working example of patch deployment

examples/src/main/java/io/kubernetes/client/examples/PatchExample.java

@@ -0,0 +1,85 @@
+/*
+Copyright 2018 The Kubernetes 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 io.kubernetes.client.examples;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import io.kubernetes.client.ApiClient;
+import io.kubernetes.client.ApiException;
+import io.kubernetes.client.Configuration;
+import io.kubernetes.client.apis.ExtensionsV1beta1Api;
+import io.kubernetes.client.models.ExtensionsV1beta1Deployment;
+import io.kubernetes.client.util.ClientBuilder;
+import java.io.IOException;
+import java.util.ArrayList;
+
+/**
+ * A simple Example of how to use the Java API.<br>
+ * This example demonstrates patching of deployment using Json Patch.<br>
+ * For generating Json Patches, refer <a href="http://jsonpatch.com/">http://jsonpatch.com</a>.
+ *
+ * <ul>
+ *   <li>Creates deployment hello-node with <b>terminationGracePeriodSeconds</b> value as 30.
+ *   <li>Patches deployment hello-node with <b>terminationGracePeriodSeconds</b> value as 27.
+ * </ul>
+ *
+ * <p>Easiest way to run this: mvn exec:java
+ * -Dexec.mainClass="io.kubernetes.client.examples.PatchExample"
+ *
+ * <p>From inside $REPO_DIR/examples
+ */
+public class PatchExample {
+  static String jsonPatchStr =
+      "{\"op\":\"replace\",\"path\":\"/spec/template/spec/terminationGracePeriodSeconds\",\"value\":27}";
+  static String jsonDepStr =
+      "{\"kind\":\"Deployment\",\"apiVersion\":\"extensions/v1beta1\",\"metadata\":{\"name\":\"hello-node\",\"creationTimestamp\":null,\"labels\":{\"run\":\"hello-node\"}},\"spec\":{\"replicas\":1,\"selector\":{\"matchLabels\":{\"run\":\"hello-node\"}},\"template\":{\"metadata\":{\"creationTimestamp\":null,\"labels\":{\"run\":\"hello-node\"}},\"spec\":{\"terminationGracePeriodSeconds\":30,\"containers\":[{\"name\":\"hello-node\",\"image\":\"hello-node:v1\",\"ports\":[{\"containerPort\":8080}],\"resources\":{}}]}},\"strategy\":{}},\"status\":{}}";
+
+  public static void main(String[] args) throws IOException, ApiException {
+    PatchExample example = new PatchExample();
+    ApiClient client = ClientBuilder.defaultClient();
+    Configuration.setDefaultApiClient(client);
+
+    ExtensionsV1beta1Deployment body =
+        (ExtensionsV1beta1Deployment)
+            example.deserialize(jsonDepStr, ExtensionsV1beta1Deployment.class);
+    ExtensionsV1beta1Deployment deploy1 = example.createDeployment("default", body, "false");
+    System.out.println("original deployment" + deploy1);
+
+    ArrayList<JsonObject> arr = new ArrayList<>();
+    arr.add(((JsonElement) example.deserialize(jsonPatchStr, JsonElement.class)).getAsJsonObject());
+    ExtensionsV1beta1Deployment deploy2 =
+        example.PatchDeployment("hello-node", "default", arr, "false");
+    System.out.println("patched deployment" + deploy2);
+  }
+
+  public ExtensionsV1beta1Deployment createDeployment(
+      String namespace, ExtensionsV1beta1Deployment body, String pretty) throws ApiException {
+    ExtensionsV1beta1Api api = new ExtensionsV1beta1Api();
+    ExtensionsV1beta1Deployment deploy = api.createNamespacedDeployment(namespace, body, pretty);
+    return deploy;
+  }
+
+  public ExtensionsV1beta1Deployment PatchDeployment(
+      String deployName, String namespace, Object body, String pretty) throws ApiException {
+    ExtensionsV1beta1Api api = new ExtensionsV1beta1Api();
+    ExtensionsV1beta1Deployment deploy =
+        api.patchNamespacedDeployment(deployName, namespace, body, pretty);
+    return deploy;
+  }
+
+  public Object deserialize(String jsonStr, Class<?> targetClass) {
+    Object obj = (new Gson()).fromJson(jsonStr, targetClass);
+    return obj;
+  }
+}