| /* |
| * 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.ace.deployment.servlet; |
| |
| import java.io.IOException; |
| |
| import javax.servlet.Filter; |
| import javax.servlet.FilterChain; |
| import javax.servlet.FilterConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.ServletRequest; |
| import javax.servlet.ServletResponse; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.apache.ace.deployment.provider.OverloadedException; |
| |
| public class OverloadedFilter implements Filter { |
| |
| private static final String HTTP_RETRY_AFTER = "Retry-After"; |
| |
| @Override |
| public void init(FilterConfig config) throws ServletException { |
| } |
| |
| @Override |
| public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException { |
| HttpServletResponse httpResponse = (HttpServletResponse) response; |
| try { |
| filterChain.doFilter(request, response); |
| } |
| catch (OverloadedException oe) { |
| OverloadedException overloadedException = (OverloadedException) oe; |
| httpResponse.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE); |
| httpResponse.setHeader(HTTP_RETRY_AFTER, "" + overloadedException.getBackoffTime()); |
| } |
| } |
| |
| @Override |
| public void destroy() { |
| } |
| } |