/** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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 org.apache.ambari.server.controller.utilities; import org.apache.ambari.server.controller.internal.ClusterControllerImpl; import org.apache.ambari.server.controller.spi.ClusterController; import org.apache.ambari.server.controller.spi.ProviderModule; import org.apache.ambari.server.view.ViewProviderModule; /** * Temporary class to bootstrap a cluster controller. TODO : Replace this global state with injection. */ public class ClusterControllerHelper { private static String PROVIDER_MODULE_CLASS = System.getProperty("provider.module.class", "org.apache.ambari.server.controller.internal.DefaultProviderModule"); private static ClusterController controller; public static synchronized ClusterController getClusterController() { if (controller == null) { try { Class<?> implClass = Class.forName(PROVIDER_MODULE_CLASS); ProviderModule providerModule = ViewProviderModule.getViewProviderModule((ProviderModule) implClass.newInstance()); controller = new ClusterControllerImpl(providerModule); } catch (Exception e) { throw new IllegalStateException("Can't create provider module " + PROVIDER_MODULE_CLASS, e); } } return controller; } }