| // |
| // ======================================================================== |
| // Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.monitor; |
| |
| import java.io.IOException; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import javax.management.MBeanServerConnection; |
| |
| import org.eclipse.jetty.monitor.jmx.MonitorAction; |
| import org.eclipse.jetty.monitor.jmx.MonitorTask; |
| import org.eclipse.jetty.monitor.jmx.ServiceConnection; |
| import org.eclipse.jetty.xml.XmlConfiguration; |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * JMXMonitor |
| * |
| * Performs monitoring of the values of the attributes of MBeans |
| * and executes specified actions as well as sends notifications |
| * of the specified events that have occurred. |
| */ |
| public class JMXMonitor |
| { |
| private static JMXMonitor __monitor = new JMXMonitor(); |
| |
| private String _serverUrl; |
| private ServiceConnection _serviceConnection; |
| |
| private Set<MonitorAction> _actions = new HashSet<MonitorAction>(); |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Constructs a JMXMonitor instance. Used for XML Configuration. |
| * |
| * !! DO NOT INSTANTIATE EXPLICITLY !! |
| */ |
| public JMXMonitor() {} |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Adds monitor actions to the monitor |
| * |
| * @param actions monitor actions to add |
| * @return true if successful |
| */ |
| public boolean addActions(MonitorAction... actions) |
| { |
| return getInstance().add(actions); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Removes monitor actions from the monitor |
| * |
| * @param actions monitor actions to remove |
| * @return true if successful |
| */ |
| public boolean removeActions(MonitorAction... actions) |
| { |
| return getInstance().remove(actions); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Sets the JMX server URL |
| * |
| * @param url URL of the JMX server |
| */ |
| public void setUrl(String url) |
| { |
| getInstance().set(url); |
| } |
| |
| public MBeanServerConnection getConnection() |
| throws IOException |
| { |
| return getInstance().get(); |
| } |
| |
| public static JMXMonitor getInstance() |
| { |
| return __monitor; |
| } |
| |
| public static boolean addMonitorActions(MonitorAction... actions) |
| { |
| return getInstance().add(actions); |
| } |
| |
| public static boolean removeMonitorActions(MonitorAction... actions) |
| { |
| return getInstance().remove(actions); |
| } |
| |
| public static void setServiceUrl(String url) |
| { |
| getInstance().set(url); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Retrieves a connection to JMX service |
| * |
| * @return server connection |
| * @throws IOException |
| */ |
| public static MBeanServerConnection getServiceConnection() |
| throws IOException |
| { |
| return getInstance().getConnection(); |
| } |
| |
| public static void main(final String args[]) throws Exception |
| { |
| XmlConfiguration.main(args); |
| } |
| |
| private synchronized boolean add(MonitorAction... actions) |
| { |
| boolean result = true; |
| |
| for (MonitorAction action : actions) |
| { |
| if (!_actions.add(action)) |
| { |
| result = false; |
| } |
| else |
| { |
| MonitorTask.schedule(action); |
| } |
| } |
| |
| return result; |
| } |
| |
| private synchronized boolean remove(MonitorAction... actions) |
| { |
| boolean result = true; |
| |
| for (MonitorAction action : actions) |
| { |
| if (!_actions.remove(action)) |
| { |
| result = false; |
| } |
| |
| MonitorTask.cancel(action); |
| } |
| |
| return result; |
| } |
| |
| private synchronized void set(String url) |
| { |
| _serverUrl = url; |
| |
| if (_serviceConnection != null) |
| { |
| _serviceConnection.disconnect(); |
| _serviceConnection = null; |
| } |
| } |
| |
| private synchronized MBeanServerConnection get() |
| throws IOException |
| { |
| if (_serviceConnection == null) |
| { |
| _serviceConnection = new ServiceConnection(_serverUrl); |
| _serviceConnection.connect(); |
| } |
| |
| return _serviceConnection.getConnection(); |
| } |
| } |