feat(loadbalancer): add multi API version support (#535)

relates to STACKITSDK-420

Author: rubenhoenle

CHANGELOG.md

@@ -9,6 +9,8 @@
   - Deprecate `getSchedule` and `listSchedules` methods in `SfsApi` class
 - `serverupdate`: [v0.2.0](services/serverupdate/CHANGELOG.md#v020)
   - **Feature (breaking change):** Introduction of multi API version support. See the GitHub discussion post for more details: https://github.com/stackitcloud/stackit-sdk-java/discussions/530
+- `loadbalancer`: [v0.5.0](services/loadbalancer/CHANGELOG.md#v050)
+  - **Feature (breaking change):** Introduction of multi API version support. See the GitHub discussion post for more details: https://github.com/stackitcloud/stackit-sdk-java/discussions/530
 
 ## Release (2026-04-08)
 - `iaas`: 

examples/loadbalancer/src/main/java/cloud/stackit/sdk/loadbalancer/examples/LoadBalancerExample.java

@@ -1,8 +1,8 @@
 package cloud.stackit.sdk.loadbalancer.examples;
 
 import cloud.stackit.sdk.core.exception.ApiException;
-import cloud.stackit.sdk.loadbalancer.api.LoadBalancerApi;
-import cloud.stackit.sdk.loadbalancer.model.*;
+import cloud.stackit.sdk.loadbalancer.v2api.api.LoadBalancerApi;
+import cloud.stackit.sdk.loadbalancer.v2api.model.*;
 import java.io.IOException;
 import java.net.HttpURLConnection;
 import java.util.*;

services/loadbalancer/CHANGELOG.md

@@ -1,3 +1,6 @@
+## v0.5.0
+- **Feature (breaking change):** Introduction of multi API version support. See the GitHub discussion post for more details: https://github.com/stackitcloud/stackit-sdk-java/discussions/530
+
 ## v0.4.0
 - Deprecation of methods `serverNameIndicators`, `setServerNameIndicators` and `getServerNameIndicators` in `Listener` model class
 

services/loadbalancer/README.md

@@ -1,12 +1,5 @@
 # STACKIT Java SDK for STACKIT Network Load Balancer API
 
-- API version: 2.0.0
-
-This API offers an interface to provision and manage load balancing servers in your STACKIT project. It also has the possibility of pooling target servers for load balancing purposes.
-
-For each load balancer provided, two VMs are deployed in your OpenStack project subject to a fee.
-
-
 This package is part of the STACKIT Java SDK. For additional information, please visit the [GitHub repository](https://github.com/stackitcloud/stackit-sdk-java) of the SDK.
 
 ## Installation from Maven Central (recommended)

services/loadbalancer/VERSION

@@ -1 +1 @@
-0.4.0
+0.5.0

services/loadbalancer/src/main/java/cloud/stackit/sdk/loadbalancer/v1api/ApiCallback.java

@@ -0,0 +1,60 @@
+/*
+ * STACKIT Network Load Balancer API
+ * ### DEPRECATED! This API offers an interface to provision and manage load balancing servers in your STACKIT project. It also has the possibility of pooling target servers for load balancing purposes.  For each load balancer provided, two VMs are deployed in your OpenStack project subject to a fee.
+ *
+ * The version of the OpenAPI document: 1.7.2
+ *
+ *
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+package cloud.stackit.sdk.loadbalancer.v1api;
+
+import cloud.stackit.sdk.core.exception.ApiException;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Callback for asynchronous API call.
+ *
+ * @param <T> The return type
+ */
+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, 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, int statusCode, Map<String, List<String>> responseHeaders);
+
+	/**
+	 * This is called when the API upload processing.
+	 *
+	 * @param bytesWritten bytes Written
+	 * @param contentLength content length of request body
+	 * @param done write end
+	 */
+	void onUploadProgress(long bytesWritten, long contentLength, boolean done);
+
+	/**
+	 * This is called when the API download processing.
+	 *
+	 * @param bytesRead bytes Read
+	 * @param contentLength content length of the response
+	 * @param done Read end
+	 */
+	void onDownloadProgress(long bytesRead, long contentLength, boolean done);
+}