001/* 002 * (C) Copyright 2011 Nuxeo SA (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 */ 018 019package org.nuxeo.ecm.webapp.seam; 020 021import java.lang.management.ManagementFactory; 022import java.util.HashSet; 023import java.util.Iterator; 024import java.util.Set; 025 026import javax.management.JMX; 027import javax.management.MBeanServer; 028import javax.management.MXBean; 029import javax.management.MalformedObjectNameException; 030import javax.management.ObjectInstance; 031import javax.management.ObjectName; 032import javax.servlet.ServletContextEvent; 033import javax.servlet.ServletContextListener; 034 035import org.apache.commons.logging.Log; 036import org.apache.commons.logging.LogFactory; 037 038/** 039 * Listener for Seam cache flush requests 040 * 041 * @since 5.5 042 */ 043public class NuxeoSeamWebGate implements ServletContextListener { 044 045 protected static NuxeoSeamWebGate instance; 046 047 protected static Log log = LogFactory.getLog(NuxeoSeamWebGate.class); 048 049 protected boolean initialized; 050 051 public NuxeoSeamWebGate() { 052 instance = this; 053 } 054 055 @Override 056 public void contextDestroyed(ServletContextEvent arg0) { 057 initialized = false; 058 } 059 060 @Override 061 public void contextInitialized(ServletContextEvent arg0) { 062 initialized = true; 063 } 064 065 @MXBean 066 public interface WebConnector { 067 String getStateName(); 068 } 069 070 protected final Set<WebConnector> waitingConnectors = fetchConnectors(); 071 072 protected Set<WebConnector> fetchConnectors() { 073 Set<WebConnector> connectors = new HashSet<WebConnector>(); 074 MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); 075 ObjectName names; 076 try { 077 names = new ObjectName("Catalina:type=Connector,port=*,address=*"); 078 } catch (MalformedObjectNameException e) { 079 log.error("Cannot query for tomcat connectors", e); 080 return connectors; 081 } 082 Set<ObjectInstance> ois = mbs.queryMBeans(names, null); 083 for (ObjectInstance oi : ois) { 084 WebConnector connector = JMX.newMBeanProxy(mbs, oi.getObjectName(), WebConnector.class); 085 connectors.add(connector); 086 } 087 return connectors; 088 } 089 090 protected synchronized boolean checkConnectorsUp() { 091 Iterator<WebConnector> it = waitingConnectors.iterator(); 092 while (it.hasNext()) { 093 WebConnector connector = it.next(); 094 if ("STARTED".equals(connector.getStateName())) { 095 it.remove(); 096 } 097 } 098 return waitingConnectors.isEmpty(); 099 } 100 101 public static boolean isInitialized() { 102 if (instance == null) { 103 return false; 104 } 105 if (instance.initialized == false) { 106 return false; 107 } 108 return instance.checkConnectorsUp(); 109 } 110 111}