org.apache.activemq.transport.discovery.http.DiscoveryRegistryServlet Maven / Gradle / Ivy
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Puts together an ActiveMQ OSGi bundle
/**
* 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 long serialVersionUID = 1L;
private static final Logger LOG = LoggerFactory.getLogger(HTTPDiscoveryAgent.class);
long maxKeepAge = 1000*60*60; // 1 hour.
ConcurrentHashMap> serviceGroups = new ConcurrentHashMap>();
@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 services = getServiceGroup(group);
services.put(service, System.currentTimeMillis());
}
private ConcurrentHashMap getServiceGroup(String group) {
ConcurrentHashMap rc = serviceGroups.get(group);
if( rc == null ) {
rc = new ConcurrentHashMap();
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 services = getServiceGroup(group);
PrintWriter writer = resp.getWriter();
long now = System.currentTimeMillis();
long dropTime = now-maxKeepAge;
long minimumTime = now-freshness;
ArrayList dropList = new ArrayList();
for (Map.Entry 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 services = getServiceGroup(group);
services.remove(service);
}
}