| /* |
| * 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.slider.server.services.utility; |
| |
| import org.apache.hadoop.service.AbstractService; |
| import org.apache.hadoop.yarn.webapp.WebApp; |
| |
| /** |
| * Contains a webapp reference and stops it in teardown if non-null |
| * |
| * It does not start the application. |
| * Access to the field is not synchronized across threads; it is the |
| * responsibility of the caller. |
| */ |
| public class WebAppService<T extends WebApp> extends AbstractService { |
| |
| private T webApp; |
| |
| public WebAppService(String name) { |
| super(name); |
| } |
| |
| public WebAppService(String name, T app) { |
| super(name); |
| webApp = app; |
| } |
| |
| public T getWebApp() { |
| return webApp; |
| } |
| |
| public void setWebApp(T webApp) { |
| this.webApp = webApp; |
| } |
| |
| |
| @Override |
| protected void serviceStart() throws Exception { |
| |
| } |
| |
| /** |
| * Stop operation stops the webapp; sets the reference to null |
| * @throws Exception |
| */ |
| @Override |
| protected void serviceStop() throws Exception { |
| if (webApp != null) { |
| webApp.stop(); |
| webApp = null; |
| } |
| } |
| } |