add NoneLoadBalancerCacheManager

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/loadbalancer/ConditionalOnLoadBalancerNacos.java

@@ -25,7 +25,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 
 @Retention(RetentionPolicy.RUNTIME)
 @Target({ ElementType.TYPE, ElementType.METHOD })
-@ConditionalOnProperty(value = "loadbalancer.nacos.default.enabled", matchIfMissing = false)
+@ConditionalOnProperty(value = "loadbalancer.nacos.enabled", matchIfMissing = true)
 public @interface ConditionalOnLoadBalancerNacos {
 
 }

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/loadbalancer/ConditionalOnLoadBalancerNacosDefault.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2013-2018 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.
+ * 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 com.alibaba.cloud.nacos.loadbalancer;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ ElementType.TYPE, ElementType.METHOD })
+@ConditionalOnProperty(value = "loadbalancer.nacos.default.enabled", matchIfMissing = false)
+public @interface ConditionalOnLoadBalancerNacosDefault {
+
+}

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/loadbalancer/LoadBalancerNacosAutoConfiguration.java

@@ -19,9 +19,13 @@ package com.alibaba.cloud.nacos.loadbalancer;
 import com.alibaba.cloud.nacos.ConditionalOnNacosDiscoveryEnabled;
 
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.cloud.loadbalancer.annotation.LoadBalancerClients;
+import org.springframework.cloud.loadbalancer.cache.LoadBalancerCacheManager;
 import org.springframework.cloud.loadbalancer.config.LoadBalancerAutoConfiguration;
+import org.springframework.cloud.loadbalancer.config.LoadBalancerCacheAutoConfiguration;
+import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
 /**
@@ -32,8 +36,14 @@ import org.springframework.context.annotation.Configuration;
 @EnableConfigurationProperties
 @ConditionalOnLoadBalancerNacos
 @ConditionalOnNacosDiscoveryEnabled
-@AutoConfigureBefore(LoadBalancerAutoConfiguration.class)
+@AutoConfigureBefore({ LoadBalancerAutoConfiguration.class,
+		LoadBalancerCacheAutoConfiguration.class })
 @LoadBalancerClients(defaultConfiguration = NacosLoadBalancerClientConfiguration.class)
 public class LoadBalancerNacosAutoConfiguration {
 
+	@Bean
+	@ConditionalOnMissingBean
+	public LoadBalancerCacheManager noneLoadBalancerCacheManager() {
+		return new NoneLoadBalancerCacheManager();
+	}
 }

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/loadbalancer/NacosLoadBalancerClientConfiguration.java

@@ -34,6 +34,7 @@ public class NacosLoadBalancerClientConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean
+	@ConditionalOnLoadBalancerNacosDefault
 	public ReactorLoadBalancer<ServiceInstance> nacosLoadBalancer(Environment environment,
 			LoadBalancerClientFactory loadBalancerClientFactory,
 			NacosDiscoveryProperties nacosDiscoveryProperties) {

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/loadbalancer/NoneLoadBalancerCacheManager.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2013-2018 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.
+ * 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 com.alibaba.cloud.nacos.loadbalancer;
+
+import java.util.Collection;
+
+import org.springframework.cache.Cache;
+import org.springframework.cloud.loadbalancer.cache.LoadBalancerCacheManager;
+
+/**
+ * Don't cache.<br>
+ * <br>
+ * 1. LoadBalancerCache causes information such as the weight of the service instance to
+ * be changed without immediate effect.<br>
+ * 2. Nacos itself supports caching.
+ *
+ * @author XuDaojie
+ * @since 2021.1
+ */
+public class NoneLoadBalancerCacheManager implements LoadBalancerCacheManager {
+
+	@Override
+	public Cache getCache(String name) {
+		return null;
+	}
+
+	@Override
+	public Collection<String> getCacheNames() {
+		return null;
+	}
+}