| 1 | /** |
| 2 | * Copyright (C) 2008 NetMind Consulting Bt. |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 3 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with this library; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | */ |
| 18 | |
| 19 | package hu.netmind.beankeeper.management.impl; |
| 20 | |
| 21 | import hu.netmind.beankeeper.common.StoreException; |
| 22 | import hu.netmind.beankeeper.management.ManagementTracker; |
| 23 | import hu.netmind.beankeeper.event.PersistenceEventListener; |
| 24 | import hu.netmind.beankeeper.event.PersistenceEvent; |
| 25 | import hu.netmind.beankeeper.event.EventDispatcher; |
| 26 | import hu.netmind.beankeeper.node.NodeManager; |
| 27 | import hu.netmind.beankeeper.node.event.NodeStateChangeEvent; |
| 28 | import java.util.*; |
| 29 | import javax.management.ObjectName; |
| 30 | import javax.management.MBeanServer; |
| 31 | import java.lang.management.ManagementFactory; |
| 32 | import org.apache.log4j.Logger; |
| 33 | |
| 34 | /** |
| 35 | * This implementation is waiting for the node to become connected to register the mbeans. |
| 36 | * If a reconnect occurs, the beans are re-registered with the new node id. |
| 37 | * @author Brautigam Robert |
| 38 | * @version Revision: $Revision$ |
| 39 | */ |
| 40 | public class ManagementTrackerImpl implements ManagementTracker, PersistenceEventListener |
| 41 | { |
| 42 | private static final Logger logger = Logger.getLogger(ManagementTrackerImpl.class); |
| 43 | |
| 44 | private Map<String,Object> beans = new HashMap<String,Object>(); |
| 45 | private int nodeId = 0; |
| 46 | |
| 47 | private EventDispatcher eventDispatcher = null; // Injected |
| 48 | |
| 49 | /** |
| 50 | * Register as listener. |
| 51 | */ |
| 52 | public void init(Map parameters) |
| 53 | { |
| 54 | eventDispatcher.registerListener(this); |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * Remove all beans from JMX, and unregister from event |
| 59 | * dispatcher. |
| 60 | */ |
| 61 | public void release() |
| 62 | { |
| 63 | eventDispatcher.unregisterListener(this); |
| 64 | deregisterBeans(); |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * Register a JMX bean with the given name. |
| 69 | */ |
| 70 | public void registerBean(String name, Object bean) |
| 71 | { |
| 72 | beans.put(name,bean); |
| 73 | registerBeanInternal(name,bean); |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Deregister the bean with the given name. |
| 78 | */ |
| 79 | public void deregisterBean(String name) |
| 80 | { |
| 81 | beans.remove(name); |
| 82 | deregisterBeanInternal(name); |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Register all beans to JMX. |
| 87 | */ |
| 88 | private void registerBeans() |
| 89 | { |
| 90 | for ( Map.Entry<String,Object> entry : beans.entrySet() ) |
| 91 | registerBeanInternal(entry.getKey(),entry.getValue()); |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Deregister all beans from JMX. |
| 96 | */ |
| 97 | private void deregisterBeans() |
| 98 | { |
| 99 | for ( Map.Entry<String,Object> entry : beans.entrySet() ) |
| 100 | deregisterBeanInternal(entry.getKey()); |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Register a single bean into JMX. |
| 105 | */ |
| 106 | private void registerBeanInternal(String name, Object object) |
| 107 | { |
| 108 | if ( nodeId == 0 ) |
| 109 | return; // Do nothing, node not initialized |
| 110 | try |
| 111 | { |
| 112 | MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); |
| 113 | mbs.registerMBean(object,new ObjectName( |
| 114 | "hu.netmind.beankeeper:type="+name+",node="+nodeId)); |
| 115 | if ( logger.isDebugEnabled() ) |
| 116 | logger.debug("registered JMX bean: "+name); |
| 117 | } catch ( Exception e ) { |
| 118 | throw new StoreException("could not register JMX bean: "+name,e); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Deregister a single bean from JMX. |
| 124 | */ |
| 125 | private void deregisterBeanInternal(String name) |
| 126 | { |
| 127 | if ( nodeId == 0 ) |
| 128 | return; // Do nothing, node not initialized |
| 129 | try |
| 130 | { |
| 131 | MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); |
| 132 | mbs.unregisterMBean(new ObjectName( |
| 133 | "hu.netmind.beankeeper:type="+name+",node="+nodeId)); |
| 134 | if ( logger.isDebugEnabled() ) |
| 135 | logger.debug("deregistered JMX bean: "+name); |
| 136 | } catch ( Exception e ) { |
| 137 | throw new StoreException("could not deregister JMX bean: "+name,e); |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Listen to node events, and deregister all beans |
| 143 | * when the node disconnects, register all beans when |
| 144 | * node initializes. |
| 145 | */ |
| 146 | public void handle(PersistenceEvent event) |
| 147 | throws Exception |
| 148 | { |
| 149 | if ( event instanceof NodeStateChangeEvent ) |
| 150 | { |
| 151 | NodeStateChangeEvent stateEvent = (NodeStateChangeEvent) event; |
| 152 | if ( (stateEvent.getNewState() == NodeManager.NodeState.INITIALIZED) && |
| 153 | (stateEvent.getOldState().getLevel() < NodeManager.NodeState.INITIALIZED.getLevel()) ) |
| 154 | { |
| 155 | // Node entered initialized state from a lower state, so register all beans |
| 156 | // and remember the node's id |
| 157 | nodeId = stateEvent.getNodeId(); |
| 158 | if ( logger.isDebugEnabled() ) |
| 159 | logger.debug("node initialized, with id '"+nodeId+"', registering all beans"); |
| 160 | registerBeans(); |
| 161 | } |
| 162 | if ( (stateEvent.getNewState().getLevel() < NodeManager.NodeState.INITIALIZED.getLevel()) && |
| 163 | (stateEvent.getOldState() == NodeManager.NodeState.INITIALIZED) ) |
| 164 | { |
| 165 | // Node left initialized state for a lower state, so deregister beans |
| 166 | if ( logger.isDebugEnabled() ) |
| 167 | logger.debug("node uninitialized, removing all JMX beans"); |
| 168 | try |
| 169 | { |
| 170 | deregisterBeans(); |
| 171 | } finally { |
| 172 | nodeId=0; |
| 173 | } |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | |