Detect user-defined RedisCacheConfiguration

This commits improves the cache auto-configuration for Redis by looking
up a custom "RedisCacheConfiguration" bean that allows to take full
control over the `RedisCacheManager`.

Closes gh-11599

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cache/RedisCacheConfiguration.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -19,6 +19,7 @@ package org.springframework.boot.autoconfigure.cache;
 import java.util.LinkedHashSet;
 import java.util.List;
 
+import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.cache.CacheProperties.Redis;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
@@ -51,16 +52,20 @@ class RedisCacheConfiguration {
 
 	private final CacheManagerCustomizers customizerInvoker;
 
+	private final org.springframework.data.redis.cache.RedisCacheConfiguration redisCacheConfiguration;
+
 	RedisCacheConfiguration(CacheProperties cacheProperties,
-			CacheManagerCustomizers customizerInvoker) {
+			CacheManagerCustomizers customizerInvoker,
+			ObjectProvider<org.springframework.data.redis.cache.RedisCacheConfiguration> redisCacheConfiguration) {
 		this.cacheProperties = cacheProperties;
 		this.customizerInvoker = customizerInvoker;
+		this.redisCacheConfiguration = redisCacheConfiguration.getIfAvailable();
 	}
 
 	@Bean
 	public RedisCacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {
 		RedisCacheManagerBuilder builder = RedisCacheManager
-				.builder(redisConnectionFactory).cacheDefaults(getConfiguration());
+				.builder(redisConnectionFactory).cacheDefaults(determineConfiguration());
 		List<String> cacheNames = this.cacheProperties.getCacheNames();
 		if (!cacheNames.isEmpty()) {
 			builder.initialCacheNames(new LinkedHashSet<>(cacheNames));
@@ -68,7 +73,10 @@ class RedisCacheConfiguration {
 		return this.customizerInvoker.customize(builder.build());
 	}
 
-	private org.springframework.data.redis.cache.RedisCacheConfiguration getConfiguration() {
+	private org.springframework.data.redis.cache.RedisCacheConfiguration determineConfiguration() {
+		if (this.redisCacheConfiguration != null) {
+			return this.redisCacheConfiguration;
+		}
 		Redis redisProperties = this.cacheProperties.getRedis();
 		org.springframework.data.redis.cache.RedisCacheConfiguration config = org.springframework.data.redis.cache.RedisCacheConfiguration
 				.defaultCacheConfig();

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/cache/CacheAutoConfigurationTests.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -279,7 +279,7 @@ public class CacheAutoConfigurationTests {
 
 	@Test
 	public void redisCacheExplicit() {
-		this.contextRunner.withUserConfiguration(RedisCacheConfiguration.class)
+		this.contextRunner.withUserConfiguration(RedisConfiguration.class)
 				.withPropertyValues("spring.cache.type=redis",
 						"spring.cache.redis.time-to-live=15000",
 						"spring.cache.redis.cacheNullValues=false",
@@ -300,17 +300,36 @@ public class CacheAutoConfigurationTests {
 				});
 	}
 
+	@Test
+	public void redisCacheWithRedisCacheConfiguration() {
+		this.contextRunner
+				.withUserConfiguration(RedisWithCacheConfigurationConfiguration.class)
+				.withPropertyValues("spring.cache.type=redis",
+						"spring.cache.redis.time-to-live=15000",
+						"spring.cache.redis.keyPrefix=foo")
+				.run((context) -> {
+					RedisCacheManager cacheManager = getCacheManager(context,
+							RedisCacheManager.class);
+					assertThat(cacheManager.getCacheNames()).isEmpty();
+					org.springframework.data.redis.cache.RedisCacheConfiguration redisCacheConfiguration = (org.springframework.data.redis.cache.RedisCacheConfiguration) new DirectFieldAccessor(
+							cacheManager).getPropertyValue("defaultCacheConfig");
+					assertThat(redisCacheConfiguration.getTtl())
+							.isEqualTo(java.time.Duration.ofSeconds(30));
+					assertThat(redisCacheConfiguration.getKeyPrefix()).contains("bar");
+				});
+	}
+
 	@Test
 	public void redisCacheWithCustomizers() {
 		this.contextRunner
-				.withUserConfiguration(RedisCacheAndCustomizersConfiguration.class)
+				.withUserConfiguration(RedisWithCustomizersConfiguration.class)
 				.withPropertyValues("spring.cache.type=" + "redis")
 				.run(dunno("allCacheManagerCustomizer", "redisCacheManagerCustomizer"));
 	}
 
 	@Test
 	public void redisCacheExplicitWithCaches() {
-		this.contextRunner.withUserConfiguration(RedisCacheConfiguration.class)
+		this.contextRunner.withUserConfiguration(RedisConfiguration.class)
 				.withPropertyValues("spring.cache.type=redis",
 						"spring.cache.cacheNames[0]=foo",
 						"spring.cache.cacheNames[1]=bar")
@@ -919,7 +938,7 @@ public class CacheAutoConfigurationTests {
 
 	@Configuration
 	@EnableCaching
-	static class RedisCacheConfiguration {
+	static class RedisConfiguration {
 
 		@Bean
 		public RedisConnectionFactory redisConnectionFactory() {
@@ -929,8 +948,22 @@ public class CacheAutoConfigurationTests {
 	}
 
 	@Configuration
-	@Import({ RedisCacheConfiguration.class, CacheManagerCustomizersConfiguration.class })
-	static class RedisCacheAndCustomizersConfiguration {
+	@Import(RedisConfiguration.class)
+	static class RedisWithCacheConfigurationConfiguration {
+
+		@Bean
+		public org.springframework.data.redis.cache.RedisCacheConfiguration customRedisCacheConfiguration() {
+			return org.springframework.data.redis.cache.RedisCacheConfiguration
+					.defaultCacheConfig()
+					.entryTtl(java.time.Duration.ofSeconds(30))
+					.prefixKeysWith("bar");
+		}
+
+	}
+
+	@Configuration
+	@Import({ RedisConfiguration.class, CacheManagerCustomizersConfiguration.class })
+	static class RedisWithCustomizersConfiguration {
 
 	}
 

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

@@ -4638,6 +4638,10 @@ key, Redis does not have overlapping keys and cannot return invalid values. We s
 recommend keeping this setting enabled if you create your own `RedisCacheManager`.
 ====
 
+TIP: You can take full control of the configuration by adding a `RedisCacheConfiguration`
+`@Bean` of your own. This can be useful if you're looking for customizing the
+serialization strategy.
+
 
 
 [[boot-features-caching-provider-caffeine]]