Java-okhttp-gson: allow access to status code and response headers of last (async) request

modules/swagger-codegen/src/main/resources/Java/libraries/okhttp-gson/ApiCallback.mustache

@@ -2,6 +2,9 @@ package {{invokerPackage}};
 
 import java.io.IOException;
 
+import java.util.Map;
+import java.util.List;
+
 /**
  * Callback for asynchronous API call.
  *
@@ -10,13 +13,19 @@ import java.io.IOException;
 public interface ApiCallback<T> {
   /**
    * This is called when the API call fails.
+   *
+   * @param e The exception causing the failure
+   * @param statusCode Status code of the response if available, otherwise it would be 0
+   * @param responseHeaders Headers of the response if available, otherwise it would be null
    */
-  void onFailure(ApiException e);
+  void onFailure(ApiException e, int statusCode, Map<String, List<String>> responseHeaders);
 
   /**
    * This is called when the API call succeeded.
    *
    * @param result The result deserialized from response
+   * @param statusCode Status code of the response
+   * @param responseHeaders Headers of the response
    */
-  void onSuccess(T result);
+  void onSuccess(T result, int statusCode, Map<String, List<String>> responseHeaders);
 }

modules/swagger-codegen/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache

@@ -48,6 +48,9 @@ public class ApiClient {
 
   private Map<String, Authentication> authentications;
 
+  private int statusCode;
+  private Map<String, List<String>> responseHeaders;
+
   private String dateFormat;
   private DateFormat dateFormatter;
   private int dateLength;
@@ -107,6 +110,24 @@ public class ApiClient {
     return this;
   }
 
+  /**
+   * Gets the status code of the previous request.
+   * NOTE: Status code of last async response is not recorded here, it is
+   * passed to the callback methods instead.
+   */
+  public int getStatusCode() {
+    return statusCode;
+  }
+
+  /**
+   * Gets the response headers of the previous request.
+   * NOTE: Headers of last async response is not recorded here, it is passed
+   * to callback methods instead.
+   */
+  public Map<String, List<String>> getResponseHeaders() {
+    return responseHeaders;
+  }
+
   public String getDateFormat() {
     return dateFormat;
   }
@@ -534,6 +555,8 @@ public class ApiClient {
   public <T> T execute(Call call, Type returnType) throws ApiException {
     try {
       Response response = call.execute();
+      this.statusCode = response.code();
+      this.responseHeaders = response.headers().toMultimap();
       return handleResponse(response, returnType);
     } catch (IOException e) {
       throw new ApiException(e);
@@ -557,7 +580,7 @@ public class ApiClient {
     call.enqueue(new Callback() {
       @Override
       public void onFailure(Request request, IOException e) {
-        callback.onFailure(new ApiException(e));
+        callback.onFailure(new ApiException(e), 0, null);
       }
 
       @Override
@@ -566,10 +589,10 @@ public class ApiClient {
         try {
           result = (T) handleResponse(response, returnType);
         } catch (ApiException e) {
-          callback.onFailure(e);
+          callback.onFailure(e, response.code(), response.headers().toMultimap());
           return;
         }
-        callback.onSuccess(result);
+        callback.onSuccess(result, response.code(), response.headers().toMultimap());
       }
     });
   }