Add caching to all user-enabled configs other than healthcheck lb. (#1208)

Author: OlgaMaciaszek

spring-cloud-loadbalancer/src/main/java/org/springframework/cloud/loadbalancer/annotation/LoadBalancerClientConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -120,7 +120,7 @@ public ServiceInstanceListSupplier healthCheckDiscoveryClientServiceInstanceList
 		public ServiceInstanceListSupplier requestBasedStickySessionDiscoveryClientServiceInstanceListSupplier(
 				ConfigurableApplicationContext context) {
 			return ServiceInstanceListSupplier.builder().withDiscoveryClient().withRequestBasedStickySession()
-					.build(context);
+					.withCaching().build(context);
 		}
 
 		@Bean
@@ -130,7 +130,7 @@ public ServiceInstanceListSupplier requestBasedStickySessionDiscoveryClientServi
 		public ServiceInstanceListSupplier sameInstancePreferenceServiceInstanceListSupplier(
 				ConfigurableApplicationContext context) {
 			return ServiceInstanceListSupplier.builder().withDiscoveryClient().withSameInstancePreference()
-					.build(context);
+					.withCaching().build(context);
 		}
 
 	}
@@ -176,7 +176,7 @@ public ServiceInstanceListSupplier healthCheckDiscoveryClientServiceInstanceList
 		public ServiceInstanceListSupplier requestBasedStickySessionDiscoveryClientServiceInstanceListSupplier(
 				ConfigurableApplicationContext context) {
 			return ServiceInstanceListSupplier.builder().withBlockingDiscoveryClient().withRequestBasedStickySession()
-					.build(context);
+					.withCaching().build(context);
 		}
 
 		@Bean
@@ -186,7 +186,7 @@ public ServiceInstanceListSupplier requestBasedStickySessionDiscoveryClientServi
 		public ServiceInstanceListSupplier sameInstancePreferenceServiceInstanceListSupplier(
 				ConfigurableApplicationContext context) {
 			return ServiceInstanceListSupplier.builder().withBlockingDiscoveryClient().withSameInstancePreference()
-					.build(context);
+					.withCaching().build(context);
 		}
 
 	}

spring-cloud-loadbalancer/src/test/java/org/springframework/cloud/loadbalancer/annotation/LoadBalancerClientConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -119,10 +119,13 @@ void shouldInstantiateRequestBasedStickySessionServiceInstanceListSupplierTests(
 				.withPropertyValues("spring.cloud.loadbalancer.configurations=request-based-sticky-session")
 				.run(context -> {
 					ServiceInstanceListSupplier supplier = context.getBean(ServiceInstanceListSupplier.class);
-					then(supplier).isInstanceOf(RequestBasedStickySessionServiceInstanceListSupplier.class);
+					then(supplier).isInstanceOf(CachingServiceInstanceListSupplier.class);
 					ServiceInstanceListSupplier delegate = ((DelegatingServiceInstanceListSupplier) supplier)
 							.getDelegate();
-					then(delegate).isInstanceOf(DiscoveryClientServiceInstanceListSupplier.class);
+					then(delegate).isInstanceOf(RequestBasedStickySessionServiceInstanceListSupplier.class);
+					ServiceInstanceListSupplier secondDelegate = ((DelegatingServiceInstanceListSupplier) delegate)
+							.getDelegate();
+					then(secondDelegate).isInstanceOf(DiscoveryClientServiceInstanceListSupplier.class);
 				});
 	}