Merge pull request #10944 from ryonday:redis-cache-config

* pr/10944:
  Polish "Improve cache auto-configuration for Redis"
  Improve cache auto-configuration for Redis
  Respond to MR feedback
  Improve spring-boot-autoconfigure for Redis caches

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

@@ -29,6 +29,7 @@ import org.springframework.util.Assert;
  *
  * @author Stephane Nicoll
  * @author Eddú Meléndez
+ * @author Ryon Day
  * @since 1.3.0
  */
 @ConfigurationProperties(prefix = "spring.cache")
@@ -55,6 +56,8 @@ public class CacheProperties {
 
 	private final JCache jcache = new JCache();
 
+	private final Redis redis = new Redis();
+
 	public CacheType getType() {
 		return this.type;
 	}
@@ -91,6 +94,10 @@ public class CacheProperties {
 		return this.jcache;
 	}
 
+	public Redis getRedis() {
+		return this.redis;
+	}
+
 	/**
 	 * Resolve the config location if set.
 	 * @param config the config resource
@@ -233,4 +240,63 @@ public class CacheProperties {
 
 	}
 
+	/**
+	 * Redis-specific cache properties.
+	 */
+	public static class Redis {
+
+		/**
+		 * Entry expiration in milliseconds. By default the entries never expire.
+		 */
+		private long timeToLive = 0;
+
+		/**
+		 * Allow caching null values.
+		 */
+		private boolean cacheNullValues = true;
+
+		/**
+		 * Key prefix.
+		 */
+		private String keyPrefix;
+
+		/**
+		 * Whether to use the key prefix when writing to Redis.
+		 */
+		private boolean useKeyPrefix = true;
+
+		public long getTimeToLive() {
+			return this.timeToLive;
+		}
+
+		public void setTimeToLive(long timeToLive) {
+			this.timeToLive = timeToLive;
+		}
+
+		public boolean isCacheNullValues() {
+			return this.cacheNullValues;
+		}
+
+		public void setCacheNullValues(boolean cacheNullValues) {
+			this.cacheNullValues = cacheNullValues;
+		}
+
+		public String getKeyPrefix() {
+			return this.keyPrefix;
+		}
+
+		public void setKeyPrefix(String keyPrefix) {
+			this.keyPrefix = keyPrefix;
+		}
+
+		public boolean isUseKeyPrefix() {
+			return this.useKeyPrefix;
+		}
+
+		public void setUseKeyPrefix(boolean useKeyPrefix) {
+			this.useKeyPrefix = useKeyPrefix;
+		}
+
+	}
+
 }

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

@@ -16,10 +16,12 @@
 
 package org.springframework.boot.autoconfigure.cache;
 
+import java.time.Duration;
 import java.util.LinkedHashSet;
 import java.util.List;
 
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
+import org.springframework.boot.autoconfigure.cache.CacheProperties.Redis;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration;
@@ -36,6 +38,7 @@ import org.springframework.data.redis.connection.RedisConnectionFactory;
  *
  * @author Stephane Nicoll
  * @author Mark Paluch
+ * @author Ryon Day
  * @since 1.3.0
  */
 @Configuration
@@ -58,7 +61,7 @@ class RedisCacheConfiguration {
 	@Bean
 	public RedisCacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {
 		RedisCacheManagerBuilder builder = RedisCacheManager
-				.builder(redisConnectionFactory);
+				.builder(redisConnectionFactory).cacheDefaults(getConfiguration());
 		List<String> cacheNames = this.cacheProperties.getCacheNames();
 		if (!cacheNames.isEmpty()) {
 			builder.initialCacheNames(new LinkedHashSet<>(cacheNames));
@@ -66,4 +69,21 @@ class RedisCacheConfiguration {
 		return this.customizerInvoker.customize(builder.build());
 	}
 
+	private org.springframework.data.redis.cache.RedisCacheConfiguration getConfiguration() {
+		Redis redisProperties = this.cacheProperties.getRedis();
+		org.springframework.data.redis.cache.RedisCacheConfiguration config = org.springframework.data.redis.cache.RedisCacheConfiguration
+				.defaultCacheConfig();
+		config = config.entryTtl(Duration.ofMillis(redisProperties.getTimeToLive()));
+		if (redisProperties.getKeyPrefix() != null) {
+			config = config.prefixKeysWith(redisProperties.getKeyPrefix());
+		}
+		if (!redisProperties.isCacheNullValues()) {
+			config = config.disableCachingNullValues();
+		}
+		if (!redisProperties.isUseKeyPrefix()) {
+			config = config.disableKeyPrefix();
+		}
+		return config;
+	}
+
 }

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

@@ -90,6 +90,7 @@ import static org.mockito.Mockito.verify;
  * @author Stephane Nicoll
  * @author Eddú Meléndez
  * @author Mark Paluch
+ * @author Ryon Day
  */
 @RunWith(ModifiedClassPathRunner.class)
 @ClassPathExclusions("hazelcast-client-*.jar")
@@ -280,14 +281,23 @@ public class CacheAutoConfigurationTests {
 	@Test
 	public void redisCacheExplicit() {
 		this.contextRunner.withUserConfiguration(RedisCacheConfiguration.class)
-				.withPropertyValues("spring.cache.type=redis").run((context) -> {
+				.withPropertyValues("spring.cache.type=redis",
+						"spring.cache.redis.time-to-live=15000",
+						"spring.cache.redis.cacheNullValues=false",
+						"spring.cache.redis.keyPrefix=foo",
+						"spring.cache.redis.useKeyPrefix=false")
+				.run((context) -> {
 					RedisCacheManager cacheManager = getCacheManager(context,
 							RedisCacheManager.class);
 					assertThat(cacheManager.getCacheNames()).isEmpty();
-					assertThat(
-							((org.springframework.data.redis.cache.RedisCacheConfiguration) new DirectFieldAccessor(
-									cacheManager).getPropertyValue("defaultCacheConfig"))
-											.usePrefix()).isTrue();
+					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(15));
+					assertThat(redisCacheConfiguration.getAllowCacheNullValues())
+							.isFalse();
+					assertThat(redisCacheConfiguration.getKeyPrefix()).contains("foo");
+					assertThat(redisCacheConfiguration.usePrefix()).isFalse();
 				});
 	}
 
@@ -309,6 +319,14 @@ public class CacheAutoConfigurationTests {
 					RedisCacheManager cacheManager = getCacheManager(context,
 							RedisCacheManager.class);
 					assertThat(cacheManager.getCacheNames()).containsOnly("foo", "bar");
+					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.ofMinutes(0));
+					assertThat(redisCacheConfiguration.getAllowCacheNullValues())
+							.isTrue();
+					assertThat(redisCacheConfiguration.getKeyPrefix()).isEmpty();
+					assertThat(redisCacheConfiguration.usePrefix()).isTrue();
 				});
 	}
 

spring-boot-project/spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc

@@ -77,6 +77,10 @@ content into your application; rather pick only the properties that you need.
 	spring.cache.infinispan.config= # The location of the configuration file to use to initialize Infinispan.
 	spring.cache.jcache.config= # The location of the configuration file to use to initialize the cache manager.
 	spring.cache.jcache.provider= # Fully qualified name of the CachingProvider implementation to use to retrieve the JSR-107 compliant cache manager. Only needed if more than one JSR-107 implementation is available on the classpath.
+	spring.cache.redis.cache-null-values=true # Allow caching null values.
+	spring.cache.redis.key-prefix= # Key prefix.
+	spring.cache.redis.time-to-live=0 # Entry expiration in milliseconds. By default the entries never expire.
+	spring.cache.redis.use-key-prefix=true # Whether to use the key prefix when writing to Redis.
 	spring.cache.type= # Cache type, auto-detected according to the environment by default.
 
 	# SPRING CONFIG - using environment property only ({sc-spring-boot}/context/config/ConfigFileApplicationListener.{sc-ext}[ConfigFileApplicationListener])

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

@@ -4546,9 +4546,17 @@ This sample configuration reuses the `Cluster` that was created via auto-configu
 
 [[boot-features-caching-provider-redis]]
 ==== Redis
-If Redis is available and configured, the `RedisCacheManager` is auto-configured. It is
-also possible to create additional caches on startup by setting the
-`spring.cache.cache-names` property.
+If Redis is available and configured, a `RedisCacheManager` is auto-configured. It is
+possible to create additional caches on startup by setting the
+`spring.cache.cache-names` property and cache defaults can be configured using
+`spring.redis.cache.*` properties. For instance, the following configuration creates
+`cache1` and `cache2` caches with a _time to live_ of 10 minutes:
+
+[source,properties,indent=0]
+----
+    spring.cache.cache-names=cache1,cache2
+	spring.cache.redis.time-to-live=600000
+----
 
 [NOTE]
 ====