content: /**
   * 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.listeners;
  
  import java.util.Collections;
  
  import jakarta.servlet.ServletContext;
  import jakarta.servlet.ServletContextEvent;
  import jakarta.servlet.ServletContextListener;
  
  import org.eclipse.jetty.websocket.server.JettyWebSocketServerContainer;
  import org.eclipse.jetty.websocket.server.config.JettyWebSocketServletContainerInitializer;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class WebSocketInitializerListener implements ServletContextListener {
      private static final Logger LOG = LoggerFactory.getLogger(WebSocketInitializerListener.class);
      private final JettyWebSocketServletContainerInitializer initializer;
  
      public WebSocketInitializerListener(JettyWebSocketServletContainerInitializer initializer) {
          this.initializer = initializer;
      }
      @Override
      public void contextInitialized(ServletContextEvent sce) {
          ServletContext servletContext = sce.getServletContext();
          try {
              initializer.onStartup(Collections.emptySet(), servletContext);
              LOG.info("WebSocket container initialized");
          } catch (Exception e) {
              e.printStackTrace();
          }
      }
  
      @Override
      public void contextDestroyed(ServletContextEvent sce) {
          ServletContext servletContext = sce.getServletContext();
          try {
              JettyWebSocketServerContainer container = (JettyWebSocketServerContainer) servletContext.getAttribute(JettyWebSocketServerContainer.class.getName());
  
              if (container != null) {
                  container.stop();
                  LOG.info("WebSocket container stopped.");
              } else {
                  LOG.info("No WebSocket container found during shutdown.");
              }
          } catch (Exception e) {
              e.printStackTrace();
          }
      }
  }
  