Don't install a shutdown hook by default #434

Author: lburgazzoli

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/Operator.java

@@ -1,5 +1,10 @@
 package io.javaoperatorsdk.operator;
 
+import java.io.Closeable;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
 import io.fabric8.kubernetes.api.model.apiextensions.v1.CustomResourceDefinition;
 import io.fabric8.kubernetes.client.CustomResource;
 import io.fabric8.kubernetes.client.KubernetesClient;
@@ -8,10 +13,6 @@
 import io.javaoperatorsdk.operator.api.config.ConfigurationService;
 import io.javaoperatorsdk.operator.api.config.ControllerConfiguration;
 import io.javaoperatorsdk.operator.processing.event.DefaultEventSourceManager;
-import java.io.Closeable;
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.List;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -27,7 +28,9 @@ public Operator(KubernetesClient k8sClient, ConfigurationService configurationSe
     this.k8sClient = k8sClient;
     this.configurationService = configurationService;
     this.closeables = new ArrayList<>();
+  }
 
+  public void installShutdownHook() {
     Runtime.getRuntime().addShutdownHook(new Thread(this::close));
   }