Add back LoadBalancerRestClientBuilderBeanPostProcessor.

spring-cloud-commons/src/main/java/org/springframework/cloud/client/loadbalancer/LoadBalancerRestClientBuilderBeanPostProcessor.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2012-2024 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.cloud.client.loadbalancer;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.config.BeanPostProcessor;
+import org.springframework.context.ApplicationContext;
+import org.springframework.http.client.ClientHttpRequestInterceptor;
+import org.springframework.web.client.RestClient;
+
+/**
+ * A {@link BeanPostProcessor} that adds the provided {@link ClientHttpRequestInterceptor}
+ * to all {@link RestClient.Builder} instances annotated with {@link LoadBalanced}.
+ *
+ * @author Olga Maciaszek-Sharma
+ * @since 4.1.0
+ * @deprecated to be removed in the next release.
+ */
+@Deprecated
+public class LoadBalancerRestClientBuilderBeanPostProcessor implements BeanPostProcessor {
+
+	private final ClientHttpRequestInterceptor loadBalancerInterceptor;
+
+	private final ApplicationContext context;
+
+	public LoadBalancerRestClientBuilderBeanPostProcessor(ClientHttpRequestInterceptor loadBalancerInterceptor,
+			ApplicationContext context) {
+		this.loadBalancerInterceptor = loadBalancerInterceptor;
+		this.context = context;
+	}
+
+	@Override
+	public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
+		if (bean instanceof RestClient.Builder) {
+			if (context.findAnnotationOnBean(beanName, LoadBalanced.class) == null) {
+				return bean;
+			}
+			((RestClient.Builder) bean).requestInterceptor(loadBalancerInterceptor);
+		}
+		return bean;
+	}
+
+}