Use synchonous API for synchonous OkHttp requests

This commit changes the OkHttpClientHttpRequestFactory to use the
synchronous OkHttp API for non-async requests, as opposed to
synchronizing the async API (which it used to do).

Issue: SPR-13942

spring-web/src/main/java/org/springframework/http/client/OkHttpAsyncClientHttpRequest.java

+/*
+ * Copyright 2002-2016 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
+ *
+ *      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 org.springframework.http.client;
+
+import java.io.IOException;
+import java.net.URI;
+
+import com.squareup.okhttp.Call;
+import com.squareup.okhttp.Callback;
+import com.squareup.okhttp.OkHttpClient;
+import com.squareup.okhttp.Request;
+import com.squareup.okhttp.Response;
+
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.util.concurrent.ListenableFuture;
+import org.springframework.util.concurrent.SettableListenableFuture;
+
+/**
+ * {@link AsyncClientHttpRequest} implementation that uses OkHttp to execute requests.
+ *
+ * <p>Created via the {@link OkHttpClientHttpRequestFactory}.
+ *
+ * @author Luciano Leggieri
+ * @author Arjen Poutsma
+ * @since 4.3
+ */
+class OkHttpAsyncClientHttpRequest extends AbstractBufferingAsyncClientHttpRequest {
+
+	private final OkHttpClient client;
+
+	private final URI uri;
+
+	private final HttpMethod method;
+
+
+	public OkHttpAsyncClientHttpRequest(OkHttpClient client, URI uri, HttpMethod method) {
+		this.client = client;
+		this.uri = uri;
+		this.method = method;
+	}
+
+
+	@Override
+	public HttpMethod getMethod() {
+		return this.method;
+	}
+
+	@Override
+	public URI getURI() {
+		return this.uri;
+	}
+
+	@Override
+	protected ListenableFuture<ClientHttpResponse> executeInternal(HttpHeaders headers, byte[] content)
+			throws IOException {
+
+		Request request = OkHttpClientHttpRequestFactory
+				.buildRequest(headers, content, this.uri, this.method);
+
+		return new OkHttpListenableFuture(this.client.newCall(request));
+	}
+
+	private static class OkHttpListenableFuture
+			extends SettableListenableFuture<ClientHttpResponse> {
+
+		private final Call call;
+
+		public OkHttpListenableFuture(Call call) {
+			this.call = call;
+			this.call.enqueue(new Callback() {
+				@Override
+				public void onResponse(Response response) {
+					set(new OkHttpClientHttpResponse(response));
+				}
+
+				@Override
+				public void onFailure(Request request, IOException ex) {
+					setException(ex);
+				}
+			});
+		}
+
+		@Override
+		protected void interruptTask() {
+			this.call.cancel();
+		}
+	}
+
+}

spring-web/src/main/java/org/springframework/http/client/OkHttpClientHttpRequest.java

 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -18,24 +18,12 @@ package org.springframework.http.client;
 
 import java.io.IOException;
 import java.net.URI;
-import java.net.URL;
-import java.util.List;
-import java.util.Map;
-import java.util.concurrent.ExecutionException;
-
-import com.squareup.okhttp.Call;
-import com.squareup.okhttp.Callback;
-import com.squareup.okhttp.MediaType;
+
 import com.squareup.okhttp.OkHttpClient;
 import com.squareup.okhttp.Request;
-import com.squareup.okhttp.RequestBody;
-import com.squareup.okhttp.Response;
 
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
-import org.springframework.util.StringUtils;
-import org.springframework.util.concurrent.ListenableFuture;
-import org.springframework.util.concurrent.SettableListenableFuture;
 
 /**
  * {@link ClientHttpRequest} implementation that uses OkHttp to execute requests.
@@ -46,7 +34,7 @@ import org.springframework.util.concurrent.SettableListenableFuture;
  * @author Arjen Poutsma
  * @since 4.2
  */
-class OkHttpClientHttpRequest extends AbstractBufferingAsyncClientHttpRequest implements ClientHttpRequest {
+class OkHttpClientHttpRequest extends AbstractBufferingClientHttpRequest {
 
 	private final OkHttpClient client;
 
@@ -72,73 +60,15 @@ class OkHttpClientHttpRequest extends AbstractBufferingAsyncClientHttpRequest im
 		return this.uri;
 	}
 
-	@Override
-	protected ListenableFuture<ClientHttpResponse> executeInternal(HttpHeaders headers, byte[] content)
-			throws IOException {
-
-		MediaType contentType = getContentType(headers);
-		RequestBody body = (content.length > 0 ? RequestBody.create(contentType, content) : null);
-
-		URL url = this.uri.toURL();
-		String methodName = this.method.name();
-		Request.Builder builder = new Request.Builder().url(url).method(methodName, body);
-
-		for (Map.Entry<String, List<String>> entry : headers.entrySet()) {
-			String headerName = entry.getKey();
-			for (String headerValue : entry.getValue()) {
-				builder.addHeader(headerName, headerValue);
-			}
-		}
-		Request request = builder.build();
-
-		return new OkHttpListenableFuture(this.client.newCall(request));
-	}
-
-	private MediaType getContentType(HttpHeaders headers) {
-		String rawContentType = headers.getFirst("Content-Type");
-		return (StringUtils.hasText(rawContentType) ? MediaType.parse(rawContentType) : null);
-	}
 
 	@Override
-	public ClientHttpResponse execute() throws IOException {
-		try {
-			return executeAsync().get();
-		}
-		catch (InterruptedException ex) {
-			throw new IOException(ex.getMessage(), ex);
-		}
-		catch (ExecutionException ex) {
-			Throwable cause = ex.getCause();
-			if (cause instanceof IOException) {
-				throw (IOException) cause;
-			}
-			throw new IOException(cause.getMessage(), cause);
-		}
-	}
+	protected ClientHttpResponse executeInternal(HttpHeaders headers, byte[] content)
+			throws IOException {
 
+		Request request = OkHttpClientHttpRequestFactory
+				.buildRequest(headers, content, this.uri, this.method);
 
-	private static class OkHttpListenableFuture extends SettableListenableFuture<ClientHttpResponse> {
-
-	    private final Call call;
-
-	    public OkHttpListenableFuture(Call call) {
-	        this.call = call;
-	        this.call.enqueue(new Callback() {
-				@Override
-		        public void onResponse(Response response) {
-			        set(new OkHttpClientHttpResponse(response));
-		        }
-		        @Override
-		        public void onFailure(Request request, IOException ex) {
-			        setException(ex);
-		        }
-	        });
-	    }
-
-	    @Override
-	    protected void interruptTask() {
-	        this.call.cancel();
-	    }
+		return new OkHttpClientHttpResponse(this.client.newCall(request).execute());
 	}
 
 }

spring-web/src/main/java/org/springframework/http/client/OkHttpClientHttpRequestFactory.java

 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -16,14 +16,22 @@
 
 package org.springframework.http.client;
 
+import java.net.MalformedURLException;
 import java.net.URI;
+import java.net.URL;
+import java.util.List;
+import java.util.Map;
 import java.util.concurrent.TimeUnit;
 
 import com.squareup.okhttp.OkHttpClient;
+import com.squareup.okhttp.Request;
+import com.squareup.okhttp.RequestBody;
 
 import org.springframework.beans.factory.DisposableBean;
+import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
 import org.springframework.util.Assert;
+import org.springframework.util.StringUtils;
 
 /**
  * {@link ClientHttpRequestFactory} implementation that uses
@@ -90,18 +98,40 @@ public class OkHttpClientHttpRequestFactory
 
 	@Override
 	public ClientHttpRequest createRequest(URI uri, HttpMethod httpMethod) {
-		return createRequestInternal(uri, httpMethod);
+		return new OkHttpClientHttpRequest(this.client, uri, httpMethod);
 	}
 
 	@Override
 	public AsyncClientHttpRequest createAsyncRequest(URI uri, HttpMethod httpMethod) {
-		return createRequestInternal(uri, httpMethod);
+		return new OkHttpAsyncClientHttpRequest(this.client, uri, httpMethod);
 	}
 
-	private OkHttpClientHttpRequest createRequestInternal(URI uri, HttpMethod httpMethod) {
-		return new OkHttpClientHttpRequest(this.client, uri, httpMethod);
+	static Request buildRequest(HttpHeaders headers, byte[] content, URI uri,
+			HttpMethod method) throws MalformedURLException {
+		com.squareup.okhttp.MediaType contentType = getContentType(headers);
+		RequestBody body =
+				(content.length > 0 ? RequestBody.create(contentType, content) : null);
+
+		URL url = uri.toURL();
+		String methodName = method.name();
+		Request.Builder builder = new Request.Builder().url(url).method(methodName, body);
+
+		for (Map.Entry<String, List<String>> entry : headers.entrySet()) {
+			String headerName = entry.getKey();
+			for (String headerValue : entry.getValue()) {
+				builder.addHeader(headerName, headerValue);
+			}
+		}
+		return builder.build();
+	}
+
+	private static com.squareup.okhttp.MediaType getContentType(HttpHeaders headers) {
+		String rawContentType = headers.getFirst(HttpHeaders.CONTENT_TYPE);
+		return (StringUtils.hasText(rawContentType) ?
+				com.squareup.okhttp.MediaType.parse(rawContentType) : null);
 	}
 
+
 	@Override
 	public void destroy() throws Exception {
 		if (this.defaultClient) {