data store with Spring Data Redis
+		reactive and the Lettuce client</description>
+	<url>http://projects.spring.io/spring-boot/</url>
+	<organization>
+		<name>Pivotal Software, Inc.</name>
+		<url>http://www.spring.io</url>
+	</organization>
+	<properties>
+		<main.basedir>${basedir}/../..</main.basedir>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.data</groupId>
+			<artifactId>spring-data-redis</artifactId>
+			<exclusions>
+				<exclusion>
+					<groupId>org.slf4j</groupId>
+					<artifactId>jcl-over-slf4j</artifactId>
+				</exclusion>
+			</exclusions>
+		</dependency>
+		<dependency>
+			<groupId>io.lettuce</groupId>
+			<artifactId>lettuce-core</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.commons</groupId>
+			<artifactId>commons-pool2</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>io.projectreactor</groupId>
+			<artifactId>reactor-core</artifactId>
+		</dependency>
+	</dependencies>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.basepom.maven</groupId>
+				<artifactId>duplicate-finder-maven-plugin</artifactId>
+				<executions>
+					<execution>
+						<id>duplicate-dependencies</id>
+						<phase>validate</phase>
+						<goals>
+							<goal>check</goal>
+						</goals>
+						<configuration>
+							<ignoredResourcePatterns>
+								<ignoredResourcePattern>changelog.txt</ignoredResourcePattern>
+							</ignoredResourcePatterns>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
+</project>

spring-boot-starters/spring-boot-starter-data-redis-reactive/src/main/resources/META-INF/spring.provides

@@ -0,0 +1 @@
+provides: spring-data-redis,lettuce-core