JDK 11 HttpClient async implement for AsyncFeign.

java11/pom.xml

@@ -69,6 +69,11 @@
       <type>jar</type>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>com.google.code.gson</groupId>
+      <artifactId>gson</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>

java11/src/main/java/feign/http2client/Http2Client.java

@@ -1,5 +1,5 @@
 /**
- * Copyright 2012-2020 The Feign Authors
+ * Copyright 2012-2021 The Feign 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
@@ -13,11 +13,6 @@
  */
 package feign.http2client;
 
-import feign.Client;
-import feign.Request;
-import feign.Request.Options;
-import feign.Response;
-import feign.Util;
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.net.URI;
@@ -32,11 +27,28 @@
 import java.net.http.HttpResponse;
 import java.net.http.HttpResponse.BodyHandlers;
 import java.time.Duration;
-import java.util.*;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.OptionalLong;
+import java.util.Set;
+import java.util.TreeSet;
+import java.util.concurrent.CompletableFuture;
 import java.util.function.Function;
 import java.util.stream.Collectors;
+import feign.AsyncClient;
+import feign.Client;
+import feign.Request;
+import feign.Request.Options;
+import feign.Response;
+import feign.Util;
 
-public class Http2Client implements Client {
+public class Http2Client implements Client, AsyncClient<Object> {
 
   private final HttpClient client;
 
@@ -59,9 +71,16 @@ public Http2Client(HttpClient client) {
 
   @Override
   public Response execute(Request request, Options options) throws IOException {
-    final HttpRequest httpRequest = newRequestBuilder(request, options).build();
-    HttpClient clientForRequest = getOrCreateClient(options);
+    final HttpRequest httpRequest;
+    try {
+      httpRequest = newRequestBuilder(request, options)
+          .version(client.version())
+          .build();
+    } catch (URISyntaxException e) {
+      throw new IOException("Invalid uri " + request.url(), e);
+    }
 
+    HttpClient clientForRequest = getOrCreateClient(options);
     HttpResponse<byte[]> httpResponse;
     try {
       httpResponse = clientForRequest.send(httpRequest, BodyHandlers.ofByteArray());
@@ -70,17 +89,37 @@ public Response execute(Request request, Options options) throws IOException {
       throw new IOException("Invalid uri " + request.url(), e);
     }
 
+    return toFeignResponse(request, httpResponse);
+  }
+
+  @Override
+  public CompletableFuture<Response> execute(Request request,
+                                             Options options,
+                                             Optional<Object> requestContext) {
+    HttpRequest httpRequest;
+    try {
+      httpRequest = newRequestBuilder(request, options).build();
+    } catch (URISyntaxException e) {
+      throw new IllegalArgumentException("Invalid uri " + request.url(), e);
+    }
+
+    HttpClient clientForRequest = getOrCreateClient(options);
+    CompletableFuture<HttpResponse<byte[]>> future =
+        clientForRequest.sendAsync(httpRequest, HttpResponse.BodyHandlers.ofByteArray());
+    return future.thenApply(httpResponse -> toFeignResponse(request, httpResponse));
+  }
+
+  protected Response toFeignResponse(Request request, HttpResponse<byte[]> httpResponse) {
     final OptionalLong length = httpResponse.headers().firstValueAsLong("Content-Length");
 
-    final Response response = Response.builder()
+    return Response.builder()
         .body(new ByteArrayInputStream(httpResponse.body()),
             length.isPresent() ? (int) length.getAsLong() : null)
         .reason(httpResponse.headers().firstValue("Reason-Phrase").orElse("OK"))
         .request(request)
         .status(httpResponse.statusCode())
         .headers(castMapCollectType(httpResponse.headers().map()))
         .build();
-    return response;
   }
 
   private HttpClient getOrCreateClient(Options options) {
@@ -116,13 +155,8 @@ private static java.net.http.HttpClient.Builder newClientBuilder(Options options
         .connectTimeout(Duration.ofMillis(options.connectTimeoutMillis()));
   }
 
-  private Builder newRequestBuilder(Request request, Options options) throws IOException {
-    URI uri;
-    try {
-      uri = new URI(request.url());
-    } catch (final URISyntaxException e) {
-      throw new IOException("Invalid uri " + request.url(), e);
-    }
+  private Builder newRequestBuilder(Request request, Options options) throws URISyntaxException {
+    URI uri = new URI(request.url());
 
     final BodyPublisher body;
     final byte[] data = request.body();
@@ -135,7 +169,7 @@ private Builder newRequestBuilder(Request request, Options options) throws IOExc
     final Builder requestBuilder = HttpRequest.newBuilder()
         .uri(uri)
         .timeout(Duration.ofMillis(options.readTimeoutMillis()))
-        .version(Version.HTTP_2);
+        .version(client.version());
 
     final Map<String, Collection<String>> headers = filterRestrictedHeaders(request.headers());
     if (!headers.isEmpty()) {

java11/src/test/java/feign/http2client/test/CustomPojo.java

@@ -0,0 +1,25 @@
+/**
+ * Copyright 2012-2020 The Feign 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
+ *
+ * http://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 feign.http2client.test;
+
+public class CustomPojo {
+
+  private final String name;
+  private final Integer number;
+
+  CustomPojo(String name, Integer number) {
+    this.name = name;
+    this.number = number;
+  }
+}