001/* 002 * #%L 003 * Netarchivesuite - monitor 004 * %% 005 * Copyright (C) 2005 - 2014 The Royal Danish Library, the Danish State and University Library, 006 * the National Library of France and the Austrian National Library. 007 * %% 008 * This program is free software: you can redistribute it and/or modify 009 * it under the terms of the GNU Lesser General Public License as 010 * published by the Free Software Foundation, either version 2.1 of the 011 * License, or (at your option) any later version. 012 * 013 * This program is distributed in the hope that it will be useful, 014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 016 * GNU General Lesser Public License for more details. 017 * 018 * You should have received a copy of the GNU General Lesser Public 019 * License along with this program. If not, see 020 * <http://www.gnu.org/licenses/lgpl-2.1.html>. 021 * #L% 022 */ 023package dk.netarkivet.monitor.registry.distribute; 024 025import org.slf4j.Logger; 026import org.slf4j.LoggerFactory; 027 028import dk.netarkivet.common.distribute.Channels; 029import dk.netarkivet.common.distribute.JMSConnectionFactory; 030import dk.netarkivet.common.exceptions.ArgumentNotValid; 031import dk.netarkivet.common.utils.CleanupIF; 032import dk.netarkivet.monitor.distribute.MonitorMessageHandler; 033import dk.netarkivet.monitor.registry.MonitorRegistry; 034 035/** 036 * The monitor registry server listens on JMS for hosts that wish to register themselves to the service. The registry 037 * lists hosts that can be monitored with JMX. 038 */ 039public class MonitorRegistryServer extends MonitorMessageHandler implements CleanupIF { 040 041 private static MonitorRegistryServer instance; 042 private static final Logger log = LoggerFactory.getLogger(MonitorRegistryServer.class); 043 044 /** 045 * Start listening for registry messages. 046 */ 047 private MonitorRegistryServer() { 048 JMSConnectionFactory.getInstance().setListener(Channels.getTheMonitorServer(), this); 049 log.info("MonitorRegistryServer listening for messages on channel '{}'", Channels.getTheMonitorServer()); 050 } 051 052 /** 053 * Get the registry server singleton. 054 * 055 * @return The registry server. 056 */ 057 public static MonitorRegistryServer getInstance() { 058 if (instance == null) { 059 instance = new MonitorRegistryServer(); 060 } 061 return instance; 062 } 063 064 /** 065 * This method registers the sender as a host to be monitored with JMX. 066 * 067 * @throws ArgumentNotValid on null parameter. 068 */ 069 public void visit(RegisterHostMessage msg) { 070 ArgumentNotValid.checkNotNull(msg, "RegisterHostMessage msg"); 071 MonitorRegistry.getInstance().register(msg.getHostEntry()); 072 } 073 074 /** Remove listener on shutdown. */ 075 public void cleanup() { 076 // FIXME These commands fail when shutting down properly. (kill $PID) 077 // instead of kill -9 $PID. See NAS-1976 078 // JMSConnectionFactory.getInstance().removeListener( 079 // Channels.getTheMonitorServer(), this); 080 } 081 082}