WsContextListener.java
- /*
- * 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.tomcat.websocket.server;
- import javax.servlet.ServletContext;
- import javax.servlet.ServletContextEvent;
- import javax.servlet.ServletContextListener;
- /**
- * In normal usage, this {@link ServletContextListener} does not need to be explicitly configured as the {@link WsSci}
- * performs all the necessary bootstrap and installs this listener in the {@link ServletContext}. If the {@link WsSci}
- * is disabled, this listener must be added manually to every {@link ServletContext} that uses WebSocket to bootstrap
- * the {@link WsServerContainer} correctly.
- */
- public class WsContextListener implements ServletContextListener {
- @Override
- public void contextInitialized(ServletContextEvent sce) {
- ServletContext sc = sce.getServletContext();
- // Don't trigger WebSocket initialization if a WebSocket Server
- // Container is already present
- if (sc.getAttribute(Constants.SERVER_CONTAINER_SERVLET_CONTEXT_ATTRIBUTE) == null) {
- WsSci.init(sce.getServletContext(), false);
- }
- }
- @Override
- public void contextDestroyed(ServletContextEvent sce) {
- ServletContext sc = sce.getServletContext();
- Object obj = sc.getAttribute(Constants.SERVER_CONTAINER_SERVLET_CONTEXT_ATTRIBUTE);
- if (obj instanceof WsServerContainer) {
- ((WsServerContainer) obj).destroy();
- }
- }
- }