| /* |
| * 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.asyncweb.server.filter; |
| |
| import org.apache.asyncweb.server.HttpSession; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.asyncweb.server.HttpServiceContext; |
| import org.apache.asyncweb.server.HttpServiceFilter; |
| |
| /** |
| * A <code>ServiceHandler</code> which causes any existing session associated with |
| * each request it handles to be renewed. |
| * This causes sessions attached to requests to be renewed per-request - even if |
| * the request does not cause session access to occur. |
| * <p> |
| * This handler does not need to be installed for deployments which do not employ |
| * sessions |
| * </p> |
| */ |
| public class SessionKeepAliveFilter implements HttpServiceFilter |
| { |
| |
| private static final Logger LOG = LoggerFactory |
| .getLogger(SessionKeepAliveFilter.class); |
| |
| /** |
| * Handles the specified request. |
| * The session associated with the current request - if any - is retrieved - |
| * causing its lease to be renewed. |
| */ |
| public void handleRequest(NextFilter next, HttpServiceContext context) { |
| HttpSession session = context.getSession(false); |
| if (session != null) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Session renewed: " + session.getId()); |
| } |
| } else { |
| LOG.debug("No session to renew"); |
| } |
| next.invoke(); |
| } |
| |
| public void start() { |
| // Not interested in startup |
| } |
| |
| public void stop() { |
| // Not interested in shutdown |
| } |
| |
| /** |
| * Simply moves the response forward in the chain |
| */ |
| public void handleResponse(NextFilter next, HttpServiceContext context) { |
| next.invoke(); |
| } |
| } |