Polish "Enable Redis connection pool if commons-pool2 is available"

See spring-projectsgh-26326

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

@@ -41,7 +41,6 @@
  *
  * @author Mark Paluch
  * @author Stephane Nicoll
- * @author Weix Sun
  */
 @Configuration(proxyBeanMethods = false)
 @ConditionalOnClass({ GenericObjectPool.class, JedisConnection.class, Jedis.class })
@@ -77,7 +76,7 @@ private JedisClientConfiguration getJedisClientConfiguration(
 			ObjectProvider<JedisClientConfigurationBuilderCustomizer> builderCustomizers) {
 		JedisClientConfigurationBuilder builder = applyProperties(JedisClientConfiguration.builder());
 		RedisProperties.Pool pool = getProperties().getJedis().getPool();
-		if (pool.isEnabled()) {
+		if (isPoolEnabled(pool)) {
 			applyPooling(pool, builder);
 		}
 		if (StringUtils.hasText(getProperties().getUrl())) {

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

@@ -51,7 +51,6 @@
  *
  * @author Mark Paluch
  * @author Andy Wilkinson
- * @author Weix Sun
  */
 @Configuration(proxyBeanMethods = false)
 @ConditionalOnClass(RedisClient.class)
@@ -105,7 +104,7 @@ private LettuceClientConfiguration getLettuceClientConfiguration(
 	}
 
 	private LettuceClientConfigurationBuilder createBuilder(Pool pool) {
-		if (pool.isEnabled()) {
+		if (isPoolEnabled(pool)) {
 			return new PoolBuilderFactory().createBuilder(pool);
 		}
 		return LettuceClientConfiguration.builder();

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -22,12 +22,14 @@
 import java.util.List;
 
 import org.springframework.beans.factory.ObjectProvider;
+import org.springframework.boot.autoconfigure.data.redis.RedisProperties.Pool;
 import org.springframework.data.redis.connection.RedisClusterConfiguration;
 import org.springframework.data.redis.connection.RedisNode;
 import org.springframework.data.redis.connection.RedisPassword;
 import org.springframework.data.redis.connection.RedisSentinelConfiguration;
 import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
 import org.springframework.util.Assert;
+import org.springframework.util.ClassUtils;
 import org.springframework.util.StringUtils;
 
 /**
@@ -40,6 +42,9 @@
  */
 abstract class RedisConnectionConfiguration {
 
+	private static final boolean COMMONS_POOL2_AVAILABLE = ClassUtils.isPresent("org.apache.commons.pool2.ObjectPool",
+			RedisConnectionConfiguration.class.getClassLoader());
+
 	private final RedisProperties properties;
 
 	private final RedisSentinelConfiguration sentinelConfiguration;
@@ -122,6 +127,11 @@ protected final RedisProperties getProperties() {
 		return this.properties;
 	}
 
+	protected boolean isPoolEnabled(Pool pool) {
+		Boolean enabled = pool.getEnabled();
+		return (enabled != null) ? enabled : COMMONS_POOL2_AVAILABLE;
+	}
+
 	private List<RedisNode> createSentinels(RedisProperties.Sentinel sentinel) {
 		List<RedisNode> nodes = new ArrayList<>();
 		for (String node : sentinel.getNodes()) {

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

@@ -233,7 +233,11 @@ public enum ClientType {
 	 */
 	public static class Pool {
 
-		private boolean enabled;
+		/**
+		 * Whether to enable the pool. Enabled automatically if "commons-pool2" is
+		 * available.
+		 */
+		private Boolean enabled;
 
 		/**
 		 * Maximum number of "idle" connections in the pool. Use a negative value to
@@ -267,11 +271,11 @@ public static class Pool {
 		 */
 		private Duration timeBetweenEvictionRuns;
 
-		public boolean isEnabled() {
+		public Boolean getEnabled() {
 			return this.enabled;
 		}
 
-		public void setEnabled(boolean enabled) {
+		public void setEnabled(Boolean enabled) {
 			this.enabled = enabled;
 		}
 
@@ -406,13 +410,7 @@ public static class Jedis {
 		/**
 		 * Jedis pool configuration.
 		 */
-		private final Pool pool;
-
-		public Jedis() {
-			Pool pool = new Pool();
-			pool.setEnabled(true);
-			this.pool = pool;
-		}
+		private final Pool pool = new Pool();
 
 		public Pool getPool() {
 			return this.pool;

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/redis/RedisAutoConfigurationLettuceWithoutCommonsPool2Tests.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2012-2021 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.boot.autoconfigure.data.redis;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.boot.testsupport.classpath.ClassPathExclusions;
+import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
+import org.springframework.data.redis.connection.lettuce.LettucePoolingClientConfiguration;
+import org.springframework.test.util.ReflectionTestUtils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link RedisAutoConfiguration} when commons-pool2 is not on the classpath.
+ *
+ * @author Stephane Nicoll
+ */
+@ClassPathExclusions("commons-pool2-*.jar")
+public class RedisAutoConfigurationLettuceWithoutCommonsPool2Tests {
+
+	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(RedisAutoConfiguration.class));
+
+	@Test
+	void poolWithoutCommonsPool2IsDisabledByDefault() {
+		this.contextRunner.withPropertyValues("spring.redis.host:foo").run((context) -> {
+			LettuceConnectionFactory cf = context.getBean(LettuceConnectionFactory.class);
+			assertThat(cf.getHostName()).isEqualTo("foo");
+			assertThat(ReflectionTestUtils.getField(cf, "clientConfiguration"))
+					.isNotInstanceOf(LettucePoolingClientConfiguration.class);
+		});
+	}
+
+}

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

@@ -31,6 +31,7 @@
 import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.autoconfigure.data.redis.RedisProperties.Pool;
 import org.springframework.boot.test.context.assertj.AssertableApplicationContext;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.boot.test.context.runner.ContextConsumer;
@@ -156,25 +157,24 @@ void testPasswordInUrlStartsWithColon() {
 	}
 
 	@Test
-	void testRedisConfigurationWithPoolUsingDefaultValue() {
-		this.contextRunner.withPropertyValues("spring.redis.host:foo", "spring.redis.lettuce.pool.enabled:true")
-				.run((context) -> {
-					LettuceConnectionFactory cf = context.getBean(LettuceConnectionFactory.class);
-					assertThat(cf.getHostName()).isEqualTo("foo");
-					GenericObjectPoolConfig<?> poolConfig = getPoolingClientConfiguration(cf).getPoolConfig();
-					assertThat(poolConfig.getMinIdle()).isEqualTo(0);
-					assertThat(poolConfig.getMaxIdle()).isEqualTo(8);
-					assertThat(poolConfig.getMaxTotal()).isEqualTo(8);
-					assertThat(poolConfig.getMaxWaitMillis()).isEqualTo(-1);
-				});
+	void testRedisConfigurationUsePoolByDefault() {
+		Pool defaultPool = new RedisProperties().getLettuce().getPool();
+		this.contextRunner.withPropertyValues("spring.redis.host:foo").run((context) -> {
+			LettuceConnectionFactory cf = context.getBean(LettuceConnectionFactory.class);
+			assertThat(cf.getHostName()).isEqualTo("foo");
+			GenericObjectPoolConfig<?> poolConfig = getPoolingClientConfiguration(cf).getPoolConfig();
+			assertThat(poolConfig.getMinIdle()).isEqualTo(defaultPool.getMinIdle());
+			assertThat(poolConfig.getMaxIdle()).isEqualTo(defaultPool.getMaxIdle());
+			assertThat(poolConfig.getMaxTotal()).isEqualTo(defaultPool.getMaxActive());
+			assertThat(poolConfig.getMaxWaitMillis()).isEqualTo(defaultPool.getMaxWait().toMillis());
+		});
 	}
 
 	@Test
-	void testRedisConfigurationWithPoolUsingCustomValue() {
-		this.contextRunner.withPropertyValues("spring.redis.host:foo", "spring.redis.lettuce.pool.enabled:true",
-				"spring.redis.lettuce.pool.min-idle:1", "spring.redis.lettuce.pool.max-idle:4",
-				"spring.redis.lettuce.pool.max-active:16", "spring.redis.lettuce.pool.max-wait:2000",
-				"spring.redis.lettuce.pool.time-between-eviction-runs:30000",
+	void testRedisConfigurationWithCustomPoolSettings() {
+		this.contextRunner.withPropertyValues("spring.redis.host:foo", "spring.redis.lettuce.pool.min-idle:1",
+				"spring.redis.lettuce.pool.max-idle:4", "spring.redis.lettuce.pool.max-active:16",
+				"spring.redis.lettuce.pool.max-wait:2000", "spring.redis.lettuce.pool.time-between-eviction-runs:30000",
 				"spring.redis.lettuce.shutdown-timeout:1000").run((context) -> {
 					LettuceConnectionFactory cf = context.getBean(LettuceConnectionFactory.class);
 					assertThat(cf.getHostName()).isEqualTo("foo");

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

@@ -46,7 +46,7 @@ If you use Jedis, `JedisClientConfigurationBuilderCustomizer` is also available.
 
 If you add your own `@Bean` of any of the auto-configured types, it replaces the default (except in the case of `RedisTemplate`, when the exclusion is based on the bean name, `redisTemplate`, not its type).
 
-A pooled connection factory is auto-configured if `commons-pool2` is on the classpath and at least one `Pool` option of {spring-boot-autoconfigure-module-code}/data/redis/RedisProperties.java[`RedisProperties`] is set.
+By default, a pooled connection factory is auto-configured if `commons-pool2` is on the classpath.