| /** |
| * 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.activemq.transport.discovery.http; |
| |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| import java.util.ArrayList; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class DiscoveryRegistryServlet extends HttpServlet { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(HTTPDiscoveryAgent.class); |
| long maxKeepAge = 1000*60*60; // 1 hour. |
| ConcurrentHashMap<String, ConcurrentHashMap<String, Long>> serviceGroups = new ConcurrentHashMap<String, ConcurrentHashMap<String, Long>>(); |
| |
| @Override |
| protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { |
| String group = req.getPathInfo(); |
| String service = req.getHeader("service"); |
| LOG.debug("Registering: group="+group+", service="+service); |
| |
| ConcurrentHashMap<String, Long> services = getServiceGroup(group); |
| services.put(service, System.currentTimeMillis()); |
| } |
| |
| private ConcurrentHashMap<String, Long> getServiceGroup(String group) { |
| ConcurrentHashMap<String, Long> rc = serviceGroups.get(group); |
| if( rc == null ) { |
| rc = new ConcurrentHashMap<String, Long>(); |
| serviceGroups.put(group, rc); |
| } |
| return rc; |
| } |
| |
| @Override |
| protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { |
| try { |
| long freshness = 1000*30; |
| String p = req.getParameter("freshness"); |
| if( p!=null ) { |
| freshness = Long.parseLong(p); |
| } |
| |
| String group = req.getPathInfo(); |
| LOG.debug("group="+group); |
| ConcurrentHashMap<String, Long> services = getServiceGroup(group); |
| PrintWriter writer = resp.getWriter(); |
| |
| long now = System.currentTimeMillis(); |
| long dropTime = now-maxKeepAge; |
| long minimumTime = now-freshness; |
| |
| ArrayList<String> dropList = new ArrayList<String>(); |
| for (Map.Entry<String, Long> entry : services.entrySet()) { |
| if( entry.getValue() > minimumTime ) { |
| writer.println(entry.getKey()); |
| } else if( entry.getValue() < dropTime ) { |
| dropList.add(entry.getKey()); |
| } |
| } |
| |
| // We might as well get rid of the really old entries. |
| for (String service : dropList) { |
| services.remove(service); |
| } |
| |
| |
| } catch (Exception e) { |
| resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Error occured: "+e); |
| } |
| } |
| |
| @Override |
| protected void doDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { |
| String group = req.getPathInfo(); |
| String service = req.getHeader("service"); |
| LOG.debug("Unregistering: group="+group+", service="+service); |
| |
| ConcurrentHashMap<String, Long> services = getServiceGroup(group); |
| services.remove(service); |
| } |
| |
| } |