add example

Author: yue9944882

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

@@ -0,0 +1,36 @@
+package io.kubernetes.client.examples;
+
+import io.kubernetes.client.ApiClient;
+import io.kubernetes.client.Configuration;
+import io.kubernetes.client.apis.CoreV1Api;
+import io.kubernetes.client.informer.*;
+import io.kubernetes.client.models.V1Node;
+import io.kubernetes.client.models.V1Pod;
+import io.kubernetes.client.util.Config;
+
+public class InformerExample {
+  public static void main(String[] args) throws Exception {
+
+    ApiClient client = Config.defaultClient();
+    Configuration.setDefaultApiClient(client);
+
+    SharedInformerFactory factory = new SharedInformerFactory();
+
+    // Node informer
+    ClusterScopeInformer<V1Node> nodeInformer =
+        factory.informerForClusterScopeResource(CoreV1Api.class, V1Node.class);
+    ClusterScopeLister<V1Node> nodeLister = nodeInformer.lister();
+
+    // Pod informer watching all namespaces
+    NamespacedInformer<V1Pod> podInformerForAllNamespaces =
+        factory.informerForNamespacedResource(CoreV1Api.class, V1Pod.class, "");
+    NamespacedLister<V1Pod> podLister = podInformerForAllNamespaces.lister();
+
+    // Pod informer watch default namespace
+    NamespacedInformer<V1Pod> podInformerForDefaultNamespace =
+        factory.informerForNamespacedResource(CoreV1Api.class, V1Pod.class, "default");
+    NamespacedLister<V1Pod> podLister2 = podInformerForDefaultNamespace.lister();
+
+    factory.start();
+  }
+}