Rename classes after review.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -27,6 +27,7 @@ import org.springframework.util.concurrent.ListenableFuture;
 
 /**
  * @author Rob Worsnop
+ * @author Olga Maciaszek-Sharma
  */
 public class AsyncLoadBalancerInterceptor implements AsyncClientHttpRequestInterceptor {
 
@@ -41,11 +42,8 @@ public class AsyncLoadBalancerInterceptor implements AsyncClientHttpRequestInter
 			final AsyncClientHttpRequestExecution execution) throws IOException {
 		final URI originalUri = request.getURI();
 		String serviceName = originalUri.getHost();
-		return this.loadBalancer.execute(serviceName, instance -> {
-			HttpRequest serviceRequest = new ServiceRequestWrapper(request, instance,
-					AsyncLoadBalancerInterceptor.this.loadBalancer);
-			return execution.executeAsync(serviceRequest, body);
-		});
+		return loadBalancer.execute(serviceName, new AsyncLoadBalancerRequest(loadBalancer,
+				new AsyncLoadBalancerRequest.ClientHttpRequestData(request, body, execution)));
 	}
 
 }

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

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2012-2022 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.cloud.client.ServiceInstance;
+import org.springframework.http.HttpRequest;
+import org.springframework.http.client.AsyncClientHttpRequestExecution;
+import org.springframework.http.client.ClientHttpResponse;
+import org.springframework.util.concurrent.ListenableFuture;
+
+/**
+ * Default {@link LoadBalancerRequest} implementation for async use-cases.
+ *
+ * @author Olga Maciaszek-Sharma
+ * @since 3.1.2
+ */
+class AsyncLoadBalancerRequest implements HttpRequestLoadBalancerRequest<ListenableFuture<ClientHttpResponse>> {
+
+	private final LoadBalancerClient loadBalancer;
+
+	private final ClientHttpRequestData clientHttpRequestData;
+
+	AsyncLoadBalancerRequest(LoadBalancerClient loadBalancer, ClientHttpRequestData clientHttpRequestData) {
+		this.loadBalancer = loadBalancer;
+		this.clientHttpRequestData = clientHttpRequestData;
+	}
+
+	@Override
+	public ListenableFuture<ClientHttpResponse> apply(ServiceInstance instance) throws Exception {
+		HttpRequest serviceRequest = new ServiceRequestWrapper(clientHttpRequestData.request, instance, loadBalancer);
+		return clientHttpRequestData.execution.executeAsync(serviceRequest, clientHttpRequestData.body);
+	}
+
+	@Override
+	public HttpRequest getHttpRequest() {
+		return clientHttpRequestData.request;
+	}
+
+	static class ClientHttpRequestData {
+
+		private final HttpRequest request;
+
+		private final byte[] body;
+
+		private final AsyncClientHttpRequestExecution execution;
+
+		ClientHttpRequestData(HttpRequest request, byte[] body, AsyncClientHttpRequestExecution execution) {
+			this.request = request;
+			this.body = body;
+			this.execution = execution;
+		}
+
+	}
+
+}

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

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2012-2022 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 java.util.List;
+
+import org.springframework.cloud.client.ServiceInstance;
+import org.springframework.http.HttpRequest;
+import org.springframework.http.client.ClientHttpRequestExecution;
+import org.springframework.http.client.ClientHttpResponse;
+
+/**
+ * Default {@link LoadBalancerRequest} implementation.
+ *
+ * @author Olga Maciaszek-Sharma
+ * @since 3.1.2
+ */
+class BlockingLoadBalancerRequest implements HttpRequestLoadBalancerRequest<ClientHttpResponse> {
+
+	private final LoadBalancerClient loadBalancer;
+
+	private final List<LoadBalancerRequestTransformer> transformers;
+
+	private final ClientHttpRequestData clientHttpRequestData;
+
+	BlockingLoadBalancerRequest(LoadBalancerClient loadBalancer, List<LoadBalancerRequestTransformer> transformers,
+			ClientHttpRequestData clientHttpRequestData) {
+		this.loadBalancer = loadBalancer;
+		this.transformers = transformers;
+		this.clientHttpRequestData = clientHttpRequestData;
+	}
+
+	@Override
+	public ClientHttpResponse apply(ServiceInstance instance) throws Exception {
+		HttpRequest serviceRequest = new ServiceRequestWrapper(clientHttpRequestData.request, instance, loadBalancer);
+		if (this.transformers != null) {
+			for (LoadBalancerRequestTransformer transformer : this.transformers) {
+				serviceRequest = transformer.transformRequest(serviceRequest, instance);
+			}
+		}
+		return clientHttpRequestData.execution.execute(serviceRequest, clientHttpRequestData.body);
+	}
+
+	@Override
+	public HttpRequest getHttpRequest() {
+		return clientHttpRequestData.request;
+	}
+
+	static class ClientHttpRequestData {
+
+		private final HttpRequest request;
+
+		private final byte[] body;
+
+		private final ClientHttpRequestExecution execution;
+
+		ClientHttpRequestData(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) {
+			this.request = request;
+			this.body = body;
+			this.execution = execution;
+		}
+
+	}
+
+}

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

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2012-2022 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.http.HttpRequest;
+
+/**
+ * Represents a {@link LoadBalancerRequest} created on top of an {@link HttpRequest}.
+ *
+ * @author Olga Maciaszek-Sharma
+ * @since 3.1.2
+ */
+public interface HttpRequestLoadBalancerRequest<T> extends LoadBalancerRequest<T> {
+
+	HttpRequest getHttpRequest();
+
+}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -16,6 +16,7 @@
 
 package org.springframework.cloud.client.loadbalancer;
 
+import java.util.ArrayList;
 import java.util.List;
 
 import org.springframework.http.HttpRequest;
@@ -28,13 +29,14 @@ import org.springframework.http.client.ClientHttpResponse;
  * to the intercepted {@link HttpRequest}.
  *
  * @author William Tran
+ * @author Olga Maciaszek-Sharma
  *
  */
 public class LoadBalancerRequestFactory {
 
-	private LoadBalancerClient loadBalancer;
+	private final LoadBalancerClient loadBalancer;
 
-	private List<LoadBalancerRequestTransformer> transformers;
+	private final List<LoadBalancerRequestTransformer> transformers;
 
 	public LoadBalancerRequestFactory(LoadBalancerClient loadBalancer,
 			List<LoadBalancerRequestTransformer> transformers) {
@@ -44,19 +46,13 @@ public class LoadBalancerRequestFactory {
 
 	public LoadBalancerRequestFactory(LoadBalancerClient loadBalancer) {
 		this.loadBalancer = loadBalancer;
+		transformers = new ArrayList<>();
 	}
 
 	public LoadBalancerRequest<ClientHttpResponse> createRequest(final HttpRequest request, final byte[] body,
 			final ClientHttpRequestExecution execution) {
-		return instance -> {
-			HttpRequest serviceRequest = new ServiceRequestWrapper(request, instance, this.loadBalancer);
-			if (this.transformers != null) {
-				for (LoadBalancerRequestTransformer transformer : this.transformers) {
-					serviceRequest = transformer.transformRequest(serviceRequest, instance);
-				}
-			}
-			return execution.execute(serviceRequest, body);
-		};
+		return new BlockingLoadBalancerRequest(loadBalancer, transformers,
+				new BlockingLoadBalancerRequest.ClientHttpRequestData(request, body, execution));
 	}
 
 }

spring-cloud-loadbalancer/src/main/java/org/springframework/cloud/loadbalancer/blocking/client/BlockingLoadBalancerClient.java

@@ -28,6 +28,7 @@ import org.springframework.cloud.client.loadbalancer.DefaultRequest;
 import org.springframework.cloud.client.loadbalancer.DefaultRequestContext;
 import org.springframework.cloud.client.loadbalancer.DefaultResponse;
 import org.springframework.cloud.client.loadbalancer.EmptyResponse;
+import org.springframework.cloud.client.loadbalancer.HttpRequestLoadBalancerRequest;
 import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
 import org.springframework.cloud.client.loadbalancer.LoadBalancerLifecycle;
 import org.springframework.cloud.client.loadbalancer.LoadBalancerLifecycleValidator;
@@ -36,10 +37,14 @@ import org.springframework.cloud.client.loadbalancer.LoadBalancerRequest;
 import org.springframework.cloud.client.loadbalancer.LoadBalancerRequestAdapter;
 import org.springframework.cloud.client.loadbalancer.LoadBalancerUriTools;
 import org.springframework.cloud.client.loadbalancer.Request;
+import org.springframework.cloud.client.loadbalancer.RequestData;
+import org.springframework.cloud.client.loadbalancer.RequestDataContext;
 import org.springframework.cloud.client.loadbalancer.Response;
 import org.springframework.cloud.client.loadbalancer.ResponseData;
+import org.springframework.cloud.client.loadbalancer.TimedRequestContext;
 import org.springframework.cloud.client.loadbalancer.reactive.ReactiveLoadBalancer;
 import org.springframework.cloud.loadbalancer.support.LoadBalancerClientFactory;
+import org.springframework.http.HttpRequest;
 import org.springframework.http.client.ClientHttpResponse;
 import org.springframework.util.ReflectionUtils;
 
@@ -73,8 +78,8 @@ public class BlockingLoadBalancerClient implements LoadBalancerClient {
 	@Override
 	public <T> T execute(String serviceId, LoadBalancerRequest<T> request) throws IOException {
 		String hint = getHint(serviceId);
-		LoadBalancerRequestAdapter<T, DefaultRequestContext> lbRequest = new LoadBalancerRequestAdapter<>(request,
-				new DefaultRequestContext(request, hint));
+		LoadBalancerRequestAdapter<T, TimedRequestContext> lbRequest = new LoadBalancerRequestAdapter<>(request,
+				buildRequestContext(request, hint));
 		Set<LoadBalancerLifecycle> supportedLifecycleProcessors = getSupportedLifecycleProcessors(serviceId);
 		supportedLifecycleProcessors.forEach(lifecycle -> lifecycle.onStart(lbRequest));
 		ServiceInstance serviceInstance = choose(serviceId, lbRequest);
@@ -86,6 +91,17 @@ public class BlockingLoadBalancerClient implements LoadBalancerClient {
 		return execute(serviceId, serviceInstance, lbRequest);
 	}
 
+	private <T> TimedRequestContext buildRequestContext(LoadBalancerRequest<T> delegate, String hint) {
+		if (delegate instanceof HttpRequestLoadBalancerRequest) {
+			HttpRequest request = ((HttpRequestLoadBalancerRequest) delegate).getHttpRequest();
+			if (request != null) {
+				RequestData requestData = new RequestData(request);
+				return new RequestDataContext(requestData, hint);
+			}
+		}
+		return new DefaultRequestContext(delegate, hint);
+	}
+
 	@Override
 	public <T> T execute(String serviceId, ServiceInstance serviceInstance, LoadBalancerRequest<T> request)
 			throws IOException {